Equipotential earthing study: equipotential wiring is unnecessary.

K Pui-tse Foong; A Watson; A Avolio; Standards Australia

doi:10.1007/bf03178675

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Equipotential earthing study: equipotential wiring is unnecessary.

K Pui-tse Foong·A Watson·A Avolio·Standards Australia

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Abstract

This study was undertaken to determine the ongoing need for Equipotential (EP) earthing as required in AS/NZS 3003, section 4.4.2. A total of 2279 earth points were tested in four clinical institutions in Body Protected areas (as defined in AS/NZS 3003). Each earth point was tested for potentials existing in the earthing in order to assess whether any potentials exceeded the 100 mV requirement of AS/NZS 3003 for EP earthing. The voltage measured was 1.21 mV +/- 3.59 mV, (mean +/- standard deviation (SD)), with a of 99 % confidence interval between 1.0 mV and 1.4 mV. This study suggests that the requirements for EP earthing in section 4.4.2 of AS/NZS 3003 are unnecessary. It is further suggested that Standards Australia review these requirements with the view of withdrawing them from the Standard.

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K Pui-tse Foong, A Watson, A Avolio, Standards Australia. 2004. Equipotential earthing study: equipotential wiring is unnecessary.. https://doi.org/10.1007/bf03178675

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