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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 6-2. Cable maintenance--overheating problems--continued.
Cause of
Remedy
overheating
Installation
Overloading,
Transfer load from
Cables in
overloaded cables to
addition of
underground
cables carrying lighter
loaded cables to
ducts
loads. Place power
duct bank without
cables in outside ducts
reducing the
with most heavily loaded
rating of cables
cables at the corners of
already in bank
bank.
Install ventilating
covers on congested
manholes.
(A fan to force air out
through a ventilating
cover may help).
Wetting dry soil improves
Cables buried
Overloading
its conductivity, and may
in earth.
slightly improve cable
capacity. Only real
remedy is transferring
portion of load to
another circuit.
Reduce load.
Aerial Cables
If practical, shade from
Cable in hot sun.
sun.
Capacity can be increased
15 percent by separating
cables installed in one
ring.
Provide fans to cool
Cable chosen for
Cable Risers
risers during overload
underground
periods.
operation instead
of in a conduit
in air.
Provide ventilating
Heating air
bushing at top of
rising and
conduit.
trapped at top of
conduit.
Shade risers, if
Exposure to sun.
possible.
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