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Do-It-Yourself (DIY) Question & Answer Forum
earthing back boxes
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<blockquote data-quote="TTbangbang" data-source="post: 18667" data-attributes="member: 1409"><p>Good to think about these questions, my take is that the metal back box (whether for a surface-mounted or flush-mounted accessory) is an exposed conductive part and therefore is required to be earthed. The sparky has to decide whether or not the in-house earthing (adjustable lugs, earthing strap, screw eyelets) on the socket-outlet could be compromised and thus whether or not to add an earthing tail.</p><p></p><p>Whether or not there is RCD protection is not relevant, you would earth as a start and then use an RCD for additional protection in case the earth connection is/becomes ineffective.</p><p></p><p>Supplementary bonding is required under the 17th in certain conditions. See Reg. 701.415.2 e.g. in a TT system</p><p></p><p>Please would someone point out if I've spouted rubbish and :S</p><p></p><p>Blushing</p><p></p><p>Guiness Drink</p></blockquote><p></p>
[QUOTE="TTbangbang, post: 18667, member: 1409"] Good to think about these questions, my take is that the metal back box (whether for a surface-mounted or flush-mounted accessory) is an exposed conductive part and therefore is required to be earthed. The sparky has to decide whether or not the in-house earthing (adjustable lugs, earthing strap, screw eyelets) on the socket-outlet could be compromised and thus whether or not to add an earthing tail. Whether or not there is RCD protection is not relevant, you would earth as a start and then use an RCD for additional protection in case the earth connection is/becomes ineffective. Supplementary bonding is required under the 17th in certain conditions. See Reg. 701.415.2 e.g. in a TT system Please would someone point out if I've spouted rubbish and :S Blushing Guiness Drink [/QUOTE]
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