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My house has a PME earth system. The gas pipe in the garage has a 6mm earth wire already but I've been told this should be changed to 10mm.I'm having an EV charging point fitted externally which required an earth rod to be installed (32ohms impedance measured)-PME cannot be used with an external EV charging point. Would it be acceptable to disconnect the 6mm PME earth from the gas pipe and connect the 10mm cable to the EVSE earth rod?