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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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    Is that a galvanized steel coupler between the box and switch?

       - Andy.
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    Is that a galvanized steel coupler between the box and switch?

       - Andy.
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