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Supplementary bonding

MrJack96
ff4dd4e3be3fd92a2860545df50ddca9-huge-5418b436-fc4e-47b3-a594-4fea60cb12cd.jpgI 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?
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    Yeah that’s it just a plastic box and switch. The so reason for main bonding being such a large conductor is due to the earth resistance being taken as fairly low so high fault current? And as to my picture am I right in saying it’s probably been done as if it’s there no body questions it but electrically all they Are doing is making the unistrut live when an earth fault occurs.
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    Yeah that’s it just a plastic box and switch. The so reason for main bonding being such a large conductor is due to the earth resistance being taken as fairly low so high fault current? And as to my picture am I right in saying it’s probably been done as if it’s there no body questions it but electrically all they Are doing is making the unistrut live when an earth fault occurs.
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