\* \* \* \* \* \* \* \* \* \*

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

\* \* \* \* \* \* \* \* \* \*

[DIVISION 16: ELECTRICAL]{.underline}

SECTION 16072 ‑ SUPPORTING DEVICES

USE: Furnishing and installing supporting devices.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes 12/01

Metric: Not Applicable

Technical Update: 11/99

**SECTION 16072**

**SUPPORTING DEVICES**

**[PART 1: GENERAL]{.underline}**

**1.1 SUMMARY**

** A. Section Includes: \[Furnishing\] \[and\] \[installing\] supporting
devices as necessary and as required. **

**[PART 2: PRODUCTS]{.underline}**

**2.1 MATERIALS**

** A. General: Supporting devices shall be constructed of the
manufacturer\'s standard materials, as listed in published product
information; types and sizes shall be as indicated or as required for
the installation.**

** B. Material: Unless otherwise indicated, supporting devices shall be
made of steel or malleable iron and shall be galvanized or cadmium
plated.**

** C. Conduit Straps: Shall be according to Fed. Spec. FF‑S‑760 as
follows: one hole, malleable iron ‑ Type I, Style A.; one hole,
cold‑formed ‑ Type I, Style B; two hole, cold‑formed ‑ Type II, Style A.
Malleable iron straps and clamp backs shall be heat treated to reduce
brittleness.**

** D. Individual Conduit Hangers: Shall be one piece, steel construction
with zinc finish, designed for installation on the end of threaded rod
with compression or bolted clamp for holding conduit.**

** E. Spring Steel Box Conduit and Fixture Fasteners: Shall be made of
heat treated steel to produce spring action grip and shape retention.
Fasteners may be coated with zinc phosphate or other corrosion resistant
finish in lieu of galvanized or cadmium plating. Each spring steel
fastener shall be catalog listed as suitable for the way it is used.
Rods used with spring steel fasteners shall be not less than 1/4‑inch in
diameter.**

** F. Trapeze Hangers: Shall consist of a steel channel suspended
horizontally from two or more steel rods which are attached to building
structural members. Trapeze hangers shall be assembled from components
which are designed, produced and are catalog listed for the intended
use. Components of trapeze hanger assemblies, including beam clamps,
clevises and brackets used for attaching to the building structure,
shall be the product of the same manufacturer. Trapeze hanger components
shall not be loaded in excess of the manufacturer\'s design ratings. In
addition, trapeze hangers shall be as follows:**

**  1. Rods not less than 3/8‑inch diameter.**

** 2. Outside dimensions of channel cross section not less than 1‑1/2 x
1‑1/2 inches.**

** 3. Channel thickness not less than 12 ga.**

** 4. Channel edges at the open side shall be flanged in to produce a
\"J\" or \"L\" shaped lip in cross section.**

** 5. Threaded attachments to the channel shall be made by use of
special self‑retaining nuts designed to resist turning when attachments
are screwed in. Retention may be accomplished by coil spring or spring
clip attachments to the nuts or other approved means.**

** 6. Bolt‑assembled, two‑piece conduit clamps designed with ears to
engage the channel lips may be used on trapeze hangers in lieu of
conduit straps.**

** G. Level Adjustment: Support rods for single conduit and trapeze
hangers shall include adjustment means for controlling the level of
conduits. Where turnbuckles are used, they shall provide a minimum of
1‑1/2 inches of adjustment and incorporate locknuts. Where turnbuckles
are not used, rods shall be threaded to provide not less than 1‑1/2
inches of adjustment.**

** H. Perforated Steel Strap: Strap 18 ga or larger and 7/8 inches or
wider may be used to support suspended runs of single conduit 3/4 inches
or smaller.**

** I. Lighting Fixture Supports: Canopies, swivels and stems shall be as
follows:**

**  1. Suspension kits for fixtures suspended in finished space shall
include a deep dish canopy at least 1‑1/2 inches deep and 5 inches in
diameter, a swivel mechanism which permits stem deflection of 8 degrees
(minimum) off vertical in any direction, a stem at least 5/8 inches OD
with length appropriate for indicated mounting height, and miscellaneous
hardware. Stem and canopy shall be finished in white baked enamel. **

