2.2.2.2
Grounding Provisions
Grounding provisions shall [be as specified in Section 16402 INTERIOR
DISTRIBUTION SYSTEM.] [comply with NFPA 70 and UL 467 including a ground
terminal in the cabinet.] The grounding conductor from the terminal to the
earth grounding system shall be solid or stranded copper not smaller than
No. 6 AWG. The earth grounding system shall consist of one or more ground
rods. Ground rods shall be of [copper-clad steel conforming to UL 467]
[zinc-coated steel conforming to ANSI C135.30] [solid stainless steel] not
less than [16] [19] mm [5/8] [3/4] inch in diameter by [2.4] [3.1] m [8]
[10] feet in length. Rods shall be driven full length into the earth.
Sectional type rods may be used.
2.2.2.3
Resistance to Ground
**************************************************************************
NOTE: Remove this paragraph if not required in the
project.
**************************************************************************
The resistance to ground shall be measured using the fall-of-potential
method described in IEEE Std 81. The maximum resistance of driven ground
shall not exceed 25 ohms under normally dry conditions. If this resistance
cannot be obtained with a single rod, [_____] additional rods not less than
1.8 m 6 feet on centers, or if sectional type rods are used, [_____]
additional sections may be coupled and driven with the first rod. In
high-ground-resistance, UL listed chemically charged ground rods may be
used. If the resultant resistance exceeds 25 ohms measured not less than
48 hours after rainfall, the Contracting Officer shall be notified
immediately. Connections below grade shall be fusion welded. Connections
above grade shall be fusion welded or shall use UL 467 approved connectors.
2.2.2.4
Cabinet Paint System
[The cabinet and mounting support shall be [painted] [hot dipped
galvanized] [aluminum] [stainless steel] with the manufacturer's standard
painting system.] [The mounting support for the fiberglass cabinet shall
be [painted] [hot dipped galvanized] [aluminum] [stainless steel] with the
manufacturer's standard painting system.]
2.2.3
Wiring
Wiring shall be installed in accordance with NFPA 70 utilizing type TW or
RHW or polyethylene insulation. Fittings for conduit and cable work shall
conform to UL 514A. Outlets shall be of the threaded hub type with
gasketed covers. Conduit shall be hub type with gasketed covers. Conduit
shall be securely fastened at 2.4 m 8 foot intervals or less. Splices
shall be made in outlet fittings only. Conductors shall be color coded for
identification. Cable for anode header and distribution shall be No. [2]
[_____] AWG stranded copper wire with type [cathodic protection high
molecular weight polyethylene] [Dular/Halar] insulation.
2.2.4
Oil Immersed Enclosures
**************************************************************************
NOTE: The enclosure should not be used in areas
prone to flooding unless required for hazardous
locations. Provisions should be made for flooding.
SECTION 13112A
Page 17
Previous Page
