Cautionary Instructions For Work - Mitsubishi Electric C Series Handling And Maintenance

1.3 Cautionary instructions for work

Any electric work must be carried out by a qualified person (electrician).
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Before wiring, turn off the upper circuit breaker and make sure of no current conducting.
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Electrification can result.
Procedure 2: (With a detector, make sure
of no current conducting.)
Earth leakage circuit breaker dedicated to single phase 3-wire and three phase 4-wire types,
●
be sure to connect the neutral wire to the neutral phase. Open phase or overcurrent fails
operation and causes fire.
For 1φ, 3-W, connect the neutral wire to neutral
pole
When used for single phase, 3-wire type, connect
the neutral wire to the neutral pole of the earth
leakage circuit breaker.
For 3φ, 4-W, connect the neutral wire to neutral
pole
Connect the earth leakage circuit breaker to the power source suitable for the ratings of the
●
breakers. Connecting to a wrong power can cause malfunction and failure.
3
CAUTION
Procedure 1: Upper circuit breaker
(Turn OFF)
Objective circuit breaker
240V
The neutral wire
120V
120V
The neutral wire
The neutral pole