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Do-It-Yourself (DIY) Question & Answer Forum
Bonding question
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<blockquote data-quote="Ardet R" data-source="post: 466960" data-attributes="member: 30040"><p>The joys of bonding, you have got it in one. The incoming supply for the whole installation is the defining factor as the bonding is all connected back to the MET at origin.</p><p></p><p>Unless the earthing system is divorced from the incoming supply, by making the building a TT system, the main bonding is the same size for the whole installation.</p><p></p><p>I attach a diagram from GN8 showing 35mm² bonding on a remote building (B3) where the sub main to the building is only 25mm² but the incoming supply conductor is 120mm².</p><p></p><p>[ATTACH]9404[/ATTACH]</p><p></p><p>With the incomer as a 200A supply (possibly 70/95mm²) the main bonding csa may well exceed the csa of the armour of the sub main to the workshop.</p></blockquote><p></p>
[QUOTE="Ardet R, post: 466960, member: 30040"] The joys of bonding, you have got it in one. The incoming supply for the whole installation is the defining factor as the bonding is all connected back to the MET at origin. Unless the earthing system is divorced from the incoming supply, by making the building a TT system, the main bonding is the same size for the whole installation. I attach a diagram from GN8 showing 35mm² bonding on a remote building (B3) where the sub main to the building is only 25mm² but the incoming supply conductor is 120mm². [ATTACH]9404._xfImport[/ATTACH] With the incomer as a 200A supply (possibly 70/95mm²) the main bonding csa may well exceed the csa of the armour of the sub main to the workshop. [/QUOTE]
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Bonding question
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