Discuss Tray and basket bonding in the Commercial Electrical Advice area at ElectriciansForums.net
Are you? Or are you a meter fitter UKPN?Well, there is a statement. Are you an Electrician?
I've actually found (admittedly it was central London) a final circuit with a Zs of 0.17 - with a disconnected PME! So that totally vindicates your point here.My view has always been that if you can't be sure that it is not in contact with anything that could become a hazard, best to bond it.
In fact, even if it is all just screwed to brickwork, etc, if the supply is TN-C-S you might find it is below 22k to true Earth and so might be considered an "extraneous conductive part" as it could give enough of a shock w.r.t. some class I appliance's CPC-bonded metalwork to fall of ladder, etc.
Earth it or bond it?My view has always been that if you can't be sure that it is not in contact with anything that could become a hazard, best to bond it.
In fact, even if it is all just screwed to brickwork, etc, if the supply is TN-C-S you might find it is below 22k to true Earth and so might be considered an "extraneous conductive part" as it could give enough of a shock w.r.t. some class I appliance's CPC-bonded metalwork to fall off a ladder, etc.
It is an exposed conductive part.Earth it or bond it?
Bonding something because your not sure is no reason to bond anything.
The argument about bond/Earth could run and run and often does:It’s an exposed conductive part so earth it it , if it’s not then don’t, it’s extraneous then bond it, it’s not extraneous then don’t.
lumping a quite possibly large protective bonding conductor on to metal work because your not sure is not a valid reason to do so.
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