b. Specify next higher cable voltage rating.
Utility company research indicates that the greater
dielectric strength is effective.
c.
Specify full concentric neutral.
d. Specify animal guards around existing concrete
pads. Animal guards include fences, and also guards
to close holes in concrete pads.
e. On new installations, specify buried fiberglass
pads that animals cannot get under.
f.
Avoid toxic chemicals.
g. Specify fenced enclosure where required.
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[Animal guards shall be installed as shown.] [Buried fiberglass pads shall
be installed as shown.]
3.2.5
Electric Manholes
Cables shall be routed around the interior walls and securely supported
from walls on cables racks. Cable routing shall minimize cable crossover,
provide access space for maintenance and installation of additional cables,
and maintain cable separation in accordance with IEEE C2.
3.2.6
Busway Installation
Busways penetrating walls shall have wall flanges installed on both
surfaces of walls. Wall openings shall be approximately 6.4 mm 1/4 inch
larger than the busway on each of the 4 busway sides, and openings shall be
sealed with a suitable compound. Fire barriers shall be provided when
penetrating fire rated walls. Fire barriers shall have a rating equal to
the fire wall rating. A weather barrier shall be used when a busway
penetrates an exterior wall. Busways shall be supported at intervals not
exceeding 3 m 10 feet and shall be braced to prevent lateral movement.
3.3
CABLE JOINTS
Medium-voltage cable joints shall be made by qualified cable splicers only.
Qualifications of cable splicers shall be submitted in accordance with
paragraph SUBMITTALS. Shields shall be applied as required to continue the
shielding system through each entire cable joint. Shields may be
integrally molded parts of preformed joints. Shields shall be grounded at
each joint or in accordance with manufacturer's recommended practice.
Cable joints shall provide insulation and jacket equivalent to that of the
associated cable. Armored cable joints shall be enclosed in
compound-filled, cast-iron or alloy, splice boxes equipped with stuffing
boxes and armor clamps of a suitable type and size for the cable being
installed.
3.4
FIREPROOFING
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NOTE: Refer to TM 5-811-1/AF AFJMAN 32-1080 for
guidance regarding flameproofing of cables in
manholes.
SECTION 16375A
Page 53
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