TM 5-683/NAVFAC MO-1161AFJMAN 32-1083
nal connections should be tight and free of corro-
charger. While being charged, a battery produces
sion. If the terminal connections are corroded, they
and emits a mixture of hydrogen and oxygen gases
should be cleaned with bicarbonate of soda. Battery
which is very explosive. Open flames or sparks must
terminals and cable ends should be cleaned thor-
not be permitted in close proximity to the batteries.
oughly. If stranded cable is used it is advisable to
The room or compartment in which operating bat-
teries are located should be well ventilated. Smok-
cut off the corroded end. If this is not possible, the
ing should be prohibited in these rooms or compart-
strands should be separated and cleaned internally.
Any dust accumulation on the battery charger
should be blown off or wiped clean. Ventilation
d. Instrument transformers. Instrument trans-
formers are used to step down a current or voltage
openings should be clear of obstruction. Terminal
in order to operate a meter or a relay. Indoor-type
connections should be checked for tightness. All re-
instrument transformers are normally dry type, ex-
lays, lights or horns for indicating such abnormal
conditions as grounds, loss of AC power supply, and
cept potential transformers (PTs) which may be en-
high or low voltage should be checked to ensure that
closed in compound-filled metal cases. The more
they are operating properly. During maintenance
common transformer constructions have the com-
outages of the AC supply, there may be times when
plete transformer molded into one solid mass with
it is necessary to provide a temporary supply to the
only the terminals exposed.
I Never open circuit the secondary winding of a current transformer while energized. To do so I
may result in component damage or personal injury.
VENT AND ELECTROLYTE
NEGATIVE (-) TERMlNAL
POSITIVE (+) TERMINAL
Figure 2-11. Large cell for a stationary battery.