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46
Connecting Cables
Leak
current lg
Class B
ground
cable
Single-phase/3-wire circuit
Inspection for areas with insulation deterioration
1.
Measure the leak current in the entire circuit and determine whether there is
any short-circuit based on a change in the current. Normally leak current is
measured with the Class B ground cable of the transformer.
Load
equipment
Load
equipment
Leak
current lg
Class B
ground
cable
Insulation
deteriorated
area A
2. If any short-circuit is found, inspect from the power supply to the load using batch
measurement (circuit clamped all at a time).
• If wire insulation deterioration is found at A in the figure, batch measurement a can
detect a leak current but not ’a.
• If loading equipment insulation deterioration is found at B in the figure, batch
measurement b can detect a leak current but not ’b.
Insulation
deteriorated area B
a
’a
b
’b
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