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 Preventive Maintenance Checks and Services
Table 2-1.
S - Semiannually A - Annually
Q - Quarterly
D - Daily W - Weekly M - Monthly
Items To Be
Interval
Item
Procedures
Inspected/
No.
D
W
M
Q
S
A
Serviced
CONTROL CENTERS/SWITCHBOARDS - CONT
(4) If the breaker remains open or closed for a long
Ship
87
q
period of time, it is recommended that
Service/Emer-
arrangements be made to open and close it several
gency
times in succession, p referably under load.
Switchboard
Draw-Out
(5) At all times it is important not to permit pencil
Circuit
lines, paint, oil or other foreign materials to
Breakers -
remain on the insulating surfaces of the breaker
CONT
as they may cause low resistance between points of
different potential and result in eventual
electrical breakdown.
(6) Always inspect the circuit breaker after.
Make the following checks after the circuit breaker has
b.
been deenergized.
(1) Manually operate the breaker several times
checking for obstructions or excessive friction.
(2) Electrically operate the breaker several times (if
breaker has electrical control) to ascertain
whether the electrical attachments are functioning
properly.
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