![]() In order to present a risk of electric shock the item must be at Earth potential (that is, in contact with the general mass of the Earth) and, crucially, it must also be accessible (Fig 1).Ī conductive part, such as a metal duct or pipe, that is covered with, or enclosed by, insulating material, or an item that is out of reach (that is, at a distance where simultaneous contact with either exposed-conductive-parts or extraneous-conductive-parts is not possible) will not introduce a potential. Introducing a potentialĪlthough only a conductive part which does not form part of the electrical installation concerned may be an extraneous conductive part, because such an item is conductive does not necessarily mean it is liable to introduce a potential. ![]() ![]() Regulation 411.3.1.2 lists items that require protective bonding, but it should be appreciated that this list is neither exhaustive nor can it be assumed that all the items identified will always fall within the definition of an extraneous-conductive-part.
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