PART 2
PRODUCTS
2.1
MATERIALS
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NOTE: Designer will list facilities requiring
certification of UL inspection. The list is to
include all Army facilities used for manufacturing,
processing, handling or storing explosives,
ammunition or explosive ingredients. On all other
Army facilities and on Air Force facilities, this
requirement will be deleted unless specifically
requested by the facility user.
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2.1.1
General Requirements
No combination of materials shall be used that form an electrolytic couple
of such nature that corrosion is accelerated in the presence of moisture
unless moisture is permanently excluded from the junction of such metals.
Where unusual conditions exist which would cause corrosion of conductors,
conductors with protective coatings or oversize conductors shall be used.
Where a mechanical hazard is involved, the conductor size shall be
increased to compensate for the hazard or the conductors shall be protected
by covering them with molding or tubing made of wood or nonmagnetic
material. When metallic conduit or tubing is used, the conductor shall be
electrically connected at the upper and lower ends.
2.1.2
Main and Secondary Conductors
Conductors shall be in accordance with NFPA 780 and UL 96 for Class I,
Class II, or Class II modified materials as applicable.
2.1.2.1
Copper
Copper conductors used on nonmetallic stacks shall weigh not less than 170
kg/300 m 375 pounds/thousand feet, and the size of any wire in the cable
shall be not less than No. 15 AWG. The thickness of any web or ribbon used
on stacks shall be not less than No. 12 AWG. Counterpoise shall be copper
conductors not smaller than No. 1/0 AWG.
2.1.2.2
Aluminum
Aluminum shall not contact the earth nor shall it be used in any other
manner that will contribute to rapid deterioration of the metal.
Appropriate precautions shall be observed at connections with dissimilar
metals. Aluminum conductors for bonding and interconnecting metallic
bodies to the main cable shall be at least equivalent to strength and
cross-sectional area of a No. 4 AWG aluminum wire. When perforated strips
are provided, strips that are much wider than solid strips shall be. A
strip width that is at least twice that of the diameter of the perforations
shall be used. Aluminum strip for connecting exposed water pipes shall be
not less than No. 12 AWG in thickness and at least 38.1 mm 1-1/2 inches
wide.
2.1.3
Air Terminals
Terminals shall be in accordance with UL 96 and NFPA 780. The tip of air
terminals on buildings used for manufacturing, processing, handling, or
SECTION 13100A
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