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I see this a lot on sites where they’ve got an armoured cable with an earthing ring/banjo connecting the armour to an extraneous conductive part. Should there also be main bonding run as well? Common thing I see is cable tray being supplementary bonded of a local isolator usually 6mm or 10mm?
MrJack96:I see this a lot on sites where they’ve got an armoured cable with an earthing ring/banjo connecting the armour to an extraneous conductive part. Should there also be main bonding run as well? Common thing I see is cable tray being supplementary bonded of a local isolator usually 6mm or 10mm?
Interesting. The top of the picture is cut off, but I guess it's only got the switch and plastic box on it, nothing else?
I would have said in this case, it's possibly neither an extraneous-conductive-part, nor an exposed-conductive-part.
It certainly depends on what you term "installation" (definition in Part 2 of BS 7671 is very open to interpretation), and also whether PME conditions (and G12/4) applies, as to whether there needs to be a "main bonding run" from the entire installation MET or not.
MrJack96:
Interesting. The top of the picture is cut off, but I guess it's only got the switch and plastic box on it, nothing else?
I would have said in this case, it's possibly neither an extraneous-conductive-part, nor an exposed-conductive-part.
It certainly depends on what you term "installation" (definition in Part 2 of BS 7671 is very open to interpretation), and also whether PME conditions (and G12/4) applies, as to whether there needs to be a "main bonding run" from the entire installation MET or not.
