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Because it is in the HOUSE and running through the fabric of the HOUSE and in the HOUSE equipotential zone...because it’s an extraneous conductive part.....and not with a strap but with an SWA gland 134.1.1
Look you clearly don't seem to realise [or care] that there are many well qualified,highly experienced and dedicated professional electricians on this forum. Nowhere has it been suggested using a strap instead of an SWA gland, although this was common practice for many years and I'd imagine considered acceptable at one time. Of course the armour must be connected to earth, you do realise that we're talking about situations where a seperate CPC is used within the cable ? But I still say that it doesn't state anywhere that the armouring MUST be earthed at the supply end. I've had enough of this nonsense now and won't post any more on this thread.