earthing micc cable

electrician4u · Apr 19, 2014

just done an EICR where the CU is supplied by a 2 core 6mm MICC CABLE. The main Earth connection was bodged using a copper clip with a bit of 2.5mm cable attached to the outer sheath. Obviously that's coming out. My question is whether it's permissible to use an Earth clamp on the outer sheath to connect to the MET in the CU?

onions1066 · Apr 19, 2014

All different sizes and yes readily available

mechelec · Apr 19, 2014

trev said:
I'd bet a £ to a pinch of pig poop that this MI is nothing to do with the DNO. Someone on the IET forum has picked up the wrong end of the stick.
In 34 years since coming into the trade I have never seen a DNO feed in MI

Really ?? They are very common round here. Usually in council flats, three phase CO in bottom flat and subs fed from this in pyro with single phase CO and meter in each flat. Also seen them looped from the incoming side of a single phase as well.

trev · Apr 19, 2014

mechelec said:
Really ?? They are very common round here. Usually in council flats, three phase CO in bottom flat and subs fed from this in pyro with single phase CO and meter in each flat. Also seen them looped from the incoming side of a single phase as well.

Oh well, I stand (sit) corrected

Engineer54 · Apr 20, 2014

mechelec said:
Really ?? They are very common round here. Usually in council flats, three phase CO in bottom flat and subs fed from this in pyro with single phase CO and meter in each flat. Also seen them looped from the incoming side of a single phase as well.

I've never seen this either. I take it the supply into the 3 phase CO isn't going to be MICC. I bet all those subs were actually provided and installed by the project electrical contractor, rather than the DNO.