UNITED STATES DEPARTMENT OF AGRICULTURE 

Rural Utilities Service 

BULLETIN 1728F-810 

SUBJECT: Electric Transmission Specifications and Drawings,

 34.5 kV Through 69 kV

Incorporated by reference in 7 CFR Part 1728 

TO: All Electric Borrowers 

 RUS Electric Staff 

EFFECTIVE DATE: Date Of Approval 

EXPIRATION DATE: Not applicable. Incorporated by reference in 

7 CFR 1728. 

OFFICE OF PRIMARY INTEREST: Transmission Branch, Electric Staff 

Division 

PREVIOUS INSTRUCTIONS: This bulletin replaces Bulletin 50-2, 

Electric Transmission Specifications and Drawings, 34.5 kV 

Through 69 kV, issued October 12, 1988. 

FILING INSTRUCTIONS: Discard Bulletin 50-2 dated October 12, 

1988, and replace with this bulletin. File with 7 CFR part 1728. 

PURPOSE: To provide general construction requirements for 

representative wood pole structures and assemblies for 34.5 

through 69 kV transmission lines. 

/S/ Blaine Stockton April 9, 1999

Assistant Administrator Date 

Electric Program 

Bulletin 1728F-810 

Page i 

TABLE OF CONTENTS

Description Page

Introduction - General.......................................... iii-iv 

Introduction - Specific Instructions............................ v-viii 

Technical Specifications 

 General....................................................... 1-1 

 Clearing...................................................... 2-1 

 Access........................................................ 3-1 

 Wood Poles.................................................... 4-1 

 Pole Top Assemblies........................................... 5-1 

 Structure Assembly............................................ 6-1 

 Structure Erection............................................ 7-1 

 Guys and Anchors.............................................. 8-1 

 Grounding & Bonding........................................... 9-1 

 Insulators & Hardware......................................... 10-1 

 Conductors & Overhead Ground Wire............................. 11-1 

 Drawings...................................................... 12-1 

Structure Drawings............................................... 1 

Assemblies and Construction Units................................ 45 

Construction Details............................................. 89 

Crossarm Drilling Details........................................ 96 

Pole Framing Details............................................. 102 

Guying Guides.................................................... 107 

Appendices 

 Index to Construction Drawings by Description................. A-1 

 Index to Construction Drawings by Designation................. B-1 

Selected SI - Metric Conversions................................. C-1 

ABBREVIATIONS 

ANSI American National Standards Institute 

CFR Code of Federal Regulations 

FAA Federal Aviation Administration 

IEEE Institute of Electrical and Electronics Engineers 

NESC National Electrical Safety Code 

OHGW Overhead Ground Wire 

RUS Rural Utilities Service 
Bulletin 1728F-810 

Page ii 

Blank Page
Bulletin 1728F-810 

Page iii 

INTRODUCTION - GENERAL 

Purpose: These specifications and drawings provide general minimum 

requirements for constructing standard wood pole structures and 

assemblies for 34.5 kV through 69 kV transmission lines. 

The borrower or borrower's representative is responsible for preparing 

a complete construction contract consisting of the construction 

contract form (RUS Form 830 or 831) and all applicable specifications, 

plans, and drawings to construct a specific transmission line project. 

RUS borrowers are required to construct projects that meet the minimum 

requirements of their loan documents and all applicable RUS 

regulations. The requirements set forth in this bulletin implement 

provisions of the standard form of loan documents between RUS and its 

electric borrowers and RUS regulations. The loan documents require 

RUS borrowers to construct electric facilities in accordance with RUS 

approved plans and specifications. 

Scope: The specification for construction covers right-of-way 

clearing and access, wood poles, pole top assemblies, structure 

assembly and structure erection, guys and anchors, grounding and 

bonding, insulators and hardware, and phase conductors and overhead 

ground wires. 

The drawings provided in this specification include wood pole 

structures, guying attachments, miscellaneous assemblies, foundation 

units, guying assembly units, and anchor units. These drawings apply 

to usual construction needs and conditions. Borrowers may need to 

develop drawings which address specific unusual construction 

conditions. 

Preparation Of The Construction Contract: This bulletin does not set 

forth all the terms and conditions that are necessary for a specific 

construction contract. This bulletin sets forth the minimum 

specifications and drawings for standard wood pole structures and 

assemblies for 34.5 kV through 69 kV transmission lines. 

When preparing a complete construction contract, the borrower or 

borrower’s representative should remove sheets i to viii of this 

bulletin and add to Part I and Part II of this bulletin, the 

following: 

 -RUS Form 830, Electric System Construction Contract, or 

 RUS Form 831, Electric Transmission Construction Contract 

 -General Conditions 

 -Plans Including Maps and Special Drawings 

 -Plan-and-Profile Drawings 

RUS Forms 830 and 831 cover "Notice and Instructions to Bidders," 

"Contractor’s Proposal," "Transmission Construction Units and Prices," 

"Acceptance," and "Contractor’s Bond." All appropriate blanks and 

selections in the RUS contract must be completed by the borrower. 
Bulletin 1728F-810 

Page iv 

The RUS borrower or the borrower’s representative is responsible for 

setting forth and including in sufficient detail the construction RUS 

specifications and drawings. In the preparation of Part I, 

Specifications, and Part II, Drawings, the borrower or borrower’s 

representative is responsible for assuring that the RUS approved 

specifications and drawings for a transmission line project are set 

forth in sufficient detail in the construction contract and that the 

completed construction project complies with the contract. RUS 

construction specifications have been arranged so that they may be 

expanded to include any specific borrower requirements or they may be 

reduced to exclude any sections that are not necessary (such as 

clearing, etc.,) if the work will not be included in the contract. 
Bulletin 1728F-810 

Page v 

INTRODUCTION - SPECIFIC INSTRUCTIONS 

A construction contract with detailed construction specifications and 

drawings must be prepared before requesting bids. Preparation of the 

construction specification and drawings is discussed below: 

1. Construction Specification: The following is a checklist of pages 

in this specification where there are certain specific options 

available to the borrower and also specified areas where 

additional information can be added to meet special circumstances 

relating to the project: 

a. Page 1-1, Paragraph 1.2 

b. Page 3-1, Paragraph 3.1.2 - check one 

c. Page 4-2, Paragraphs 4.2.3 and 4.2.4 - check one 

d. Page 11-2, Paragraph 11.4.2 - check one 

e. Page 11-2, Paragraph 11.5.1 - complete when appropriate 

f. Page 12-1, Index of Drawings - complete 

g. Special Requirement Sections - if there are no special 

requirements, indicate "none" 

2. Drawings: 

a. Structural Material List: All items that are blank in the 

"List of Materials" for each structure drawing must be 

completed. Drawing TE-1 gives guidance to the selection of 

assemblies which may be specified by the borrower or 

borrower’s representative in the material list. Descriptions 

of these assemblies are as follows: 

(1) Cushioned suspension assemblies or bolted clamp 

assemblies for the conductor or overhead ground wire 

(2) Single or double bolt overhead ground wire support 

brackets 

(3) Guy attachments 

(4) Angle bracket and guy attachments 

(5) Overhead guy assemblies 

b. Guying Guide Drawings: A guying guide for angle and deadend 

structures should show the centerline offset dimension for 

each structure; the type, quantity, and location for all guy 

assemblies and anchor installations, and pole-to-pole spacing 

if other than that given on the structure drawings. 

c. Pole Framing Drawings: Appropriate pole framing drawings 

should be included. For structures with crossbraces, the 

location of the top mounting holes for the crossbrace should 

be clearly dimensioned on the pole framing drawings. 

d. Crossarm Drilling Drawings: Any crossarm drilling drawings 

not covered in this bulletin should be added. 

3. Miscellaneous Information
Bulletin 1728F-810 

Page vi 

a. Insulator Information: The following tables provide the 

nominal insulator string lengths. The exact length required 

is to be shown on drawings TM-1 and TM-2 and will reflect 

actual dimensions of hardware, suspension clamp, and deadend 

clamps specified. 

Table 1 

Lengths of Insulator Strings for TM-1 

Voltage No. Tangent No. Angle No. Deadends 

Class Units TM-1A TM-1B Units TM-1C Units TM-1D or 1E

 

34.5 kV 3 2'-0" 2'-1" 4 2'-11" 4 2'-9" 

46 kV 3 2'-0" 2'-1" 4 2'-11" 5 3'-4" 

69 kV 4 2'-6" 2'-7" 5 3'-5" 6 3'-10" 

 

Table 2 

Lengths of Insulator Strings for TM-2

 

Voltage No. Tangent No. Angle, TM-2C No. 

Class Units TM-2A TM-2B Units Type 1 Type 2 Type 3 Units TM-1D or 1E

 

34.5 kV 3 2’-2” 2’-3” 4 3’-1” * * 4 2’-9” 

46 kV 3 2’-2” 2’-3” 4 3’-1” * * 5 3’-4” 

69 kV 4 2’-8” 2’-9” 5 3’-7” * * 6 3’-10” 

 

*Not available. 