** 2. Suspension equipment for stem‑suspended fixtures in unfinished
space shall consist of a combination box cover and swivel mechanism with
threaded conduit hub. The swivel shall permit stem deflection of 20
degrees (minimum) off vertical. **

** 3. Canopies for stem‑mounted fixtures connected to formed sheet metal
raceway systems shall be the product of the raceway manufacturer. Sides
of the canopy shall be factory stamped to provide a knockout shaped like
the raceway profile to achieve a neat, tight‑fitting joint where the
raceway enters the canopy.**

** 4. Suspension equipment for chain‑suspended fluorescent fixtures
shall include a combination receptacle and box cover, chains and
cord‑set. The box cover shall have two chain hooks and two brackets on
top side which engage the ears of the outlet box to provide added safety
against falling off. Receptacle shall be NEMA 5‑15R. Chains shall have a
work load rating of 150 lb (minimum), shall have a \"Y\" yoke for
attachment at each end of the fixture, and shall have a corrosion
resistant finish. The wiring between the fixture and receptacle shall be
a cord set of 3/C, No. 16 (minimum), type SJ cord with a NEMA 5‑15P cap.
NEMA designations shall be according to NEMA WD6.**

**[PART 3: EXECUTION]{.underline}**

**3.1 INSTALLATION**

** A. General: Install supporting devices as necessary, complying with
manufacturer\'s written instructions, applicable requirements of codes
and standards, and according to recognized industry practices.**

** B. Conduit Supports: Support conduits which are not embedded,
independently and securely, so that no strain will be transmitted to
attached boxes when conductors are pulled in.**

** C. Supports for Small Conduits: Use one of the following to support
single runs of EMT not larger than 2 inches and rigid steel and
intermediate metal conduits not larger than 1 inch.**

**  1. Cold‑formed steel or malleable iron conduit straps**

** 2. Individual conduit hangers**

** 3. Spring steel conduit fasteners (in dry, noncorrosive space only)**

** D. Supports for Large Conduits: Use malleable iron straps or
individual conduit hangers for single runs of rigid steel and
intermediate metal conduits larger than 1 inch.**

** E. Supports for Multiple Conduit Runs: Use trapeze hangers to support
two or more conduits running parallel at the same elevation. Anchor each
conduit to the trapeze channel with conduit straps.**

** F. Supports for PVC Conduits: Use PVC coated, two hole conduit straps
to support PVC conduits and PVC jacketed steel conduits.**

** G. Conduits and Boxes above Suspended Ceilings: Perforated strap or
spring steel fasteners attached to ceiling support wires may be used in
lieu of conduit straps to support 1/2‑inch and 3/4‑inch conduits above
suspended ceilings. Attach only one conduit to any one strap or ceiling
support wire. Support conduits so they allow the removability of ceiling
panels or lay-in fluorescent lighting fixtures. Provide auxiliary metal
crossmembers of adequate strength and stiffness to support outlet boxes
installed at locations other than at main ceiling support members. Where
outlet boxes for suspended lighting fixtures are attached to and
supported from suspended ceilings, distribute the load over the ceiling
support members in an approved manner. Support junction and pull boxes
above suspended ceilings from the floor or roof structure above.**

** H. Methods of Attachment: Use the following methods for attachment to
the various parts of the building:**

**  1. Expansion bolts for concrete and brickwork**

** 2. Lag screws for wood**

** 3. Toggle bolts for hollow masonry**

** 4. Structural clamps, welded threaded studs, machine screws or bolts
for steel**

**[PART 4: MEASUREMENT AND PAYMENT]{.underline}**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN A \"LUMP SUM\" CONTRACT IS USED, DELETE THE TITLE PART 4:
MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01010
-SUMMARY OF WORK.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**4.1 METHOD OF MEASUREMENT**

** A. Units: The work described in this section will not be measured for
payment.**

**4.2 BASIS OF PAYMENT**

** A. Payment: No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract.**

**END OF SECTION**