not subject to anodic failure and lesser insulation
can be used.
Type RHH insulation should be used under hot asphalt.
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2.1.5.1
Wire Requirements
Wire shall be No. [12] [10] [_____] AWG solid copper wire, not less than 3
meters 10 feet long, unspliced, complying with NFPA 70, Type [TW] [RHH]
insulation. [Connecting wires for magnesium anodes shall be factory
installed with the place or emergence from the anode in a cavity sealed
flush with a dielectric sealing compound.] [Connecting wires for zinc
anodes shall be factory installed with the place of connection to the
protruding steel core completely sealed with a dielectric material.]
2.1.5.2
Anode Header Cable
Cable for anode header and distribution shall be No. [_____] AWG stranded
copper wire with type CP high molecular weight polyethylene, 2.8 mm 7/64
inch thick insulation, 600-volt rating.
2.2
MISCELLANEOUS MATERIALS
2.2.1
Electrical Wire
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NOTE: The cathodic protection system will fail
unless full consideration is given to specifications
for electrically insulating pipe joints,
electrically conductive pipe joints, and casing
cradles and seals. Mechanical and electrical
specifications should reference paragraphs
"Electrically Isolating Pipe Joints" and
"Electrically Conductive Couplings."
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Wire shall be No. [12] [10] [____] AWG stranded copper wire with NFPA 70,
Type [TW] [RHW-USE] [RHW-USE] [Polyethylene] [_____] insulation.
Polyethylene insulation shall comply with the requirements of ASTM D 1248
and shall be of the following types, classes, and grades:
High-molecular weight polyethylene shall be Type I, Class C, Grade E5.
High-density polyethylene shall be Type III, Class C, Grade E3.
2.2.1.1
Wire Splicing
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NOTE: In water tanks, split bolts are used (above
the water line only) because working space is
limited and the hydraulic or mechanical compression
tools may be cumbersome and hazardous to use; since
single split-bolt will work loose when the wires it
connects are moved, minimum of two split bolts
should be used. At ground level or in trenches,
compression tools can be used conveniently, and the
swaged sleeve connection produced by such tools is
more reliable than split bolts.
SECTION 13110A
Page 16
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