The borrower or borrower's representative is responsible for 

ensuring that required proper clearances between insulator 

strings and guy wires and structures are maintained for the 

actual insulator string lengths. For certain angle 

structures, recommended pole-to-pole spacings are provided on 

the structure drawings based on insulator string lengths using 

bolted clamps. 

b. Structure Strength: The borrower or borrower's representative 

is responsible for ensuring that the design strength of each 

structure will be adequate. Included are poles, crossarms, 

bolts, braces, insulators, and connections. 

c. Drawing TE-1: This drawing is a checklist which includes the 

subassembly alternatives which the borrower needs to specify 

on the structure drawings. 
Bulletin 1728F-810 

Page vii 

PART I 

SPECIFICATIONS

Bulletin 1728F-810 

Page 1-1 

1. GENERAL 

1.1 Standard of Work and Schedules

1.1.1 All work must be performed in a thorough and proficient 

manner in accordance with the plans, specifications, and 

construction drawings. 

1.1.2 In accordance with the requirements of 7 CFR 1724, 

Subpart E, Electric System Design, the latest edition of the

National Electrical Safety Code (NESC), American National 

Standards Institute (ANSI) C2, must be followed wherever 

applicable to the work, except where local regulations or 

specification requirements are more stringent, in which case the 

more stringent requirements must govern. The NESC may be 

obtained from the Institute of Electrical and Electronics 

Engineers, Inc., 445 Hoes Lane, P.O. Box 1331, Piscataway, N.J., 

08855-1331, USA. 

1.2 Technical Specifications: The following sections form the 

technical specifications (engineer to complete): 

General __________________________ 

___________________________ __________________________ 

___________________________ __________________________ 

___________________________ __________________________ 

___________________________ __________________________ 

___________________________ __________________________ 

1.3 Drawing and Maps

1.3.1 All drawings and maps accompanying this specification or 

listed herein must be considered a part of these plans and 

specifications. The specific drawings included as part of this 

technical specification are listed and indexed in section 12, 

Drawings. 

1.3.2 If the drawings specify a requirement different from the 

worded specifications, the specifications must govern. 

1.4 Locations of Structures and Appurtenances: Structures, 

anchors, access roads, and other major items to be constructed 

must be placed in locations determined and staked by the engineer 

and as shown on the plan and profile drawings. The contractor is 

responsible for verifying the location of structures and 

appurtenances to be installed. 

1.5 Safety
Bulletin 1728F-810 

Page 1-2 

1.5.1 The work must be performed in accordance with all 

applicable Federal, State, and local safety laws and regulations. 

1.5.2 The contractor shall be responsible for the observance of 

proper safety practices and the avoidance of damage to property 

by all personnel engaged in the work. 

1.5.3 The contractor shall take all steps necessary to prevent 

damage to or interference with existing power lines, 

communication facilities, roadways, railroads, waterways, buried 

cables, pipelines, and other facilities adjacent to or crossing 

the project right-of-way. 

1.5.4 The contractor shall develop and maintain for the duration 

of this contract a safety program which will provide for 

compliance with applicable provisions of the National Electrical 

Safety Code and Federal, State, and local safety laws and 

regulations. The contractor shall designate a qualified employee 

to supervise the safety program and ensure compliance with 

applicable safety laws and regulations. 

1.5.5 Structures and Conductors in the Vicinity of Airports or 

Exceeding 200 Feet in Height - In cases where structures or 

conductors will exceed a height of 200 feet, or are within 20,000 

feet of an airport, the nearest regional or area office of the 

FAA must be contacted and if required, FAA Form 7460-1, "Notice 

of Proposed Construction or Alteration," is to be filed. 

1.6 Definitions 

1.6.1 Construction unit means a specifically defined portion of 

a construction project containing materials, labor, or both for 

purposes of bidding and payment. 

1.6.2 Contractor means a person or firm furnishing materials or 

performing construction at a specified price. 

l.6.3 Engineer means a registered or licensed person employed by 

the borrower to provide engineering services for a project and 

duly authorized assistants and representatives. 

1.6.4 Owner-furnished materials means materials or equipment or 

both supplied by the borrower for installation by the contractor. 
Bulletin 1728F-810 

Page 1-3 

1.7 Abbreviations

 ANSI American National Standards Institute 

 CFR Code of Federal Regulations 

 FAA Federal Aviation Administration 

 IEEE Institute of Electrical and Electronics Engineers 

 NESC National Electrical Safety Code 

 OHGW Overhead Ground Wire 

 RUS Rural Utilities Service 

1.8 Special Requirements (to be completed by the engineer):
Bulletin 1728F-810 

Page 1-4 
Bulletin 1728F-810 

Page 2-1 

2. CLEARING 

2.1 General Requirements

2.1.1 Clearing units specified may cover full width right-of-way 

clearing, selective clearing, treetopping, spraying of 

herbicides, or other forms of right-of-way preparation. Only 

those areas shown on the drawings or specified by the engineer 

shall be cleared in accordance with the applicable clearing 

units. Isolated ("danger") trees to be removed will be marked in 

the field by the engineer. 

2.1.2 Only such vegetation should only be removed as necessary 

to permit construction, operation, and maintenance of the 

transmission line. Care must be taken to prevent denuding of 

ground cover and erosion of the soil. 

2.2 Clearing Methods and Equipment

2.2.1 Unless otherwise specified, all timber to be cleared must 

be felled. The removal of brush must be in a manner so as to 

reduce the overall impact on the root structure of the ground 

cover. 

2.2.2 Equipment must be in good repair and appropriate for the 

types of clearing specified. 

2.2.3 When specified in the right-of-way construction units, 

stumps left in place must be treated with a heavy application of 

an appropriate herbicide approved by the engineer. Chemical 

treatment of stumps must occur as soon as possible after cutting. 

The chemical application must be sufficient to saturate the 

entire aboveground surface of the stump and cause a small amount 

to run down the sides and collect at the base to penetrate below 

the ground line into the roots. Any stumps showing resurgent 

growth prior to completion of line construction must be treated 

to kill all such growth. 

2.2.4 Chemical sprays or herbicides must only be used with the 

approval of the engineer, and only in areas so designated for 

their use. Herbicides must be applied in accordance with the 

manufacturer's recommendations and only by a licensed/certified 

applicator. The chemical sprays and herbicides must meet the 

environmental requirements of all governing agencies. Spraying 

must be performed in such manner, at such pressure, and under 

such wind conditions that drift of spray material to adjacent 

plants, animals, or persons will be avoided. 

Such application must not be made: a) when the ground is 

continuously frozen; b) adjacent to streams or other water 

bodies; c) when the ground is or may be flooded during the period 

in which the herbicide retains its toxicity; or d) in a marsh or 

other wetland. 
Bulletin 1728F-810 

Page 2-2 

2.2.5 If required by the "Special Requirements" paragraph below, 

stumps must be removed. 

2.2.6 The landowner's written permission must be received prior 

to cutting trees outside the right-of-way. 

2.2.7 Disposal of trees, brush, branches, and refuse must be in 

accordance with the methods specified in the construction units. 

2.2.8 Avoid clearing vegetation in riparian areas to the extent 

possible. A vegetative buffer zone should be left along creeks 

and streams to minimize siltation and sedimentation and prevent 

adverse impacts to riparian habitat. 

2.3 Special Requirements (to be completed by the engineer): 
Bulletin 1728F-810 

Page 3-1 

3. ACCESS 

3.1 Ingress And Egress

3.1.1 The activities of the contractor are to be restricted to 

along the right-of-way. 

3.1.2 Where access to the right-of-way is across private 

property, the owner, tenant, or occupant shall be contacted to 

obtain permission for ingress and egress to the right-of-way. 

Such arrangements, including obtaining releases for damage, must 

be made by (engineer to check one): 

 a. The borrower or engineer .........

 b. The contractor ...................

 c. Other (specify) ..................

3.1.3 Access across public land must be accomplished as 

described in Access, Section 3.6, "Special Requirements." 

3.2 Fences and Gates

3.2.1 Where fences must be cut to allow access for the work, 

gates must be installed as shown on the drawings or as directed 

by the engineer. All material and labor required for such 

installations must be furnished by the contractor per bid unit. 

3.2.2 Types and details of gate construction must be shown on 

the drawings or approved by the engineer. 

3.2.3 Brace posts must be installed at each fence cut to insure 

that adjacent fence spans will not become slack. A wire fence 

must not be cut until it is secured to the brace post. 

3.2.4 All gates must be closed and locked when required by the 

landowner. 

3.2.5 Gate units may include removal of the gate after 

construction of the line is complete. In those cases as 

determined by the engineer, the contractor shall remove the gate 

and restore the fence. All labor and material required must be 

furnished by the contractor. If removal is required, gate 

material must be disposed of in a manner acceptable to the 

engineer. 

3.3 Access Roads

3.3.1 Access road construction may be required as a part of the 

work. Where specified, roads must be of the type, dimensions, 

and grades shown on the drawings, and must be located as shown on 

the drawings and as staked by the engineer. 
Bulletin 1728F-810 

Page 3-2 

3.3.2 Borrowed material for access road fill must be a 

compactible granular material suitable for such a purpose, free 

of brush, refuse, or organic material. Fill must be compacted by 

the use of suitable heavy construction equipment. The finished 

road must be maintained smooth and free of ruts and sink holes 

until completion of construction. Water bars, drainage ditches, 

or other special requirements as called for on the drawings must 

be installed in accordance with the plans and specifications. 

All materials and labor required for such work must be furnished 

by the contractor. 

3.4 Culverts: Culvert pipes must be installed as shown on the 

drawings or as directed by the engineer. Each pipe must be of a 

type, diameter, and length as specified and must be properly set, 

backfilled, and tamped. All labor and material required must be 

provided by the contractor. 

