Mitsubishi Electric C Series Handling And Maintenance page 76

Attention
(1)Voltage of the withstand voltage test
The withstand voltage test shall be performed in
compliance with the table given on the right.
Do not exceed the values given in this table.
Note: Test the operating circuit between the
charging part and earthing ground.
Dielectric strength between contacts built in the
earth leakage relay and between the earth
leakage alarm contacts (ECA and PAL) should
be 1000V respectively.
(2) Measurement of insulation resistance and withstand voltage test
Notice that the following applicable types are subject to the restrictions 1 and 2 below:
Applicable types: Earth leakage circuit breakers.
1 1 1 Measurement of insulation resistance
1 1
A 1000 volt insulation resistance tester cannot be used.
For measuring the insulation resistance a 500 volt insulation resistance tester shall be used.
In portions with a in the following table, the circuit breaker with a insulation switch (MG) can be
measured its insulation resistance when the circuit breaker is opened (OFF).
2 2
2 2 2 Withstand voltage test
Voltage shall not be applied at the portions with ✕ marks in the table. (Should the portions with ✕
undergo erroneously the withstand voltage test, some trip but some others do not. In any case these
portions, if once subjected to the test, shall not be reused.)
Measuring points/test
Between the live parts of the main circuit and earth
Between left - middle, middle - right, and middle - neutral poles
Between left - neutral and right - neutral poles
Between left - middle, middle - right, and middle - neutral poles
Between left - neutral and right - neutral poles
Between line and load terminal
Between the live parts of the main circuit - live parts of the control circuit
Between the live parts of the control circuit - earth
Note) For the MDU breakers, please refer to chapter 4.16
State of handle
Between left - right poles
Between left - right poles
Voltage application time: 1 min.
Main circuit
Rated Test voltage
insulation (AC effective
voltage value)
Ui ≤ 300
2000
300 < Ui ≤ 690
2500
Tests
Insulation resistance test
ON
Auxiliary or control circuit
Rated insulation Test voltage
voltage of (AC effective
operational circuit value)
Uis ≤ 60
1000
2 Uis + 1000
60 < Uis ≤ 690
(Min. 1500)
Withstand voltage test
(Note)
OFF ON
(V)
(Note)
OFF
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