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

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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

[DIVISION 16: ELECTRICAL]{.underline}

SECTION 16062 ‑ SECONDARY GROUNDING

USE: Furnishing and installing grounding systems for secondary
electrical distribution service equipment.

**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 16062**

**SECONDARY GROUNDING**

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

**1.1 SUMMARY**

** A. Section Includes: \[Furnishing\] \[and\] \[installing\]
grounding-system equipment for secondary electrical-distribution
services and equipment.**

**1.2 SUBMITTALS**

** A. General: Submittals shall be according to \[Section 01009 -
General Information and Requirements.\] \[Section 01330 ‑ Submittal
Procedures.\] \[Section 01365 - Certificates of Conformance.\]**

** B. Manufacturer\'s Literature: Submit 5 copies of the manufacturer\'s
technical data for the grounding system equipment to be used on this
project, including grounding conductors, ground rods and grounding
terminals and connectors.**

**1.3 QUALITY ASSURANCE**

** A. Labeling Requirements: Grounding-system equipment shall be
Underwriters Laboratories, Inc. (UL) listed and labeled. UL listing and
labeling will not be required if it can be shown that grounding system
equipment meets the requirements of another nationally recognized
testing laboratory (NRTL).**

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

**2.1 MATERIALS**

** A. General: Grounding-system components 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. Conductor Material: Soft‑drawn, annealed copper.**

** C. Conductor Type: Solid in sizes No. 8 AWG and smaller and stranded
in sizes No. 6 AWG and larger.**

** D. Conductor Insulation: Bare or with green insulation as specified
for Conductors for General Wiring in Section 16120 ‑ Conductors and
Cables.**

**E. Braided Bonding Jumpers: Copper tape, braided No. 30 AWG bare
copper wire, terminated with copper ferrules.**

**F. Bonding straps: Soft copper, 0.05 inch (1 mm) thick and 2 inches
(50 mm) wide, except as indicated.**

** G. Ground Rod Material: Copper-jacketed steel (copperweld).**

** H. Ground Rod Size: Not less than 3/4‑inch diameter by 10-feet
long.**

** I. Ground Rod Type: Sectional.**

** J. For Connection to Rods and Pipes up to One Inch OD: Two‑bolt,
saddle‑type pipe clamp with attached conduit hub and conductor lug.**

** K. Thermic Connection: For ground wire connection to solid ground
rod, thermic connection may be substituted for pipe clamp specified
above.**

** L. For Connection to Pipes up to 12 Inches OD: U-bolt and yoke with
attached conduit hub and conductor lug.**

** M. For Connection to a Flat Surface: Compression or screw clamp
terminal lug as described in Section 16120 - Conductors and Cables.**

** N. Ground Buses For Panelboards: As required in Section 16138 ‑
Cabinets and Enclosures.**

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

**3.1 INSTALLATION**

** A. General: Install grounding-system components as indicated or as
necessary, complying with the manufacturer\'s written instructions,
applicable requirements of codes and standards, and according to
recognized industry practices.**

** B. Service Grounding: Shall be according to Article 250 of the NFPA
70.**

** C. Equipment Grounding: Make tight metal-to-metal contact between all
metallic parts of the raceway system and enclosures to ensure a ground
fault current path of the lowest-possible impedance.**

** D. Supplementary Equipment-Grounding Conductors: Install a grounding
conductor, sized according to the NFPA 70 Table 250‑122, in flexible
conduit, in non‑metallic conduits, from the ground terminal on
receptacles, and where otherwise indicated. Connect the ends of
grounding conductors to any convenient metallic box or enclosure which
is connected to the rigid steel or EMT conduit system.**

** E. Metal Poles Supporting Outdoor Lighting Fixtures: Ground pole to a
grounding electrode in addition to separate equipment grounding
conductor run with supply branch circuit.**

** F. Grounding Rods: Locate a minimum of 1 rod length from each other
and at least the same distance from any other grounding electrode.**

a\. ab** Drive until tops are 2 inches (50 mm) below finished floor or
final grade, except as otherwise indicated.**

** 2. Interconnect with other grounding electrode conductors. Use
exothermic welds or grounding clamp connectors, unless otherwise
indicated. Make these connections without damaging copper coating or
exposed steel.**

G. ab** Grounding Conductors: Route along the shortest and straightest
paths possible, except as otherwise indicated. Avoid obstructing access
or placing conductors where they may be subjected to strain, impact, or
damage.**

H. ab** Metal Water Service Pipe: Provide insulated copper grounding
conductors, sized as indicated, in conduit, from building's main service
equipment, or grounding bus, to main metal water service entrances to
building. Connect grounding conductors to main metal water service pipes
by grounding clamp connectors. Where a dielectric main water fitting is
installed, connect grounding conductor to street side of fitting. Do not
install a grounding jumper across dielectric fittings. Bond grounding
conductor conduit to conductor at each end.**

I. ab** Water Meter Piping: Use braided type bonding jumpers to
electrically bypass water meters. Connect to pipe with grounding clamp
connectors.**

J. ab** Interior Metal: Bond interior metal piping systems and metal air
ducts to equipment grounding conductors of associated pumps, fans,
blowers, electric heaters, and air cleaners. Use braided type bonding
straps.**

K. ab** Ufer Ground (Concrete Encased Grounding Electrode): Fabricate
using a minimum of 20 feet of bare copper conductor not smaller than No.
4 AWG. Where base of concrete foundation is less than 20 feet in length,
coil excess conductor within base of concrete foundation. Bond grounding
conductor to reinforcing steel to at least 4 locations, and to anchor
bolts. Extend grounding conductor below grade and connect to building
grounding grid or to a grounding electrode external to concrete.**

L. ab** Grounding Bushings: Where steel conduits terminate without
mechanical connection to metallic enclosures, install a grounding
bushing on the end of each conduit and connect them to the enclosure
with a bare-copper grounding conductor sized according to NEC Table
250‑122 for the largest circuit being connected. For
electrically-noncontinuous conduits which contain only a grounding
conductor, bond the conduit and conductor together at both ends by means
of grounding bushings.**

** M. Service-Grounding Electrode: The resistance between the
service-grounding electrode and earth shall not be greater than 10 ohms.
When necessary, drive no more than two additional ground rods and
interconnect them with the original-grounding electrode to achieve this
conductivity requirement.**

** N. Ground Fault Current Path: The resistance between the
service-equipment enclosure and the metallic frame of any connected
equipment shall not be greater than 5 ohms. When necessary, clean and
tighten metal‑to‑metal connections or install supplementary-grounding
conductors in the ground path to achieve this conductivity
requirement.**

**[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**