3.1.1
Enclosure Penetrations
Enclosure penetrations shall be from the bottom unless the system design
specifically requires penetrations from other directions. Penetrations of
interior enclosures involving transitions of conduit from interior to
exterior, and all penetrations on exterior enclosures shall be sealed with
rubber silicone sealant to preclude entry of water. The conduit riser
shall terminate in a hot-dipped galvanized metal cable terminator. The
terminator shall be filled with an approved sealant as recommended by the
cable manufacturer, and in such a manner that the cable is not damaged.
3.1.2
Interior Electrical Work
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NOTE: Wireline DTS cable should not be used for, or
routed through, Sensitive Compartmented Information
Facilities (SCIFs). The designer will not show any
wireline DTS cable routed through a SCIF. The
designer should check DCID 1/21 for further
direction.
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Except as otherwise specified, interior electrical work shall be installed
as specified in Section 16402 INTERIOR DISTRIBUTION SYSTEM and as shown.
In locations where corrosion and soil conditions are a concern, Contractor
shall seek approval from Government before using steel or rigid galvanized
conduit.
3.1.3
Exterior Electrical Work
3.1.3.1
Underground
Except as otherwise specified, underground electrical and communications
work shall be installed as specified in Section 16375A ELECTRICAL
DISTRIBUTION SYSTEM, UNDERGROUND and as shown.
a. Minimum burial depth for cable shall be 762 mm 30 inches, but not
less than the depth of the frost line.
b. Where direct burial cable will pass under sidewalks, roads, or other
paved areas, the cable shall be placed in minimum 25 mm 1 inch diameter
zinc coated steel, rigid galvanized, or schedule 40 conduit or concrete
encased PVC. Conduit may be installed by jacking or trenching, as
approved.
c. All buried cable shall be placed below a minimum 76.2 mm 3 inch wide
plastic warning tape buried in the same trench or slot. The tape shall
be 300 mm 12 inches above the cable. The warning tape shall be
continuously imprinted with the words "WARNING - COMMUNICATION CABLE
BELOW" at not more than 1.2 m 48 inch intervals. The plastic tape
shall be acid and alkali resistant polyethylene film, 7.62 mm 3 inches
wide with a minimum thickness of 102 micrometers 0.004 inch. Tape
shall have a minimum strength of 12.1 MPa 1750 psi lengthwise and 10.3
MPa 1500 psi crosswise.
d. Transitions from underground cable to aerial cable shall be as
specified in paragraph CONNECTIONS BETWEEN AERIAL AND UNDERGROUND
SYSTEMS in Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL
SECTION 16792A
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