VIGED310023EN-06

Insulation resistance (R) monitoring

Ungrounded power system require insulation monitoring to identify when the first insulation fault has occurred.

The installation must either be ungrounded or must be grounded through the specific ZX impedence (Commercial Reference: 50159).

In the event of only one earth fault, the fault current is very low and interruption is unnecessary. However, given that a second fault could potentially cause the circuit breaker to trip, an insulation monitoring device has to be installed to indicate the initial fault. This device triggers an audible and/or a visual signal.

By constantly monitoring the insulation resistance, you can keep track of the system quality, which is a form of preventive maintenance.

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