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    Failed RCD in TN-S system

    Greetings all, I have just moved into a new house. The electrical installation seems fairly new. the CU is a Wylex split load. The main switch is a 100 amp/100 ma time delay RCD. The sockets and immersion heater are protected by a 80A/30ma RCD. The earthing system appears to be TN-S ( the...
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