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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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    A banjo on the outside of a plastic box probably isn't regarded as best practice either - at least if it's just trapped between the gland and the box (I can't quite see the detail in that one) -  the issue is that plastic is somewhat softer than the steel of traditional enclosures, so can distort over time and result in the contact between the banjo and gland being less that tight. If you have to use a banjo with plastic enclosures the usual advise is to trap the banjo between two lock nuts inside the box so avoiding relying on the plastic to maintain a tight contact - or better still a propriatory "earthing nut" which makes a much better job of making a solid reliable contact with the thread of the gland.


       - Andy.
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    A banjo on the outside of a plastic box probably isn't regarded as best practice either - at least if it's just trapped between the gland and the box (I can't quite see the detail in that one) -  the issue is that plastic is somewhat softer than the steel of traditional enclosures, so can distort over time and result in the contact between the banjo and gland being less that tight. If you have to use a banjo with plastic enclosures the usual advise is to trap the banjo between two lock nuts inside the box so avoiding relying on the plastic to maintain a tight contact - or better still a propriatory "earthing nut" which makes a much better job of making a solid reliable contact with the thread of the gland.


       - Andy.
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