TM 5-852-5/AFR 88-19, Volume 5
equipment enclosure.
ficult to start. Either the lights must remain ener-
c. Low temperature, special alloy steel is fre-
gized continuously during extreme low temperatures
quently used for transformers, circuit breakers and
or provided with integral thermostats to turn on the
other exterior electrical distribution apparatus.
lights when the temperature drops below -22
d. Cold weather starting of street lighting can be
degrees F, the present low limit of the typical ballast
a problem. Mercury vapor lights are especially dif-
manufacturer's ratings.
11-3
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