3.5 Restoration: The contractor shall have a continuous cleanup 

program throughout construction. The contractor shall restore 

the land that is crossed to its original condition. This 

restoration includes the removal of deep ruts and the disposal of 

foreign objects such as stumps or chunks of concrete. It also 

includes smoothing and reseeding damaged vegetation areas with 

vegetation similar to the original, cleaning out gullies, and 

restoring terraces. Roads existing prior to construction must be 

restored to equal or better than their original condition. 

3.6 Special Requirements (to be completed by the engineer): 
Bulletin 1728F-810 

Page 4-1 

4. WOOD POLES 

4.1 Pole Inspection, Handling, and Distribution

4.1.1 The contractor shall immediately notify the engineer of 

freight damage or misfabrication of poles. The framing, boring, 

and gaining, if required, must agree with the Pole Framing 

Details for the specific structures to be erected. 

4.1.2 The pole lengths and classes must agree with the Pole 

Units specified for the structures to be erected, as tabulated in 

the Transmission Construction Units and shown on the plan and 

profile drawings. 

4.1.3 Poles must be handled with care so as not to damage the 

wood or preservative treatment. Poles must be lifted off of the 

pole hauler at designated structure locations. They must not be 

rolled or dragged along the ground. Lifting slings must be used 

and must be fabricated from a material that protects the wood 

from damage. Pole tongs are not permitted when handling poles. 

4.1.4 If poles are stored after delivery, they must be carefully 

arranged and placed on wide blocking to prevent crushing. Poles 

must not come in contact with standing water or the ground. No 

pole will have an unsupported length greater than 20 feet. The 

blocking must be provided by the contractor and included in this 

unit price. 

4.1.5 The contractor shall distribute extra heavy, choice, 

close-grained poles to angle, deadend, and crossing structures. 

4.1.6 When ungained poles and adjustable spacer fittings are 

specified for multipole structures, the contractor shall match 

the poles as directed by the engineer. 

4.2 Field Drilling and Treating

4.2.1 All field drilled holes must be thoroughly treated with a 

heavy application of preservative compound approved by the 

engineer. The contractor shall include any required field 

drilling and treating in the unit cost for pole top assemblies. 

4.2.2 Unused holes or holes that are misdrilled must be plugged 

prior to erection using treated wood dowel pins 3 inches in 

length. When a hole is misdrilled, the engineer shall be 

notified. A pole will be rejected by the engineer if two or more 

misdrilled holes occur at a connection. If a pole is rejected 

due to misdrilling of holes by the contractor, the contractor 

shall replace the damaged pole at no additional cost to the 

borrower. 

4.2.3 Double crossarm spacer fittings, if required, are 

indicated in the List of Materials on the transmission line 
Bulletin 1728F-810 

Page 4-2 

structure drawings. Fixed spacers must be used with factory 

gained and treated poles. Adjustable spacers must be used with 

ungained and treated poles. The gaining of poles, and the type 

of crossarm spacers are as follows (engineer to check one): 

 a. Factory gained and treated poles for fixed 

 spacer fittings ................................... 

 b. Ungained and treated poles for adjustable 

 spacer fittings ................................... 

 c. Gained and treated poles for adjustable 

 spacer fittings ................................... 

 d. Structure with double crossarms are not required... 

4.2.4 Poles may be supplied with flat or 15 degree sloping roofs. 

Tops of poles must not be cut except with the expressed approval 

of the borrower. If cutting is deemed necessary, the pole top 

must be cut off at a slope of 15 degrees, thoroughly treated with 

preservative approved by the engineer, and covered with a mastic 

type cap. Poles are to be supplied with (engineer to check one): 

 a. Flat roofs ........................................ 

 b. 15 degree sloping roofs ........................... 

 c. Contractor's option ............................... 

4.2.5 The butt of any pole is not to be cut under any 

circumstances. 

4.3 Special Requirements (to be completed by the engineer) 
Bulletin 1728F-810 

Page 5-1 

5. POLE TOP ASSEMBLIES 

 

5.1 Reference to Drawings

5.1.1 The pole top assembly unit consists of all items shown in 

the List of Materials on the transmission line structure 

drawings. If spacers for double crossarms are required, the type 

of spacer must be as noted in Wood Poles, section 4.2.3. 

5.1.2 Unless shown in the List of Materials, the pole top 

assembly unit does not include other units such as pole units, 

pole grounding units, foundation units, guying assembly units, 

and anchor units. 

5.2 Handling of Materials

5.2.1 Care must be exercised in the handling of all materials. 

Defective or damaged material must not be installed. 

5.2.2 Equipment to load and haul to the job site. All ownerfurnished material must be provided. The contractor shall bear 

the cost of all handling, such as loading, hauling, and 

unloading. 

5.2.3 If framing members (crossarms, bracing, and X-braces) are 

stored after delivery, they must be arranged with care and placed 

on blocking at least 1 foot above ground to prevent contact with 

standing water or the ground. Crossarms must not have an 

unsupported length greater than 20 feet. The blocking must be 

provided by the contractor and included in the contract's unit 

prices. 

5.2.4 Care must be exercised in handling crossarm assemblies, 

pole band assemblies, and other factory subassemblies to prevent 

loss of components for which the contractor is responsible. 

5.2.5 Materials or equipment must not be placed where it will be 

damaged by or cause damage to vehicular traffic, livestock, 

persons, and property. 

5.3 Special Requirements (to be completed by the engineer): 

Bulletin 1728F-810 

Page 6-1 

6. STRUCTURE ASSEMBLY

6.1 Reference to Drawings

6.1.1 The contractor shall assemble each structure using the 

assemblies designated on the plan-and-profile drawings and as 

shown on the structure and assembly drawings. 

6.1.2 Connection details to assemble each structure are 

referenced on the structure drawings and included with the plans 

and specifications. 

6.2 Structure Framing

6.2.1 The contractor shall frame structures on flat or uniformly 

sloping terrain located at or near the structure site. Framing 

on rolling terrain where poles become unsupported should be 

avoided. If assembly on uniform terrain is not possible, the 

contractor shall temporarily support the structure components to 

prevent racking during assembly. 

6.2.2 All grid gain teeth must be fully embedded into the wood 

surface to meet the approval of the engineer. Grid gains must be 

seated by a combination of tightening assembly bolts and 

hammering on wood blocking. 

6.2.3 All hardware at a connection must be compatible with the 

fastener diameter. The holes in the hardware must be 1/16 of an 

inch greater than the fastener diameter, unless otherwise noted. 

The quantity of square nuts required for a fastener must conform 

(unless otherwise noted in the List of Materials on the 

transmission line structure drawings) to ANSI C135.1, Galvanized 

Steel Bolts and Nuts. 

6.2.4 Fasteners must be sized so that they extend not less than 

1/2 of an inch nor more than 2-1/2 inches beyond the face of the 

last nut or locknut. Galvanized bolts must not be cut off unless 

the engineer allows it for special requirements. Where bolts are 

not of proper length due to variations in the material, the 

contractor shall replace the fasteners with ones of proper length 

at no cost to the borrower. 

6.2.5 Spring washers must be installed where specified. The 

curved portion of the spring washer must be installed 

horizontally to facilitate inspection of wood shrinkage in the 

future. 

6.2.6 Double crossarms, when installed, must not bow by more 

than plus or minus 1/2 of an inch per arm. The contractor shall 

replace spacer fittings, where required, to meet this 

specification. The additional cost to replace spacers to meet 

this tolerance must be included in the contractor's unit costs 
Bulletin 1728F-810 

Page 6-2 

for pole top assemblies. Field gaining of poles will not be 

acceptable. 

6.2.7 Pole bands must be sized for the poles upon which they are 

to be mounted and must fit securely on the poles. Pole bands 

must be securely tightened around the pole with even spacing 

between vangs. Where pole bands are not of proper size due to 

variations in the wood, the contractor shall replace the bands, 

where required, to met this specification. The additional cost 

to replace bands must be included in the contractor's unit costs 

for pole top assemblies. 

6.2.8 Pole ground wires must be installed when specified on the 

plan-and-profile drawings. The downlead must be sufficiently 

tightened and routed as shown on the respective structure 

drawings and described on drawing TM-9. 

6.2.9 Where X-braces are specified, the lower holes through the 

pole must be field drilled. These holes must pass through the 

center of the pole, and must be thoroughly treated with 

preservative compound approved by the engineer. The heads of 

machine bolts for mounting the X-braces must be toward the center 

of the structure. 

6.2.10 Guying attachments, where specified, must be oriented as 

shown on the transmission line structure drawings and as shown on 

the guying attachment drawings. Pole bands must be installed 

complete with through bolts, links, grounding clips, and all 

items indicated on the manufacturer's drawings. 

6.2.11 The contractor shall check the end fittings of crossarms, 

braces, X-braces, and other factory assembled components to see 

that all factory-installed hardware is secured properly. The 

cost of retightening factory-installed hardware, if required, 

must be included in the contractor's unit cost for pole top 

assemblies. 

6.2.12 Assembled structures must be prepared for erection with 

all items shown in the List of Materials such as conductor 

assemblies, OHGW assemblies, X-brace assemblies, pole tie 

assemblies, guying attachments, guying assemblies, and pole 

ground assemblies. 

6.3 Special Requirements (to be completed by the engineer): 
Bulletin 1728F-810 

Page 7-1 

7. STRUCTURE ERECTION 

7.1 Reference to Drawings

7.1.1 The contractor shall check structure locations prior to 

erecting structures. Structures and specified assemblies must be 

erected at locations shown on the plan-and-profile drawings. 

