NOTE: Provide a "detail" for surge arrester
grounding. See TM 5-811-1/AF AFJMAN 32-1080 for
guidance. For ungrounded and single-grounded
systems, modify paragraph in accordance with IEEE C2
and TM 5-811-1/AF AFJMAN 32-1080.
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Surge arresters and neutrals shall be bonded directly to the transformer
enclosure and then to the grounding electrode system with a bare copper
conductor, sized as shown. Lead lengths shall be kept as short as
practicable with no kinks or sharp bends.
3.10.5
Manhole, Handhole, or Concrete Pullbox Grounding
Ground rods installed in manholes, handholes, or concrete pullboxes shall
be connected to cable racks, cable-pulling irons, the cable shielding,
metallic sheath, and armor at each cable joint or splice by means of a No.
4 AWG braided tinned copper wire. Connections to metallic cable sheaths
shall be by means of tinned terminals soldered to ground wires and to cable
sheaths. Care shall be taken in soldering not to damage metallic cable
sheaths or shields. Ground rods shall be protected with a double wrapping
of pressure-sensitive plastic tape for a distance of 50 mm 2 inches above
and 150 mm 6 inches below concrete penetrations. Grounding electrode
conductors shall be neatly and firmly attached to manhole or handhole walls
and the amount of exposed bare wire shall be held to a minimum.
3.10.6
Metal Splice Case Grounding
Metal splice cases for medium-voltage direct-burial cable shall be grounded
by connection to a driven ground rod located within 600 mm 2 feet of each
splice box using a grounding electrode conductor having a current-carrying
capacity of at least 20 percent of the individual phase conductors in the
associated splice box, but not less than No. 6 AWG.
3.10.7
Riser Pole Grounding
A single continuous vertical grounding electrode conductor shall be
installed on each riser pole and connected directly to the grounding
electrodes indicated on the drawings or required by these specifications.
All equipment, neutrals, surge arresters, and items required to be grounded
shall be connected directly to this vertical conductor. The grounding
electrode conductor shall be sized as shown. Grounding electrode
conductors shall be stapled to wood poles at intervals not exceeding 600 mm
2 feet.
3.11
FIELD TESTING
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NOTE: Select types to suit project conditions and
delete all others. Delete all paragraphs not
applicable. Tests must be justified.
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3.11.1
General
Field testing shall be performed in the presence of the Contracting
Officer. The Contractor shall notify the Contracting Officer [_____] days
prior to conducting tests. The Contractor shall furnish all materials,
labor, and equipment necessary to conduct field tests. The Contractor
SECTION 16375A
Page 62
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