PeatBog
Member
I was Insulation Resistance testing a lighting circuit yesterday. Because of ELV transformers in the circuit I only tested between Line to CPC and Neutral to CPC. I was surprised to get the same value 259Mohms for both. I know that it is quite a respectable value (for an oldish installation) but was surprised that both lines to earth were the same. It kind of indicates a common path to earth? For the insulation in both lines to have degraded at exactly the same rate would be surprising? Or perhaps these are the values "as manufactured"???
Any one have any thoughts? Pete.
Any one have any thoughts? Pete.