Mitsubishi Electric AE-SW Series Instruction Manual page 33

2. External view and Internal construction
Please refer to page 3 and 4 of this manual.
3. Preparation before Inspection
For routine inspection under normal service conditions,
proceed with the following.
Make sure that the circuit breaker is turned OFF.
4. Inspection Details
4.1 Initial Inspection
4.1.1 Inspection prior to applying current
Perform the following inspections after installing the ACB and before applying the current.
1. Are the electrical wires and bars fastened securely to the external line connection main terminals?
2. Are any conductive foreign objects, such as screw, nails, processing chips from the panel and also
connecting lead wires for the withstand voltage tests, left around the terminals?
3. Is the front cover, base, etc. cracked or damaged?
4. Has the breaker been flooded or is there condensation of dew?
(1)Follow the standards in 4.1.2 when carrying out withstand voltage test.
(2)Follow the standards in 4.1.2 when measuring the insulation resistance using a 500 V megohmmeter.
4.1.2 Test locations and standards for insulation resistance and withstand voltage tests
(1)Test locations for insulation resistance and withstand voltage tests.
Test locations
Between the live parts of the main circuit and earth
Between live parts of different poles
Between main upper terminals and lower terminals
Between the live parts of the main circuit and the control circuit terminal block
Between the control circuit terminal block and earth
(2)Standards for insulation resistance and withstand voltage tests
Insulation Resistance Test : Must be no less than 5 MΩ. (must be no less than 50 MΩ for the ACB alone)
Withstand Voltage Test AC :
Between the live part of the main circuit and the earth
Between live parts of different poles
Voltage
Between main upper terminals and lower terminals
Application
Between the live part of the main circuit and the control circuit terminal block : 3500 V AC
Time : 1 min.
Between the control circuit terminal block and earth
(The section of dielectric test forbidden shall depend on the instruction on the control circuit terminal label)
Disconnect the UVT voltage input wires "D1", "D2" during withstand voltage test of panel board, otherwise UVT controller
may be broken. (In the case of 380-460 V spec., remove the voltage input wire "IN1", "IN2" of UVT external unit)
CAUTION
Do not drawout the
circuit breaker when
the indicator shows
ON. (see page 13)
Inspection item
Insulation resistance test
CAUTION
Must be tightened at the designated tightening torque
(M12 screw : 40~50 N . m)
Must be removed completely.
There must be no cracks or damage.
There must be no flooding or dew condensation.
Withstand voltage test
ON OFF ON
Criteria
OFF
: 3500 V AC
: 3500 V AC
: 3500 V AC
: 2000 V AC
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