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I'm after some clarification please? We have a TT system with an RCD, and as far as i can understand from the 17th regs (411.5) says that the maximum earth loop impedance on a TT system for 230V with a 30Ma RCD installed is 1667. It also says that anything above 200 would be unstable, with...

Have a strange one which i could do with some help with. My Valliant 428 is failing to activate the pump. I know the pump works fine as i've tested it with a 3a plug. However, when wired into the boiler I get an F22 - boiler cable or pump fault - the boiler calls for the pump, however the...