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RCCB

Northern Spark

Is a resistance of 943 ohms across the incoming terminals of an RCCB normal? This was measured across a Protek T100-100 2TD 100mA RCCB that was in a consumer unit as the incoming isolator switch, using a low ohm resistance meter whilst the RCCB was off and the cut-out fuse was removed. 

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    The observed reading can not be related to the consumers installation as this is isolated by the RCCB being turned off.    It cant be related to the DNO equipment as the cut out fuse was removed.

    That leaves the electricity meter. The observed reading could be the DC resistance of the "voltage" coil in the kwh meter as this is connected across the supply. This coil is highly inductive and the AC impedance will be much higher than 943 ohms.

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    The observed reading can not be related to the consumers installation as this is isolated by the RCCB being turned off.    It cant be related to the DNO equipment as the cut out fuse was removed.

    That leaves the electricity meter. The observed reading could be the DC resistance of the "voltage" coil in the kwh meter as this is connected across the supply. This coil is highly inductive and the AC impedance will be much higher than 943 ohms.

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