All of the armoured cable connectors I have seen ground automatically,
because there is a mechanical connection between the cable, the connector,
and the service.
If you mean a separate ground wire, no not needed
I would, for many reasons. If you don't:
It is going to be at some voltage or another.
If the cable is damaged, it could come into contact with the supply and
thus become live. Not a good idea.
If only the outer plastic sheath gets damaged and water gets in, it can
have any old voltage induced in it, wrt ground and galvanic corrosion
could eat the metal away in no time.
If some idiot later assumes it is earthed and connects to it as a safety
earth without checking, boy are they going to be surprised if they get a
The ends of the armoured strands need to have something done with them -
just cutting them off and hoping they won't rub through the conductor
insulation isn't a good plan. Apart from anything else, they are also
there to take any tensile load the cable may have to take. Thus they
normally get clamped to something and usually something metal - which
will need to be earthed. So the armour will be too.
Thanks to all who replied
I should have said that I have a metal junction box at present where the
is earthed but I am proposing to change this to a plastic
junction box, and there will be no earth available for the armour.
Can I safely do this?
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