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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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    how hot is it running - 1000 R would pass about quarter of an amp - so if resistive, about 60 watts dissipation. I suggest that unless something is on fire, it is not that.

    I'm with broadgage -if the meter is the old spinning disk type, then the voltage shunt coil will be some henries, but to DC may well give a surprisingly low resistance.

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    how hot is it running - 1000 R would pass about quarter of an amp - so if resistive, about 60 watts dissipation. I suggest that unless something is on fire, it is not that.

    I'm with broadgage -if the meter is the old spinning disk type, then the voltage shunt coil will be some henries, but to DC may well give a surprisingly low resistance.

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