
SEBU8088-06 19
Safety Section
Generator Isolating for Maintenance
i01593543
Gen erator Isolating for
Maintenance
SMCS Code: 4450
When you service an electric power generation set
or when you repair an electric power generation set,
follow the pro
cedure below:
1. Stop the engine.
g00104545
Illustration 13
2. Attach a “DO NOT OPERATE” or similar warning
tag to the engine prime mover starting circuit.
Disconnect the engine starting circuit.
3. Disconnect the generator from the distribution
system.
4. Lock out the circuit breaker. Attach a “DO NOT
OPERATE” or similar warning tag to the circuit
breaker. Refer to the electrical diagram. Verify that
all points of possible reverse power flow have
been locked out.
5. For the following circuitry, remove the
transformer’s fuses:
•
power
•
sensing
•
control
6. Attach a “DO NOT OPERATE” or similar warning
tag to the generator excitation controls.
7. Remove the cover of the generator’s terminal box.
8. Use an audio/visual proximity tester in order to
verify that the generator is de-energized. This
tester must be insulated for the proper voltage
rating. Follow all guidelines in order to verify that
the tester is operational.
9. Determine that
the generator is in a de-energized
condition. Add ground straps to the conductors
or terminals. During the entire work period, these
ground straps
must remain connected to the
conductors and to the terminals.