7.1.2 Tangent structures must be erected as shown on the 

transmission line structure drawings. The poles or center of Hframes must be placed on the survey centerlines, unless offset 

left or right of the survey centerlines by the dimension shown on 

the guying guide drawings or plan-and-profile drawings. 

7.1.3 Angle structures and deadend structures must be erected as 

shown on the structure drawings, guying guide drawings, and planand-profile drawings. Angle structures must be placed so that 

all poles are set on a line perpendicular to the bisector of the 

line angle. The angle structure must be offset to the left or 

right of the survey centerline so that all poles are offset by 

the dimension shown on the guying guide or plan-and-profile 

drawings. 

For deadend structures in which the line angle is 0 degrees, the 

structures must be placed perpendicular to the survey centerline. 

7.2 Structure Erection

7.2.1 Tangent structures with single crossarms must be erected 

with crossarms on alternating sides of the poles. At unusually 

long spans, the poles must be set so that the crossarms are on 

the side of the pole away from the long span. At crossings, 

single crossarms should be attached to the face of the structure 

away from the crossing. 

7.2.2 Care must be taken not to overstress any members or 

connections when installing structures. 

7.2.3 Hardware, bolts, nuts, locknuts, and spring washers must 

be tight after erection of the structures. 

7.3 Excavation, Setting, and Backfill

7.3.1 Unless otherwise indicated, all poles must be embedded in 

soil to a minimum depth of 10 percent of the pole length plus 

2 feet and not to exceed 3 inches deeper. Where the ground is 

sloping, the embedded depth of multiple pole structures with 

equal pole sizes must be measured on the side of the structure 

where the ground is lower. (On the high side, greater depth is 

needed for the purpose of leveling the crossarms.) For multiple 
Bulletin 1728F-810 

Page 7-2 

pole structures with unequal size poles, poles must be overburied 

to get the correct ground to phase height. 

7.3.2 Pole holes must be a minimum of 8 inches wider than the 

butt diameter of the pole. When pole bearing plates are used, 

pole holes must be the minimum diameter necessary for 

installation of the pole. The excavated hole must be at least as 

large at the bottom as at the top. 

7.3.3 Accumulated water must be removed from the hole prior to 

setting the pole. Any soil added to level the bottom of the 

holes must be tamped before the pole is set in the hole. 

7.3.4 Pole backfill material must be compactible and suitable 

for providing a dense supportive soil mass, free of voids, not 

frozen, and must be approved by the engineer. Where native soil 

is not suitable for backfill, the contractor shall furnish 

suitable granular imported material for this purpose which must 

be paid for at the unit price for granular backfill for poles. 

7.3.5 Poles must be set plumb before the backfill is placed; and 

after placing the backfill, the poles must remain plumb. If the 

poles are out of plumb, the backfill must be removed and 

replaced. Plumbing of poles by pushing or pulling the structure 

must not be permitted. 

7.3.6 Backfill must be placed around the pole in layers not 

exceeding 6 inches in depth, with each layer mechanically tamped 

before the next layer is added. The backfill must be compacted 

to a density equal to or greater than that of the surrounding 

undisturbed soil. 

7.3.7 Backfilling and compaction must be done at a rate no 

faster than one laborer shoveling fill and two others using 

mechanical or pneumatic tampers. 

7.3.8 Native soil must be banked up and tamped around the pole 

to a height of 6 inches above the natural grade, and must be 

sloped away from the pole. 

7.3.9 After completion of wire stringing, all poles must be 

reinspected to check that poles remain plumb and the backfill has 

not settled. The backfill must be retamped at any pole location 

where the backfill shows settlement or movement. If required by 

the engineer, the backfill must be completely dug out, the pole 

readjusted if necessary, and the backfill retamped. This work 

must be done at no additional cost to borrower. 

7.3.10 When approved by the engineer, surplus excavated soil may 

be carefully spread and leveled on the surface of the ground near 

the structure and in a manner to minimize damage to the grass 

areas or other foliage. 
Bulletin 1728F-810 

Page 7-3 

7.4 Special Requirements (to be completed by the engineer): 
Bulletin 1728F-810 

Page 7-4 
Bulletin 1728F-810 

Page 8-1 

8. GUYS AND ANCHORS 

8.1 Reference to Drawings: Guys and anchors must be installed 

at locations shown on the drawings or specified by the engineer. 

Anchor rod locations must be staked by the engineer. The 

contractor shall check locations of anchors before installation. 

8.2 General Installation Requirements

8.2.1 Anchor rods must be installed in line with the guy wire 

and installed so that not more than 8 inches of rod (including 

eye) remain out of the ground after guy tension is applied. In 

cultivated fields or other locations deemed necessary, the 

projection of the anchor rod above earth may be increased to a 

maximum 12 inches to prevent burial of the rod eye. 

8.2.2 Anchors must be of the type, size, and depth as shown on 

the drawings. 

8.2.3 Anchors placed in a hole must be approved by the engineer 

in writing before the anchor hole is backfilled. The holes must 

be backfilled and tamped in the same manner as is required for 

wood pole backfilling. Only suitable native soil or approved 

imported granular material must be used for anchor backfill. 

8.2.4 Where required by the engineer, anchors must be tested to 

50 percent of their designated ultimate rated capacity. All 

material and labor required for testing of the anchors must be 

furnished by the contractor and included in the unit costs for 

testing anchors. 

8.2.5 Power installed screw anchors must be installed with the 

appropriate size and type of equipment in accordance with the 

engineer's requirements and manufacturer's recommendations. 

Screw anchors must not be reversed to meet the requirements of 

project of the rods above the ground. All installations must be 

witnessed by the borrower's representative. 

8.2.6 Guys must be installed and attached to the structures as 

shown on the transmission line structure drawings before 

conductors or overhead ground wires are strung. Each guy must be 

pretensioned to remove any slack in the guy. Guys must be 

retensioned after the conductors and overhead ground wires are 

installed to plumb the poles and to equalize tensions in the 

guys. If slack guys are found, they must be readjusted so that 

all guys in any structure have approximately equal tension. The 

final tension in the guys and the plumb of the poles must meet 

the approval of the engineer. 

8.3 Special Requirements (to be completed by the engineer): 

Bulletin 1728F-810 

Page 9-1 

9. GROUNDING AND BONDING 

9.1 Reference to Drawings: All structures must be grounded as 

shown on the plan-and-profile drawings and transmission line 

structure drawings, and subject to the following provisions. 

9.2 Structure Grounding

9.2.1 The engineer may require that ground resistance 

measurements be made for each structure and that additional 

grounding be added to that already provided by the basic 

structure grounding assemblies. 

9.2.2 Where structure grounding tests are required by the 

engineer, the contractor shall measure the ground resistance 

after the structure is erected, but before the overhead ground 

wire is installed. The method of measuring ground resistance 

must be subject to the approval of the engineer. 

9.2.3 All labor and materials for ground resistance measurements 

and installation of additional grounding must be provided by the 

contractor and must be covered by the unit costs for testing and 

for grounding units. 

9.2.4 The contractor shall install counterpoise only after 

approval of the engineer. 

9.3 Bonding of Ground Wire

9.3.1 The pole ground wire must be continuous and not spliced 

from top of pole to the pole butt grounding assembly. Should 

damage occur during erection of the structure, the pole ground 

wire may be spliced with the engineer's approval. 

9.3.2 Hardware must be bonded to the pole ground wire as shown 

on the drawings. The ground wire must clear any unbonded 

hardware by at least 3 inches. 

9.4 Fence and Gate Grounding: Fence and gate grounds must be 

installed as shown on the drawings. All labor and material 

required must be furnished by the contractor at the unit prices 

for fence and gate grounding. 

9.5 Special Requirements (to be completed by the engineer): 
Bulletin 1728F-810 

Page 9-2 
Bulletin 1728F-810 

Page 10-1 

10. INSULATORS AND HARDWARE 

10.1 Reference to Drawings: Insulator and hardware assemblies 

must be fully assembled and installed as shown on the drawings. 

Items of hardware and insulators must be inspected for missing 

parts, defects, and proper fit before installation. Defective or 

missing pieces must be replaced. 

10.2 Handling and Storage

10.2.1 Insulators and hardware must be stored in their 

appropriate shipping containers until installation. They must be 

properly supported and stacked so as not to damage the individual 

items. They must be blocked up off the ground so that they 

cannot come in contact with the ground or standing water. 

10.2.2 Insulators must be carefully handled to prevent damage to 

the porcelain skirts, pins, galvanizing, and cotter keys. A 

cradle or other suitable device must be used to hoist all 

insulator strings whenever the quantity exceeds 6 units per 

string. 

10.2.3 Insulators that are cracked, chipped, or damaged in any 

way must be replaced with units that are not defective. The cost 

for replacement of previously accepted units must be borne by the 

contractor. 

10.2.4 All insulators must be wiped clean with a clean, soft, 

nonabrasive cloth. 

10.3 Installation

10.3.1 All connections must be made in accordance with the 

drawings. Bolts must be torqued to the manufacturer's 

specifications. Cotter keys, where required, must be fully 

inserted. 

10.3.2 Cotter key eyes on insulators and hardware items must be

oriented toward the structure, or in such a way as to facilitate 

easy removal during hot line maintenance. 

10.3.3 Pins and bolts to insulator string assemblies must be 

oriented with the head upright wherever possible. 

10.3.4 Pin-type insulators must be tight on the pins. On 

tangent structures, the top groove must be in line with the 

conductor after tying in. 

