3.4
CABLE INSTALLATION
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NOTE: Security and CCTV lighting system conductors
will be buried in areas where the likelihood of
damage to the conductors is slight. In areas where
subsurface utilities are congested and in areas
where the chance of accidental or intentional damage
is great, the security and CCTV lighting system
conductors will be placed in ducts.
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Cable and all parts of the cable system such as splices and terminations
shall be rated not less than 600 volts. The size and number of conductors
and the number of cables shall be as indicated. Conductors larger than No.
8 AWG shall be stranded. Each circuit shall be identified by means of
fiber or nonferrous metal tags, or approved equal, in each [handhole] [and]
[junction box,] and at each terminal.
3.4.1
Splices
Splices below grade shall be made with nonpressure-filled resin systems
using transparent, interlocking, self-venting, longitudinally split plastic
molds. Splices above grade shall be made with sealed insulated pressure
connectors and shall provide insulation and jacket equal to that of the
cable. In order to prevent moisture from entering the splice, jackets
shall be cut back to expose the required length of insulation between the
jacket and the tapered end of the insulation.
3.4.2
Installation in Duct Lines
[Ground] [Ground and neutral] conductors shall be installed in duct with
the associated phase conductors. Cable splices shall be made in handholes
only.
3.4.3
Direct Burial
Minimum cover from top of cable to finished grade shall be 750 mm 30 inches
for direct buried cable, but not less than the depth of the frost line.
3.4.3.1
Trenching
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NOTE: Where soil does not contain rocks or abrasive
material, the requirements for placing protection
over the cable will be deleted. Delete planks if
not required.
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Trenches shall be excavated to the depths required to provide the minimum
cable cover. The bottom of the trench shall be smooth and free of stones
and sharp objects. Where the bottom of the trench consists of material
other than sand or earth, an additional 75 mm 3 inch layer shall be removed
and replaced by a 75 mm 3 inch layer of sand or stone-free earth compacted
to the approximate density of the surrounding firm soil. The cables shall
be unreeled in place along the side of or in the trench and carefully
placed on the sand or earth bottom. Pulling cables into a direct-burial
trench from a fixed reel position will not be permitted. Where cables
cross, a separation of at least 75 mm 3 inches shall be provided, unless
SECTION 16528A
Page 32
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