Can anyone identify these meter tails?

Chris Sparks · Mar 17, 2022

Evening,

Carried out EV charger installation survey today & found this meter. Is that a 16mm concentric type cable adapter between cutout & meter?
This is a TT installation, tails unprotected. Not sure about installation method of DNO supply.
I'd like to upgrade tails to 25mm between cutout & meter, looks like the tails adapter can be removed & replaced with standard tails?

Also - meter is only rated for 80A, unsure of cutout fuse size.

Maybe easier to have smart meter fitted & convert to TNC-S

[ElectriciansForums.net] Can anyone identify these meter tails?

westward10 · Mar 17, 2022

It is a concentric cable. You have no right to interfere with that cable.

Petej999 · Mar 17, 2022

Chris Sparks said:
Evening,

Carried out EV charger installation survey today & found this meter. Is that a 16mm concentric type cable adapter between cutout & meter?
This is a TT installation, tails unprotected. Not sure about installation method of DNO supply.
I'd like to upgrade tails to 25mm between cutout & meter, looks like the tails adapter can be removed & replaced with standard tails?

Also - meter is only rated for 80A, unsure of cutout fuse size.

Maybe easier to have smart meter fitted & convert to TNC-S

View attachment 96130

Yes I had some like these just last week but can;' be that sure they are the same as the ones I used.

Chris Sparks · Mar 17, 2022

Ok interesting thanks. Explains that.
Not much point in uprating them since the meter is only rated for 80A. Looks like I'll have to get the DNO involved and wait for eternity.
In the meantime, I can fit an import limiter to the EV charger.

timhoward · Mar 17, 2022

Might be a camera angle thing but that looks like it might be the top of a clamp where the earthing conductor vanishes into floor.
Have you checked any Zs readings yet?

littlespark · Mar 18, 2022

The outgoing live wrapped in tape doesn’t look so great either.

The fuse is 100A, and the concentric running from fuse to meter looks no smaller than the incoming supply cable… so I don’t think it will need upgraded.
Just get on with what you need to do.

Julie. · Mar 18, 2022

littlespark said:
The outgoing live wrapped in tape doesn’t look so great either.

The fuse is 100A, and the concentric running from fuse to meter looks no smaller than the incoming supply cable… so I don’t think it will need upgraded.
Just get on with what you need to do.

Doubt very much that the fuse is 100A, that meter has a max rating of 80A so it is likely to be a 80A fuse maximum, but could be 60A, given the age, most likely 80A

littlespark · Mar 18, 2022

Julie. said:
Doubt very much that the fuse is 100A, that meter has a max rating of 80A so it is likely to be a 80A fuse maximum, but could be 60A, given the age, most likely 80A

I was just taking the sticker at face value.
Only seen them as “100” or “60/80” in domestic.

Stickers must be there for a reason… as in for filling in the box on an EICR. It’s not like we can pull the fuse to check it’s actual size.

Julie. · Mar 18, 2022

littlespark said:
I was just taking the sticker at face value.
Only seen them as “100” or “60/80” in domestic.

Stickers must be there for a reason… as in for filling in the box on an EICR. It’s not like we can pull the fuse to check it’s actual size.

That's just the rating of the holder.

Sometimes they do have a sticker or label giving the fuse rating, but that's just the maximum for the fuse holder.

timhoward · Mar 18, 2022

littlespark said:
Stickers must be there for a reason… as in for filling in the box on an EICR. It’s not like we can pull the fuse to check it’s actual size.

Oh that life was that simple!
If it says 100 it could be anything.
60/80 = guess which.
60 is the only simple one.
I did find a 40 once!

telectrix · Mar 18, 2022

label says it's llegal and dangerous. so DNO is you first port of call.

pc1966 · Mar 18, 2022

Shame they don't have a transparent window so you can read the fuse rating inside!

Julie. · Mar 18, 2022

pc1966 said:
Shame they don't have a transparent window so you can read the fuse rating inside!

Agree!

I remember the older 13A plugs had a viewing window (from underneath - so it was shielded when live) so you could see the fuse colour - hence the rating.

It would be much better if type 2s and their holders followed a similar system.

Chris Sparks · Mar 18, 2022

Will recommend a meter upgrade + check to see if TNC-S is available to remove issue of TT tails not being RCD protected.
In the meantime - will fit limiter to EV charger.

timhoward · Mar 18, 2022

Chris Sparks said:
Will recommend a meter upgrade + check to see if TNC-S is available to remove issue of TT tails not being RCD protected.
In the meantime - will fit limiter to EV charger.

Don't know if you saw my post above - is it definitely TT?
Hard to tell but that looks like it might be a clamp: