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Simple . Think about you going from home to work. you get into your van then drive . what might be on your path(traffic light,stop sign,etc)you get to work.after work u return home using the same road. check the earth loop path in the REG. imagine your house as the transformer, the traffic...

earth loop before testing rcd. earth connection to be confirm first.

Hi Read Reg : 4115.5 to 411.5.4 ,table 41.5 note2 and 415 for RCD. Your breaker need to comply with Zs max.100 ohms is Max value proposed in a draft amendment of BS 7430,Code of Practice for Earthing. Cheers Ousme

You need to understand what you are doing.(TT system ,Ze, max Zs etc...)Do you have GN3 or the 17th edition one? Read and understand the Regs or you will be in trouble when someone get an electric shock from the job you certified.Have you done any electrical edition course?16th, 17th...

hello to everyone. Ousme