applicable.
2.1.2
Copper
Provide copper conductors on nonmetallic stacks that do not weigh less than
144.83 kg per 305 meters 319 pounds per thousand feet, and provide cable
such that the size of any strand in the cable is not less than No. 15 AWG.
Provide thickness of web or ribbon on stacks that is not less than No. 12
AWG. Provide loop conductors that are comprised of copper conductors not
smaller than No. 1/0 AWG.
2.1.3
Aluminum
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NOTE: This paragraph is to be deleted when used for
Atlantic Division, Naval Facilities Engineering
Command. Exception, Aluminum conductors are
allowable in Atlantic Division when specifically
required by the NFPA 780 (e.g. aluminum structures,
etc.)
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Do not allow aluminum to contact the earth and do not use in any other
manner that will contribute to rapid deterioration of the metal. Observe
appropriate precautions at connections with dissimilar metals in accordance
with NFPA 70 Article 110-14. Provide aluminum cable conductors for bonding
and interconnecting metallic bodies to main cable that are at least
equivalent to strength cross-sectional area of a No. 4 AWG aluminum wire.
When perforated strips are provided, use strips that are much wider than
solid strips. Use a strip width that is at least twice that of the
diameter of the perforations. Use an aluminum strip which has a thickness
of not less than the diameter of No. 12 AWG and at least 40 mm 1 1/2 inches
wide for connecting exposed water pipes.
2.2
COMPONENTS
2.2.1
Air Terminals
Provide terminals in accordance with UL 96, except provide Class II for
Class I and Class II applications. Support air terminals more than 610 mm
24 inches in length by suitable brace, with guides, not less than one-half
the height of the terminal.
2.2.2
Ground Rods
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NOTE: The designer will determine the type and
number of ground rods to be used based on local
conditions and earth resistivity data. Copper clad
steel rods will be specified for normal conditions.
Galvanized coated steel or stainless steel rods will
be used where low soil resistivities are encountered
and galvanic corrosion may occur between adjacent
underground metallic masses and the copper-clad
rods. Stainless steel rods have a longer life than
zinc coated steel, but use of these must be
justified based on the higher cost. In high
resistivity soils, 3050 mm 10 foot sectional rods
may be used to obtain the required resistance to
SECTION 13100N
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