Using a TT earth where a TN earth already exists

Problems associated with using a TT earth at a location that already has a TN-C-S or TN-S earthing system. This could be for things such as a hot tub, EV charge point or an outbuilding. A TT system must be completely separate from any other earthing system, including connections via extraneous conductive parts shared with other buildings. Earth electrodes cannot be installed where fault currents from other installations could cause a voltage to appear on the TT system.

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