UK Meter Tails : Do i have a potential issue?

clanky · May 30, 2023

Hello again,
Was looking at installing yet another dedicated consumer box for my EV charger off the henley blocks and i noticed that a meter, which was installed a couple of years ago (outbuildings on the second phase of a split phase supply) has been wired with 16mm tails but with a 100a isolater switch post meter. Should these have been 25mm? The installer (plumber who'd been on a meter course apparently) had no idea what i was going to install downline of this meter so shouldnt have he erred on the safe side?

Rockingit · May 30, 2023

No, the 100A refers to the maximum rating of the switch. Assuming some normalcy here, 16mm tails are rated to 99A so I'd suspect you probably have an 80A incoming fuse.

MJPD29 · May 30, 2023

100A isolator or cutout doesn’t mean anything except it is rated at 100A maximum. Fuse could be 60a or 80a. If so, tails are fine.

clanky · May 30, 2023

Just checked and the main fuse is 100A...one in the middle.

nicebutdim · May 30, 2023

The sticker indicates maximum fuse rating for the cutout. It could contain anything up to a 100A fuse.

clanky · May 30, 2023

Aaah. Ok, that makes a bit more sense thanks!

Uplight99 · May 30, 2023

I’d be more worried about the fact that we have plumbers telling people they’ve been on a meter course and tamper with mains electricity

mainline · May 30, 2023

clanky said:
Hello again,
Was looking at installing yet another dedicated consumer box for my EV charger off the henley blocks and i noticed that a meter, which was installed a couple of years ago (outbuildings on the second phase of a split phase supply) has been wired with 16mm tails but with a 100a isolater switch post meter. Should these have been 25mm? The installer (plumber who'd been on a meter course apparently) had no idea what i was going to install downline of this meter so shouldnt have he erred on the safe side?

Are the tails running or proposing to run through the fabric of the building ?

clanky · May 31, 2023

Uplight99 said:
I’d be more worried about the fact that we have plumbers telling people they’ve been on a meter course and tamper with mains electricity

Apparantly it was a 'thing' with the rollout of smart meters. If you were corgi registered then the suppliers would train you up for electric meters so you could do both in one visit.

clanky · May 31, 2023

mainline said:
Are the tails running or proposing to run through the fabric of the building ?

No, just clipped to the board. I'll pull the main cutout later and see what its rating is to put this to bed.

Uplight99 · May 31, 2023

clanky said:
Apparantly it was a 'thing' with the rollout of smart meters. If you were corgi registered then the suppliers would train you up for electric meters so you could do both in one visit.

Never heard of it

Asking plumbers to do mains electricity sounds like a recipe for disaster. Whoever thought of that idea needs to be sacked. We as electricians aren’t even allowed to touch the meter

clanky · May 31, 2023

Uplight99 said:
Never heard of it

Asking plumbers to do mains electricity sounds like a recipe for disaster. Whoever thought of that idea needs to be sacked. We as electricians aren’t even allowed to touch the meter

This was 5 years ago so maybe things have changed since then. But whatever, nothing surprises me anymore. I lost a job once to a brazilian who'd done a 2 month 'mechatronics' course, I had 15years experience and a degree. Money talks.

UK Meter Tails : Do i have a potential issue?

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