10.4 Special Requirements (to be completed by the engineer):
Bulletin 1728F-810 

Page 10-2 
Bulletin 1728F-810 

Page A11. CONDUCTORS AND OVERHEAD GROUND WIRES 

11.1 General

11.1.1 All conductor and overhead ground wire installation work 

must be done in accordance with the manufacturer's 

recommendations and the IEEE Standard 524, Guide to the 

Installation of Overhead Transmission Line Conductors. If there 

is a discrepancy between the guide and the manufacturer's 

recommendation, the contractor should follow the manufacturer's 

recommendation. The following provisions are for tension 

stringing of conductors and overhead ground wires. IEEE Standard 

524 may be obtained from the Institute of Electrical and 

Electronics Engineers, 445 Hoes Lane, P.O. Box 1331, Piscataway, 

N.J., 08855-1331, USA. 

11.1.2 It is very important to avoid damaging the wire or the 

associated fittings in any way. It is the contractor's 

responsibility to protect the wire and fittings against damage. 

If the wire and associated materials are damaged due to the 

contractor's mishandling, negligence, or faulty equipment, the 

contractor shall repair or replace the damaged sections, 

including furnishing of necessary materials, in a manner 

satisfactory to the engineer and at no additional cost to the 

borrower. 

11.2. Handling and Storage

11.2.1 Reels of wire must be stored off the ground and 

adequately supported so as to avoid damage to the reel, 

protective covering, and wire. Wire and reels must be kept free 

of standing water, excessive dust, and mud, and stored no closer 

than 50 feet from an energized portion of a substation or 

transmission line. The conductor must be covered. 

11.2.2 Protective covering must be removed at the job site and 

the outside layer of each reel must be examined by the contractor 

and the engineer to be sure that the wire is in good condition 

and that no nails, staples, or other sharp objects, which could 

damage the wire during unreeling, protrude on the inside of the 

reel heads. 

11.2.3 Identification tags and markers must be retained on the 

reels. For future reference, the contractor shall record on 

forms supplied by the engineer, the reel number, length of wire, 

net weight, and the structure numbers where the wire was 

installed. 

11.2.4 Conductor reels should not be rolled. They should be 

lifted or transported by a reel dolly. If they do need to be 

rolled to a location where they can be easily handled, they 

should be rolled in the direction that would tend to tighten 

rather than loosen the conductor on the reel. 
Bulletin 1728F-810 

Page 11-2 

11.3. Tools and Equipment

11.3.1 Tools and equipment for wire work must be of the proper 

size and type for the job and must be in good working condition. 

Sheaves, tensioners, pullers, wire grips compressors, and dies 

must be properly sized for the specific wires to be installed. 

11.3.2 Stringing blocks must be neoprene lined, free running, 

and of the proper diameter and groove size for the wire being 

pulled. 

11.3.3 Tensioner bullwheels must be neoprene lined and of the 

proper size and design for the wire being pulled. 

11.4 Guard Structures

11.4.1 Guard structures must be furnished and installed by the 

contractor, where required, to prevent the conductor or overhead 

ground wires which are being pulled from coming into contact with 

existing overhead electric supply lines, communication lines, 

roads, highways, and railroads crossed by the transmission line. 

All labor and materials required must be furnished by the 

contractor and included in the unit cost for conductor units. 

11.4.2 If not part of the right-of-way agreement previously 

executed, permission to install guard structures on private 

property or public highway right-of-way must be obtained by 

(engineer to check one): 

 Private Public

 a. The borrower or engineer ........ .......... b. The contractor .................. ..........

11.4.3 After completion of all wire work, the contractor shall 

remove the guard structures, fill and tamp all pole holes, and 

restore the right-of-way and access to its original condition. 

11.5 Stringing

11.5.1 The method of installing the conductor and the overhead 

ground wire must be as designated by the engineer. When 

controlled tension stringing is specified, it must be performed 

in accordance with IEEE Standard 524, Guide to the Installation 

of Overhead Transmission Line Conductors, and subject to the 

manufacturer's concurrence (engineer to check one for each): 
Bulletin 1728F-810 

Page 11-3 

 Conductor Installation

 a. Controlled Tension Stringing ........... 

 b. Other (specify) ________________________ 

 Overhead Ground Wire Installation

 a. Controlled Tension Stringing ........... 

 b. Other (specify) ________________________ 

11.5.2 The precise stringing procedure which the contractor 

intends to use must be submitted to the engineer for review and 

approval prior to any wire work. This procedure must include a 

description of all major pieces of equipment to be used, number 

of crews, composition and responsibilities of each crew, proposed 

equipment set up locations, wire reel locations, locations of all 

splices, and locations and descriptions of temporary snubs and 

anchors. 

11.5.3 Extreme care must be exercised during the wire stringing 

operation to avoid damage to conductor or overhead ground wire 

strands. If damage is found, the stringing must be stopped. 

Damage is defined as any deformity of the wire which can be 

detected by sight or touch. Kinked, twisted, abraded, "birdcaged," or flattened wire will not be allowed to remain on the 

line. Any wire so damaged must be repaired or replaced by the 

contractor at his own expense and to the satisfaction of the 

engineer. 

11.5.4 The contractor shall continuously inspect the wire as it 

leaves the reels. If the wire has an accumulation of dirt, oil, 

grease, or any other foreign substance, such substance must be 

removed as the wire leaves the reels during the stringing 

operation by a method approved by the engineer. 

11.5.5 Wire tension during stringing must be high enough to 

ensure that the wire does not drag across the ground, underbrush, 

trees, towers, fences, guard structures, or any other surface 

other than the stringing sheaves. A stringing tension of not 

less than 50 percent nor more than 80 percent of the initial 

sagging tension should be used. 

11.5.6 No more than two reels of wire per phase may be pulled at 

a time. Full tension compression splices must not be pulled 

through the stringing blocks. 

11.5.7 When stringing wire on H-frame structures, the center 

phase must always be pulled first. The outside phases must be 

pulled alternately in successive pulls. If all three phases are 

strung in one pull, the middle phase must lead the outer phases 

by not less than 100 feet. 
Bulletin 1728F-810 

Page 11-4 

11.5.8 Wire must not be pulled during adverse weather conditions 

or when such conditions are imminent as determined by the 

engineer. 

11.5.9 The air temperature at the time and place of stringing 

must be determined by a certified thermometer. 

11.6 Sagging

11.6.1 Wires must be sagged to the proper tensions in accordance 

with the initial stringing sag and tension tables provided by the 

engineer. Sags will be checked by sighting with target and 

transit as indicated in the IEEE Standard 524. Sags must be 

within a tolerance of +3 and -0 inches of the specified values. 

When approved by the engineer, sags may be checked by the return 

wave method. 

11.6.2 The air temperature at the time and place of clipping in 

must be determined using a certified thermometer. The 

temperatures at which the conductor is sagged in and the spans in 

which sags are measured must be recorded, and the information 

given to the engineer. 

11.6.3 In hilly or mountainous terrain, the offset clipping 

method may be required in order to insure equalized tensions and 

plumbing of insulators on suspension structures. Calculations 

for offset clipping/sag corrections must be done and values for 

sagging must be furnished by the engineer. The contractor shall 

furnish all stringing set up information to the engineer at least 

6 weeks prior to the sagging operations. The contractor shall 

keep a record of sag data. 

11.6.4 The contractor shall select the length of each sag and 

the sag-checking spans, subject to the review and approval of the 

engineer. The contractor's sagging method must result in uniform 

tensions throughout the sag and the allowable sag tolerances must 

not be exceeded. 

11.6.5 The contractor shall budget the stringing time so that a 

reel of wire is sagged within 72 hours after the start of the 

stringing operation. If this is not possible in isolated areas, 

the engineer shall be consulted regarding the necessity of using 

creep correction factors with the specified chart sags. 

11.6.6 The contractor shall make any necessary adjustments in 

the wires or clamps at any time during the construction period to 

insure that the wire is at the proper tension, sags are within 

tolerance, suspension insulator strings and overhead ground wire 

assemblies hang plumb. 

11.7 Clipping, Deadending, and Splicing
Bulletin 1728F-810 

Page 11-5 

11.7.1 The contractor shall take into consideration the strength 

limitations of all structures in so far as the application of 

temporary wire stringing loads. All temporary back snubs and 

pull-downs on structures other than strain structures must be 

carefully planned and must meet the approval of the engineer. 

11.7.2 Use of wire reels must be carefully planned to minimize 

the number of full tension splices. There must never be more 

than one compression fitting per wire in any span and splices 

must not be located within 25 feet of a conductor support. 

Splices must not be located in spans over roads, railroads, and 

utility crossings, or in the spans adjacent to the crossing span. 

Splices must also not be located in the span where the conductor 

is to be deadended. 

11.7.3 Compression deadends and splices must be installed in 

accordance with the manufacturer's recommendations. Conductor 

strands within the splice area must be carefully cleaned with a 

steel brush, cotton rags, and solvents. Filler compound must be 

furnished and pressure installed by the contractor. Special care 

must be exercised in making compression fittings to insure use of 

proper die size, accurate cutting of wire, complete insertion of 

the cable strands, and pressing to produce a straight, uniform 

fitting. The contractor shall make up one splice and deadend to 

use as a sample in order to determine how much wire needs to be 

cut back. 

11.7.4 After completion of pressing operations, the contractor 

shall clean the wire and fittings of excess grease and compound. 

All burrs and die flash marks must be removed with emery cloth. 

