MIL-HDBK-1164
Caution: Remove guards for maintenance only when the machinery is not
in operation.
6.9.1
Motor and Engine Safety. Follow special safety precautions when dealing
with motors and engines. In addition to all the other safety concerns associated with
water distribution (as discussed in other sections), be cautious around electrical
devices and be aware of fire safety guidelines.
6.9.2
Electrical Devices
a)
No safety tool can protect absolutely against electrical shock. Use
plastic hard hats, rubber gloves, rubber floor mats, and insulated tools when working
around electrical equipment. These insulating devices cannot guarantee protection,
however, and no one using them should be lulled into a false sense of security.
b)
Electrical shocks from sensors are possible in many facilities, such
as pumping stations, because many instruments do not have a power switch
disconnect. It is important to tag such an instrument with the number of its circuit
breaker so that the breaker can be identified quickly. After the circuit breaker has been
shut off, tag or lock the breaker so other personnel will not re-energize the circuit while
repairs are being performed. Even after a circuit is disconnected, it is good practice to
check the circuit with a voltmeter to be certain that all electrical power has been
removed. Make sure switches are locked open and properly tagged when personnel
are working on equipment. Use fully enclosed, shockproof panels when possible.
Such equipment should be provided with interlocks so that it cannot be opened while
the power is on.
c)
Use extreme care in working around transformer installations.
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