GROUNDING AND BONDING

IEEE C62.11 and shall be provided where indicated. Arresters shall be

[station] [intermediate] [distribution] class, rated as shown. Arresters

for use at elevations in excess of 1.8 km 6000 feet above mean sea level

shall be specifically rated for that purpose. Arresters shall be equipped

with mounting brackets suitable for the indicated installations. Arresters

shall be of the [valve] [or] [metal-oxide varistor] [or] [combination

valve-metal-oxide varistor] type.

2.12

GROUNDING AND BONDING

2.12.1

Driven Ground Rods

Ground rods shall be [copper-clad steel conforming to UL 467] [zinc-coated

steel conforming to ANSI C135.30] [solid stainless steel] not less than [

15.9 mm 5/8 inch] [19 mm 3/4 inch] in diameter by [3.1 m 10 feet] [2.44 m 8

feet] in length. Sectional type rods may be used.

2.12.2

Grounding Conductors

Grounding conductors shall be bare, except where installed in conduit with

associated phase conductors. Insulated conductors shall be of the same

material as phase conductors and green color-coded, except that conductors

shall be rated no more than 600 volts. Bare conductors shall be ASTM B 8

soft-drawn unless otherwise indicated. Aluminum is not acceptable.

2.13

CONCRETE AND REINFORCEMENT

Concrete work shall have minimum 20 MPa 3000 psi compressive strength and

conform to the requirements of Section 03300A CAST-IN-PLACE STRUCTURAL

CONCRETE. Concrete reinforcing shall be as specified in Section 03200A

CONCRETE REINFORCEMENT.

2.14

PADLOCKS

Padlocks shall comply with Section 08710 DOOR HARDWARE.

2.15

CABLE FIREPROOFING SYSTEMS

Cable fireproofing systems shall be listed in FM P7825a as a

fire-protective coating or tape approved for grouped electrical conductors

and shall be suitable for application on the type of medium-voltage cables

provided. After being fully cured, materials shall be suitable for use

where exposed to oil, water, gases, salt water, sewage, and fungus and

shall not damage cable jackets or insulation. Asbestos materials are not

acceptable.

2.15.1

Fireproof Coating

Cable fireproofing coatings shall be compounded of water-based

thermoplastic resins, flame-retardant chemicals, and inorganic

noncombustible fibers and shall be suitable for the application methods

used. Coatings applied on bundled cables shall have a derating factor of

less than 5 percent, and a dielectric strength of 95 volts per mil minimum

after curing.

2.15.2

Fireproofing Tape

Fireproofing tape shall be at least 50 mm 2 inches wide and shall be a

flexible, conformable, polymeric, elastomer tape designed specifically for

SECTION 16375A

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