7EN02-0423-02

Insulation resistance (R) monitoring

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

In ungrounded power system, the installation must either be ungrounded or must be grounded using a sufficiently high level of impedance.

In the event of only one ground or 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 an initial fault. This device must trigger 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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