MICC cable and earth tag

It is a few years since I used M.I.C.C. cable. When I was working for contacting firms we did not use banjos with M.I.C.C. We would scrape the paint away inside any metal accessory enclosure if it was painted, like a metalclad type socket. We would ensure a good tight termination fit using spanners. Normally we would use a galvanised 20mm conduit coupling up to the metal box. The M.I.C.C. gland would be fitted into the 20mm conduit coupling, the coupling then would be held in place by a 20mm male brass bush. Some firms insisted on having an internal C.P.C. within the M.I.C.C. cable as well as using the outer copper covering. We would terminate this into the earth terminal of any metal boxes. It was assumed that termination to galvanised boxes provided good earthing via the mechanical connection to the box. Some people use star washers to bite through the paint.


Z.

Also of course you can use an M.I.C.C. termination with an earth tail pot. That would provide good earthing to any metal enclosure.

https://www.cef.co.uk/catalogue/products/17543-20mm-earth-tail-seals-for-2l1-5-pack-of-10


Z.

The modern way is probably the  pirahna nut.   example here   Using a banjo sounds as you say, rather like an SWA kit re-purposed for pyro. - I suppose in some odd situations  it may make sense on a box that has an insulating coating that for some reason cannot be breached.   It is unusual,  I certainly don't think I have ever seen it, and would not be keen to do it.

now discontinued, there were pre made 20mm washers with a choice of 1.5mm or 2.5mm earth tail. Great for retrofit . Were sold in packs of ten. Tried to get some more  few years back, no longer produced due to lack of demand. I suppose an SWA banjo could be a substitute, if the pot has not got an earth tail.

Remember the gland may be into an insulated enclosure or into metal where paint and varnish cannot be removed without completely dismantling everything.