11.7.5 U-bolts on suspension clamps and strain deadend clamps 

must be evenly torqued to the manufacturer's recommended values. 

Keeper plates must be in place and properly seated. Conductor 

strands within the area of the fitting must be clean. The 

recommended cleaning method is to use a steel brush, cotton rags, 

and solvents. 

11.7.6 Wires must be clipped into suspension clamps within not 

less than 12 hours and not more than 72 hours after the start of 

each individual wire pulling operation. Cables must be lifted 

from the sheaves using standard suspension clamps or plate hooks 

8 inches or larger to provide adequate support for the cables 

without damaging individual strands or kinking the wire. 

11.7.7 With pin-type insulators, the conductors must be tied in 

the top groove of the insulator on tangent poles and on the side 

of the insulator away from the strain at angles. Factory formed 

ties must be installed in accordance with the manufacturer's 

recommendations. 

11.8 Jumper
Bulletin 1728F-810 

Page 11-6 

11.8.1 Jumpers must be installed as shown on the drawings. 

Compression jumper terminals must be used with compression 

deadends and compression jumper connectors must be used with 

strain clamps. The cost of installation of these items must be 

included with the bid units for installing conductors. All 

jumpers must be installed in accordance with the manufacturer's 

recommendations. 

11.8.2 Jumper wire loops must be of sufficient length to present 

a smooth, uniformly curving appearance, and which do not put the 

jumper string of insulators in compression. Excess length of 

conductor from the wire stringing operation may be used to make 

up the jumper loops. 

11.9 Temporary Grounds

11.9.1 During the wire work, the contractor shall take all 

necessary steps to insure proper temporary grounding of the 

structures, cables, and equipment. All applicable Federal, 

State, and local safety regulations must be strictly adhered to. 

11.9.2 A record of all temporary conductor grounds must be kept 

to insure that they are all removed and the line can be safely 

energized at the end of the construction period. 

11.10 Reels and Excess Conductor

11.10.1 When wire is furnished by the borrower, the contractor 

shall be responsible for salvaging the wire reels and all excess 

conductor and overhead ground wire. All such wire must be 

inventoried, placed on reels, and returned to the borrower or 

disposed of as directed by the engineer. 

11.10.2 Returnable reels must be shipped back to the wire 

fabricators in accordance with the engineer's instruction. 

Nonreturnable wood reels must be disposed of in a manner meeting 

the approval of the engineer. 

11.10.3 All costs associated with the receiving, handling, 

shipping, or disposal of excess wire and reels must be in the 

labor costs for installation of wire units. 

11.11 Special Conditions (to be completed by the engineer): 
Bulletin 1728F-810 

Page A12. DRAWINGS 

12.1 Index of Drawings: The following drawings are part of the 

technical specification (engineer to complete): 
Bulletin 1728F-810 

Page 12-2
PART II 

DRAWINGS 





















































































































Bulletin 1728F-810 

Page A-1 

CONSTRUCTION DRAWINGS 

INDEX BY DESCRIPTION

 DESCRIPTION DESIGNATION PAGE

ANCHORS

 Log - Single Rod..........................................TA-2L,2LC....................... 63 

 Log - Double Rod..........................................TA-4L,4LC....................... 65 

 Plate Steel Cross.........................................TA-2P,3P,2PC,3PC................ 64 

 Power Screw...............................................TA-2H to 4H..................... 66 

BRACKET & GUY ATTACHMENT

 Light Duty Bracket (1’-0”) & Guy Attachment...............TG-18........................... 75 

 Medium Duty Bracket (1’-0”) & Guy Attachment..............TG-28........................... 80 

CROSSARM DRILLING GUIDE

 Six to Nine Foot..........................................TCD-6........................... 96 

 Ten to Ten Foot - Six Inches..............................TCD-10.......................... 97 

 Eleven to Twelve Foot.....................................TCD-11.......................... 98 

 Twenty to Twenty-Three Foot...............................TCD-20.......................... 99 

 Twenty-Six to Twenty-Nine Foot Crossarms..................TCD-26.......................... 100 

 Length as Required Crossarms..............................TCD-91.......................... 101 

FOUNDATION UNITS

 Pole Stability, Bearikng @ Uplift.........................TM-101,102,103................... 57 

GUYING ASSEMBLIES

 Automatic with Thimble Clevis.............................TG-12,22........................ 70 

 Factory Formed with Thimble Clevis........................TG-11,21........................ 69 

 Three Bolt Clamp with Guy Link............................TG-24........................... 76 

 Three Bolt Clamp with Guy Thimble.........................TG-13........................... 71 

 Three Bolt Clamp with Thimble Clevis......................TG-10,20........................ 68 

 Wrap......................................................TG-1............................ 67 

 Guy Link Assembly.........................................TG-92........................... 88 

GROUNDING ASSEMBLIES

 Multiple Pole & Anchor Grounding..........................TM-9(2 of 2).................... 51 

 Pole Ground & Butt Wrap...................................TM-9(1 of 2).................... 50 

GUY ATTACHMENTS

 Light Duty Guying Plate...................................TG-15........................... 70 

 Light Duty Wrap...........................................TG-16........................... 69 

 Light Duty Pole Eye Plates................................TG-17........................... 76 

 Medium Duty Guying Tees...................................TG-25........................... 68 

 Medium Duty Pole Bands....................................TG-26........................... 67 

 Medium Duty Pole Eye Plates...............................TG-27........................... 88 

Guying Guides

 Single Pole (no OHGW) ....................................TMG-2........................... 107 

 Single Poles (with OHGW) .................................TMG-2G.......................... 108 

 3 Pole Medium Angle (no OHGW).............................TMG-3........................... 109 

 3 Pole Medium Angle (with OHGW)...........................TMG-3G.......................... 110 

 3 Pole Large Angle (no OHGW)..............................TMG-4........................... 111 

 3 Pole Large Angle (with OHGW)............................TMG-4G.......................... 112 

 3 Pole Large Angle Deadend (no OHGW)......................TMG-5........................... 113 

 3 Pole Large Angle Deadend (with OHGW)....................TMG-5G.......................... 114 

 3 Pole Tangent Deadend.(no OHGW)..........................TMG-5D.......................... 115 

 3 Pole Tangent Deadend.(with OHGW)........................TMG-5GD......................... 115 
Bulletin 1728F-810 

Page A-2 

INDEX BY DESCRIPTION

DESCRIPTION DESIGNATION PAGE

INSULATOR ASSEMBLIES

 Line Post.................................................TM-3............................ 47 

 Insulator String with Suspension Clamp....................TM-1............................ 45 

 Insulator String with Cushioned Suspension................TM-2............................ 46 

MISCELLANEOUS ASSEMBLIES

 Interchangeable Hardware..................................TM-121.......................... 62 

 Crossarm Spacer Assembly..................................TM-111.......................... 59 

 Crossbrace (20,000 lbs., Max.)............................TM-110A,B,C,.................... 58 

 Fence Gates...............................................TM-30........................... 56 

 Hardware..................................................TM-120.......................... 61 

 Steel Upswept Arm Assembly................................TM-115.......................... 60 

OVERHEAD GROUND WIRE ASSEMBLIES

 Cushioned Suspension & Suspension Clamp...................TM-4............................ 48 

OVERHEAD GROUND WIRE SUPPORT ASSEMBLY

 Single & Double Bolt......................................TM-6............................ 49 

POLE FRAMING DETAILS

 Guide Details.............................................TPF-1........................... 102 

 Structure TH-1............................................TPF-5A.......................... 106 

 Structure TH-1A & TH-1G...................................TPF-5........................... 105 

 Structure TP-1............................................TPF-4........................... 104 

 Structures TS-1, TS-1X, TSS-1.............................TPF-3........................... 103 

POLE TIE ASSEMBLIES

 Light Duty

 Angle, Guying & Deadend Pole Tie - Guying Plate...........TG-45........................... 81 

 Angle, Guying & Deadend Pole Tie - Wrap...................TG-46........................... 82 

 Angle, Guying & Deadend Pole Tie - Pole Eye Plates........TG-47........................... 83 

 Medium Duty

 Angle, Guying & Deadend Pole Tie - Bands..................TG-56........................... 86 

 Angle, Guying & Deadend Pole Tie - Pole Eye Plates........TG-57........................... 87 

 Angle, Guying & Deadend Pole Tie - Guying Tees............TG-55........................... 85 

 Angle, Guying & Deadend Pole Tie - Tees & Guy Link........TG-54........................... 84 

RIGHT-OF-WAY CLEARING GUIDES

 Feathered/Clear-Cut Clearing..............................TM-15,15(1),13.................. 55 

 Feathered/Undulating Clearing.............................TM-14,14(1),13.................. 54 

 Guide for Measuring R.O.W. Clearing Units.................TM-11........................... 52 

 R.O.W. Clearing...........................................TM-12,12(1),13.................. 53 

SUBASSEMBLIES GUIDE.........................................TE-1............................ 4a 

TRANSMISSION LINE STRUCTURES

 Tangent Structure

 Horizontal Line Post.(no OHGW)............................TP-34,46,69..................... 1 

 Horizontal Line Post (with OHGW)..........................TP-34G,46G,69G.................. 4 

 Line Post (no OHGW).......................................TP-3,3A,4,4A.................... 8 

 Line Post - 46 kV Max. (with OHGW)........................TP-7,8.......................... 10 

 Line Post - Double Circuit (no OHGW)......................TP-3,4.......................... 12 

 Line Post - Double Circuit (with OHGW)....................TPD-7,8......................... 14 

