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  1. J

    TT system help

    Good evening all. I’m looking for some help with TT system for a caravan site. I have an earth rod at the main supply (mains room). This is a 100mA RCD. From this there is a 10mm swa out to the caravan. The caravan has a 30mA RCD on it. My question is should the caravan have its on earth rod...
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