Shower supply, ever needed additional earth cable.

[westward10]

It is not likely the cpc was inadequate the only time this may apply was when 2.5 cables had 1.0 cpcs on BS3036 30A fuses.

 

[telectrix]

was in 16th, all electrical equipment in bathroom supplementary bonded to each other like spaghetti. ( except the metal windows and bog flush. these were the preserve of D.W. cock something.

 

[ruston]

was in 16th, all electrical equipment in bathroom supplementary bonded to each other like spaghetti. ( except the metal windows and bog flush. these were the preserve of D.W. cock something.

A blast from the past that Tel.

 

[Risteard]

Could be that the T&E had too small a CPC, so required Supplementary bonding for the Zs.

Supplementary bonding is not there to reduce the Zs. It's there to keep the touch voltage at a safe level until disconnection occurs.

 

[Deleted member 26818]

Supplementary bonding is not there to reduce the Zs. It's there to keep the touch voltage at a safe level until disconnection occurs.

That’s supplementary equipotential protective bonding.

 

[Risteard]

That’s supplementary equipotential protective bonding.

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

 

[Deleted member 26818]

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.

 

[Risteard]

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.

 

[westward10]

Strange this is the third thread to walk this path in the last couple of weeks and harks back to the 15th Ed. Nicely summed up by @Risteard.

 

[Deleted member 72666]

'Bondamania' was definitely 15th edition.

 

[l4urence]

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).

 

[Top Cat]

I remember when metal toilet roll holders, metal window frames, towel rails and ducks in the bath (if they were metal) had to be bonded! You could dry your washing off the earth wires!