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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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    Interesting. Seems the meter is chief suspect, it is an old spinning one. I was measuring resistance across the terminals because there appeared to be a strand of something across the them that looked like copper, and I thought it can’t be something conductive!. Turned out to be a thread of cotton or something similar.

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    Interesting. Seems the meter is chief suspect, it is an old spinning one. I was measuring resistance across the terminals because there appeared to be a strand of something across the them that looked like copper, and I thought it can’t be something conductive!. Turned out to be a thread of cotton or something similar.

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