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Do-It-Yourself (DIY) Question & Answer Forum
Bonding Required?
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<blockquote data-quote="apprentice87" data-source="post: 369234" data-attributes="member: 13534"><p>Hi KME</p><p></p><p>What sort of supply is the original one?? Reason for asking, is that if you have multiple supplies to a steel framed building, only the one can be TNCS, all the others have to be TT'ed..</p><p></p><p>Reason being; You have ten supplies yes?? all TNCS. Incoming neutrals form the [each] earthing conductor, which is in turn bonded to your shed frame. This means that all the neutral currents for ALL the installations will try to disappear back down which ever particular neutral conductor that happens to have the lowest impedance. The DNO will not allow this sort of thing....</p><p></p><p>The have a list of other rules that are well beyond my capabilities to understand, but here is a link to them!! <a href="http://www.westernpower.co.uk/getattachment/Connections/New-Connections/Supplies-to-Multi-Occupancy-Buildings/SD5C.pdf.aspx" target="_blank">http://www.westernpower.co.uk/getattachment/Connections/New-Connections/Supplies-to-Multi-Occupancy-Buildings/SD5C.pdf.aspx</a></p><p></p><p>john...</p></blockquote><p></p>
[QUOTE="apprentice87, post: 369234, member: 13534"] Hi KME What sort of supply is the original one?? Reason for asking, is that if you have multiple supplies to a steel framed building, only the one can be TNCS, all the others have to be TT'ed.. Reason being; You have ten supplies yes?? all TNCS. Incoming neutrals form the [each] earthing conductor, which is in turn bonded to your shed frame. This means that all the neutral currents for ALL the installations will try to disappear back down which ever particular neutral conductor that happens to have the lowest impedance. The DNO will not allow this sort of thing.... The have a list of other rules that are well beyond my capabilities to understand, but here is a link to them!! [URL="http://www.westernpower.co.uk/getattachment/Connections/New-Connections/Supplies-to-Multi-Occupancy-Buildings/SD5C.pdf.aspx"]http://www.westernpower.co.uk/getattachment/Connections/New-Connections/Supplies-to-Multi-Occupancy-Buildings/SD5C.pdf.aspx[/URL] john... [/QUOTE]
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