 Line Post/Suspension......................................TPS-1........................... 15 

INDEX BY DESCRIPTION

DESCRIPTION DESIGNATION PAGE

Tangent Structure

 Pin Type Insulator (no OHGW)..............................TP-1,1A,2,2A.................... 7 

 Pin Type Insulator (with OHGW)............................TP-5,5A,6,6A.................... 9 
Bulletin 1728F-810 

Page A-3 

 Pin Type Insulator - Double Circuit (no OHGW).............TPD-1,2......................... 11 

 Pin Type Insulator - Double Circuit (with OHGW)...........TPD-5,6......................... 13 

 Suspension (69 kV Max.)...................................TS-1,1X,2,2X.................... 16 

 TS-1L,1LX....................... 19 

TS-9............................ 20 

 TSS-1,2......................... 22 

 TSS-1L2......................... 25 

 TS-9............................ 26 

 TU-1,1A,1AA..................... 30 

 Suspension, Double Circuit (69 kV Max.)...................TSD-1, 1X,2,2X.................. 21 

 TSSD-1,1X,2,2X.................. 27 

 Wishbone - Single Arm.....................................TSZ-1........................... 28 

 Wishbone - Double Arm.....................................TSZ-2........................... 29 

 H-Frame - Single Arm......................................TH-1,1G......................... 35 

 H-Frame - Single Arm with Brackets........................TH-9,9G......................... 44 

 Angle Structures

 Small Angle Horizontal Line Post (no OHGW)................TP-34B,46B,69B.................. 2 

 TP-34C,46C,69C.................. 3 

 Small Angle Horizontal Line Post (with OHGW)..............TP-34GB,46GB,69GB............... 5 

 TP-34GCC,46GC,69GC.............. 6 

 Small Angle Suspension ...................................TS-1B,1BX....................... 17 

 TS-1C........................... 18 

 TSS-1B.......................... 23 

 TSS-1C.......................... 24 

 Small Angle H-Frame.......................................TH-1C, 1CG, 1CX, 1CGX........... 36 

 Medium Vertical Angle (no OHGW)...........................TS-3,3A......................... 31 

 Medium Vertical Angle (with OHGW).........................TS-3G, 3GA...................... 32 

 Medium Angle - 3 Pole.....................................TS-3,3G......................... 37 

 Large Vertical Angle (no OHGW)............................TS-4............................ 31 

 Large Vertical Angle (with OHGW)..........................TS-4G........................... 32 

 Large Angle - 3 Pole......................................TS-4,4G......................... 38 

 Double Deadend Structures

 Vertical, Single Pole.....................................TS-5,5A......................... 33 

 Vertical, Single Pole.....................................TS-5G,5GA....................... 34 

 Large Angle 3-Pole (no OHGW)..............................TH-5............................ 39 

 Large Angle 3-Pole (with OHGW)............................TH-5G........................... 40 

 Tangent - 3 Pole.(no OHGW)................................TH-5D........................... 41 

 Tangent - 3 Pole.(with OHGW)..............................TH-5GD.......................... 42 

 Two Pole Double Deadend...................................TH-7,7G......................... 43 

TRANSMISSION LINE STRUCTURE DETAILS

 Brace to Arm..............................................TD-6............................ 92 

 Brace to Pole.............................................TD-7............................ 93 

 Crossarm to Pole..........................................TD-4,5.......................... 91 

 Miscellaneous.............................................TD-9............................ 94 

 Pin Insulator Mountings...................................TD-1............................ 89 

 Vertical Post Insulator Mountings.........................TD-2............................ 90 

Bulletin 1728F-810 

Page B-1 

CONSTRUCTION DRAWINGS 

INDEX BY DESIGNATION

DESIGNATION DESCRIPTION PAGE

TA-2H to 4H...........Power Screw Anchors.................................................... 66 

TA-2L, 2LC............Single Rod Log Anchor.................................................. 63 

TA-2P, 3P, 2PC, 3PC...Steel Cross Plate Anchor............................................... 64 

TA-4L, 4LC............Double Rod Log Anchor.................................................. 65 

TCD-6.................Six to Nine Foot Crossarms............................................. 96 

TCD-10................Ten to Ten Foot-Six Inch Crossarms..................................... 97 

TCD-11................Eleven to Thirteen Foot-Six Inch Crossarms............................. 98 

TCD-20................Twenty to Twenty-Three Foot Crossarms.................................. 99 

TCD-26................Twenty-Six to Twenty-Nine Foot Crossarms............................... 100 

TCD-91................Thirty-Two to Thirty-Nine Foot Crossarms............................... 101 

TD-1..................Pin Insulator Mounting Details......................................... 96 

TD-2..................Vertical Post Insulator Mounting Details............................... 97 

TD-4,5................Crossarm to Pole Details............................................... 98 

TD-6..................Brace to Arm Details................................................... 99 

TD-7..................Brace to Pole Details.................................................. 100 

TD-9..................Miscellaneous.......................................................... 101 

TE-1..................Guide to Subassemblies................................................. 4a 

TG-1..................Wrap - Guy Assembly.................................................... 67 

TG-10, 20.............Three Bolt Clamp with Thimble Clevis - Guy Assembly.................... 68 

TG-11, 21.............Factory Formed with Thimble Clevis - Guy Assembly...................... 69 

TG-12, 22.............Automatic with Thimble Clevis - Guy Assembly........................... 70 

TG-13.................Three Bolt Clamp with Guy Thimble - Guy Assembly....................... 71 

TG-15.................Light Duty Guying Plate - Guy Attachment............................... 72 

TG-16.................Light Duty Wrap - Guy Attachment....................................... 73 

TG-17.................Light Duty Pole Eye Plates - Guy Attachment............................ 74 

TG-18.................Light Duty Bracket (1’-0”) & Guy Attachments........................... 75 

TG-24.................Three Bolt Clamp with Guy Link - Guy Assembly.......................... 76 

TG-25.................Medium Duty Guying Tee - Guy Attachment................................ 77 

TG-26.................Medium Duty Pole Bands - Guy Attachment................................ 78 

TG-27.................Medium Duty Pole Eye Plates - Guy Attachment........................... 79 

TG-28.................Medium Duty Bracket (1’-0”) & Guy Attachment........................... 80 

TG-45.................Angle, Guying & Deadend Pole Tie - Light Duty Guying Plate............. 81 

TG-46.................Angle, Guying & Deadend Pole Tie - Light Duty Wrapped.................. 82 

TG-47.................Angle, Guying & Deadend Pole Tie - Light Duty Pole Eye Plates.......... 83 

TG-54.................Angle, Guying & Deadend Pole Tie - Medium Duty Tees and Guy Link....... 84 

TG-55.................Angle, Guying & Deadend Pole Tie - Medium Duty Guying Tees............. 85 

TG-56.................Angle, Guying & Deadend Pole Tie - Medium Duty Pole Bands.............. 86 

TG-57.................Angle, Guying & Deadend Pole Tie - Medium Duty Pole Eye Plates......... 87 

TG-92.................Guy Hardware, Link Assembly............................................ 88 

TH-1, 1G..............Tangent H-Frame, Single Arm............................................ 35 

TH-1C,1CG,1CX,1CGX....Small Angle H-Frame, Single Arm........................................ 36 

TH-3, 3G..............Medium Angle - 3 Pole Structure........................................ 37 

TH-4, 4G..............Large Angle - 3 Pole Structure......................................... 38 

TH-5..................Large Angle Double Deadend - 3 Pole Structure (no OHGW)................ 39 

TH-5G.................Large Angle Double Deadend - 3 Pole Structure (with OHGW).............. 40 

TH-5D.................Tangent Double Deadend - 3 Pole Structure (no OHGW).................... 41 

TH-5GD....................Tangent Double Double Deadend - 3 Pole Structure (with OHGW)....... 42 

TH-7, 7G..................Two Pole Double Deadend............................................ 43 

TH-9, 9G..................Tangent H-Frame, Single Arm with Brackets.......................... 44 

TM-1......................Insulator String with Suspensions Clamp............................ 45 

TM-2......................Insulator String with Cushioned Suspension......................... 46 

TM-3......................Line Post.......................................................... 47 

TM-4......................Cushioned Suspension & Suspension Clamp for OHGW................... 48 

TM-6.. ...................Single & Double Bolt OHGW Support Assembly......................... 49 

TM-9(1 of 2)..............Pole Ground & Butt Wrap Ground Assembly............................ 50 

TM-9(2 of 2)..............Multiple Pole & Anchor Ground Assemblies........................... 51 

INDEX BY DESIGNATION

DESIGNATION DESCRIPTION PAGE

TM-11.....................Guide for Measuring R.O.W. Clearing Units.......................... 52 

TM-12, 12(1), 13..........R.O.W. Clearing Guide.............................................. 53 

TM-14, 14(1), 13..........Feathered/Undulating Clearing...................................... 54 

TM-15, 15(1), 13..........Feathered/Clear-Cut Clearing....................................... 55 
Bulletin 1728F-810 

Page B-2

TM-30.....................Fence Gates........................................................ 56 

TM-101, 102, 103..........Pole Stability, Bearing & Uplift Foundation Units.................. 57 

TM-110A, B, C.............Crossbrace Assemblies - 20,000 lbs. Max............................ 58 

TM-111....................Crossarm Spacer Assembly........................................... 59 

TM-115....................Steel Upswept Arm Assembly......................................... 60 

TM-120....................Hardware........................................................... 61 

TM-121....................Interchangeable Hardware........................................... 62 

