Discuss Shower supply, ever needed additional earth cable. in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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It is not defined as "supplementary equipotential protective bonding" in BS7671, so I'm unclear as to what point you were trying to make.
Sorry.
Supplementary protective equipotential bonding.

Point is this:
The 16th allowed supplementary bonding to be used where a low enough value of Zs for ADS could not be achieved.
 
Last edited by a moderator:
Point is this:
The 16th allowed supplementary bonding to be used where a low enough value of Zs for ADS could not be achieved.
Yes it did. And so did the 17th. My point was that this was not there to reduce the Zs but to maintain the touch voltage at a safe level until disconnection occurred (even though this would not be within the prescribed disconnection times).

It obviously might result in an improved Zs but this most certainly is not the purpose of it, but merely incidental.
 
I await @westward10 reading guidancen with interest. I think this requirement was killed by RCD's which changed the game. Bonding in the 16th was so misunderstood - people bonded everything, some plumbers still do it today! However working somewhere that has no RCD protection (given the date of install) may require it (not to be removed).
 

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