TMG-2.....................Single Poles (no OHGW) Guying Guide................................ 107 

TMG-2G....................Single Poles (with OHGW) Guying Guide.............................. 108 

TMG-3.....................3 Pole Medium Angle (no OHGW) Guying Guide......................... 109 

TMG-3G....................3 Pole Medium Angle (with OHGW) Guying Guide....................... 110 

TMG-4.....................3 Pole Large Angle (no OHGW) Guying Guide.......................... 111 

TMG-4G....................3 Pole Large Angle (with OHGW) Guying Guide........................ 112 

TMG-5.....................3 Pole Large Angle Deadend (no OHGW) Guying Guide.................. 113 

TMG-5G....................3 Pole Large Angle Deadend (with OHGW) Guying Guide................ 114 

TMG-5GD...................3 Pole Tangent Deadend (with OHGW) Guying Guide.................... 116 

TP-1, 1A, 2, 2A...........Tangent with Pin Type Insulators (no OHGW)......................... 7 

TP-3, 3A, 4, 4A...........Tangent Line Post Insulators (no OHGW)............................. 8 

TP-5, 5A, 6, 6A...........Tangent with Pin Type Insulators (with OHGW)....................... 9 

TP-7, 8...................Tangent with Line Post Insulators (with OHGW)...................... 10 

TP-34, 46, 69.............Tangent with Horizontal Line Posts (no OHGW)....................... 1 

TP-34B, 46B, 69B..........Small Angle with Horizontal Line Posts (no OHGW)................... 2 

TP-34C, 46C,69C...........Small Angle with Horizontal Line Posts (no OHGW)................... 3 

TP-34G, 46G, 69G..........Tangent with Horizontal Line Posts (no OHGW)....................... 4 

TP-34GB, 46GB, 69GB.......Small Angle with Horizontal Line Posts (with OHGW)................. 5 

TP-34GC, 46GC, 69GC.......Small Angle with Horizontal Line Posts (with OHGW)................. 6 

TPD-1, 2..................Tangent Double Circuit with Pin Type Insulators (no OHGW).......... 11 

TPD-3, 4..................Tangent Double Circuit with Line Posts (no OHGW)................... 12 

TPD-5, 6..................Tangent Double Circuit with Pin Type Insulators (with OHGW)........ 13 

TPD-7,8...................Tangent Double Circuit with Line Posts (with OHGW)................. 14 

TPF-1.....................Guide Pole Framing Details......................................... 102 

TPF-3.....................TS-1, TS-1X, TSS-1 Pole Framing Details............................ 103 

TPF-4.....................TP-1 Pole Framing Details.......................................... 104 

TPF-5.....................TH-1A & TH-1G Pole Framing Details................................. 105 

TPF-5A....................TH-1 Pole Framing Details.......................................... 106 

TPS-1.....................Tangent with Line Post/Suspension Insulators....................... 15 

TS-1, 1X, 2, 2X...........Tangent with Suspension Insulators................................. 16 

TS-1B, 1BX................Small Angle with Suspension Insulators............................. 17 

TS-1C.....................Small Angle with Suspension Insulators............................. 18 

TS-1L, 1LX................Tangent with Suspension Insulators................................. 19 

TS-3, 3A..................Medium Vertical Angle (no OHGW).................................... 31 

TS-3G, 3GA................Medium Vertical Angle (with OHGW).................................. 32 

TS-4......................Large Vertical Angle (no OHGW)..................................... 33 

TS-4G.....................Large Vertical Angle (OHGW)........................................ 32 

TS-5, 5A..................Large Vertical Angle Double Deadend (no OHGW)...................... 33 

TS-5G, 5GA................Large Vertical Angle Double Deadend (with OHGW).................... 34 

TS-9......................Tangent with Suspension Insulators................................. 20 

TSD-1, 1X, 2, 2X..........Tangent Double Circuit with Suspension Insulators.................. 21 

TSS-1, 2..................Tangent with Suspension Insulatos and Brackets..................... 22 

TSS-1B....................Small Angle with Suspension Insulators............................. 23 

TSS-1C....................Small Angle with Suspension Insulators............................. 24 

TSS-1L....................Tangent with Suspension Insulators................................. 25 

TSS-9.....................Tangent with Suspension Insulators and Brackets.................... 26 

TSSD-1, 1X, 2, 2X.........Tangent Double Circuit with Suspension Insulators.................. 27 

INDEX BY DESIGNATION

DESIGNATION DESCRIPTION PAGE

TSZ-1.....................Tangent Wishbone with Single Arm................................... 28 

TSZ-2.....................Tangent Wishbone ith Double Arms................................... 29 

TU-1, 1A, 1AA.............Tangent with Steel Upswept Arms and Suspension Insulators.......... 30 

TSZ-115...................Tangent Wishbone - Single Arm, 115 kV Max.......................... 10 

TSZ-115A..................Tangent Wishbone - Double Arm, 115 kV Max.......................... 11 

TSZ-115B, C...............Small Angle Wishbone - Double Arm, 115 kV Max...................... 12 

TSZ-138...................Tangent Wishbone - Single Arm, 138 kV Max.......................... 13 

TSZ-138A..................Tangent Wishbone - Double Arm, 138 kV Max.......................... 14 

TSZ-138B, C...............Small Angle Wishbone - Double Arm, 138 kV Max...................... 15 
Bulletin 1728F-810 

Page B-3

TU-1, 1A, 1AA.............Tangent with Steel Upswept Arms & Suspension Insulators............ 16 

Bulletin 1728F-810 

C-1 

Selected SI-Metric Conversions

AREA

To Convert From To Multiply by 

circular mil (cmil) square meter (m2

) 5.067075 E-10 

square centimeter (cm2) square meter (m2) *1.000 E-04 

square foot (ft2

) square meter (m2) *9.290304 E-02 

square inch (in2

) square meter (m2) *6.451600 E-04 

square kilometer (km2

) square meter (m2) *1.000 E+06 

square mile (mi2

) square meter (m2) 2.589988 E+06 

FORCE

To Convert From To Multiply by 

kilgram force (kgf) newton (N) *9.806650 

kip newton (N) 4.448222 E+01 

pound force (1bf) newton (N) 4.448222 

FORCE PER LENGTH

To Convert From To Multiply by 

kilogram force (kgf) 

 meter (kgf/m) newton per meter (N/m) *9.806650 

pound per foot (1b/ft) newton per meter (N/m) 1.459390 E+01 

DENSITY

To Convert From To Multiply by 

pound per cubic inch kilogram per cubic 

 (1b/in3) meter (kg/m3) 2.76790 E+04 

pound per cubic foot kilogram per cubic 

 (1b/ft3

) meter (kg/m3) 1.6014 E+01 

LENGTH

To Convert From To Multiply by 

foot (ft) meter (m) 3.048 E-01 

inch (in) meter (m) *2.540 E-02 

kilometer (km) meter (m) *1.000 E+02 

mile (mi) meter (m) *1.609344 E+03 

LINEAR DENSITY

To Convert From To Multiply by 

pound per foot (1b/ft) kilogram per meter (kg/m) 1.488164 

pound per inch (1b/in) kilogram per meter (kg/m) 1.785797 E+01 

LOAD CONCENTRATION

To Convert From To Multiply by 

pound per square kilogram per square 

 inch (1b/in3) meter (kg/m3) 7.030696 E+02 

pound per square kilogram per square 

 foot (1b/ft3

) meter (kg/m3) 4.882428 

ton per square kilogram per square 

 foot (ton/ft3

) meter (kg/m3) 9.071847 E+02 

 * Exact Conversion. 
Bulletin 1728F-810 

Page C-2 

Selected SI-Metric Conversions, cont.

MASS

To Convert From To Multiply by 

pound (avoirdupois) 1b) kilogram (kg) 4.535924 E-01 

PRESSURE

To Convert From To Multiply by 

kip per square inch 

 (kip/in2

) 

pascal (Pa) 6.894757 E+06 

kip per square foot 

 (kip/ft2

) 

pascal (Pa) 4.788026 E+04 

newton per square 

 meter (N/m2

) 

pascal (Pa) *1.000 

pound per square 

 foot (1b/in2

) 

pascal (Pa) 4.788026 E+01 

pound per square 

 inch (1b/in2

) 

pascal (Pa) 6.894757 E+03 

BENDING MOMENT

To Convert From To Multiply by 

kilogram force meter 

 (kgf-m) newton meter (N-m) *9.806650 

kip-foot (kip-ft) newton meter (N-m) 1.355818 E+02 

pound per foot (1b/ft) newton meter (N-m) 1.459390 E+01 

VELOCITY

To Convert From To Multiply by 

foot per second (ft/s) meter per second (m/s) *3.048 E-01 

kilometer per hour 

 (km/h) meter per second (m/s) 2.777778 E-01 

mile per hour (mi/h) meter per second (m/s) 4.470400 E-01 

meter per hour (m/h) meter per second (m/s) 2.777778 E-04 

VOLUME

To Convert From To Multiply by 

cubic foot (ft3

) cubic meter (m3) 2.831685 E-02 

cubic inch (in3) cubic meter (m3) 1.638706 E-05 

cubic kilometer (km3

) cubic meter (m3) *1.000 E+09 

cubic millimeter (mm3

) cubic meter (m3) *1.000 E-09 

TEMPERATURE

 °C °F 

X°C = --- 9X + 32 

 5 

 

X°F = 5(X - 32) 

 9 

--- 

 

* Exact Conversion.