Meter Tails Size?

[Thourgood]

Wandering what size tails to use from the meter to my consumer unit.

The 2 way board has a 100amp main switch. 32amp ring circuit and 6 amp lighting circuit both on rcd

I always thought 63/80amp main switch use 16mm and 100amp main switch use 25mm. Just after a bit of clarity as I don't wanna be barking up the wrong tree.

Cheers

 

[Sidewinder]

What is the fuse protecting the tails?

 

[steptoe]

i'd throw a set of 16s in,

but thats just me,

rough as f,,,,,,

what is the maximum demand on the tails?

then chose accordingly, the size of the switch has nothing to do with it,

if your 2 way board had a switch ratted at 400A what size of tails would you use?

 

[ProDave]

I doubt you will be going DIRECT from the meter to a small CU with just 2 circuits will you?

It sounds like an addition to an installation, presumably teed off henley blocks into the tails feeding the existing CU surely?

If so what size are the existing tails? are you planning to replace them?

 

[Thourgood]

Nope it's a brand new supply straight from the cut out just installed by northern power.

Like I said its only feeding 32 and a 6 amp circuit.

 

[Sidewinder]

OK so protective device size at the origin is?

 

[Manator]

Wandering what size tails to use from the meter to my consumer unit.

The 2 way board has a 100amp main switch. 32amp ring circuit and 6 amp lighting circuit both on rcd

I always thought 63/80amp main switch use 16mm and 100amp main switch use 25mm. Just after a bit of clarity as I don't wanna be barking up the wrong tree.

Cheers

Looks like 100 amp main switch, but no idea about the fuse capacity

 

[batty]

Probably need to put in 25mm tails if its a new supply some DNO will not connect if tails are not 25mm EDF now UK power networks won't.

 

[steptoe]

had a major issue with this on the IoM a few years back,

new build site for LA and they specified 25mm tails,

MEA refused to connect them up, apparently they couldnt get anything bigger than 16mm into their meters.! :slap

 

[kerching]

had a major issue with this on the IoM a few years back,

new build site for LA and they specified 25mm tails,

MEA refused to connect them up, apparently they couldnt get anything bigger than 16mm into their meters.! :slap

'electrical haircut' ..................? :coat

 

[steptoe]

40 houses I had to go back and change,

they did agree to us putting a pair of ISCOs in 'their' cabinet and putting in a short link of 16mm from those, CU was inside with external metering so that was the easiest solution,

and, if you knew the MEA you would know that putting ANYTHING in 'their' cabinet is akin to sleeping with their wife and twin 16yo daughters and the same time!

 

[Sidewinder]

Oh God, my twin daughters are 18 next week!

 

[steptoe]

Oh God, my twin daughters are 18 next week!

your wifes nearly 37!

sheesh, I'd a thought her early 30's TBH.

how'd an old codger like you get one so young?!

 

[Sidewinder]

Very nearly worth a de-scoob Mr Toe!

 

[ProDave]

Nope it's a brand new supply straight from the cut out just installed by northern power.

Like I said its only feeding 32 and a 6 amp circuit.

Well I would go for 25mm.But it's a strange installation to limit yourself to JUST a 2 way CU isn't it?

 

[steptoe]

I'll give you one a scoob anyways.

 

[Thourgood]

Well I would go for 25mm.

But it's a strange installation to limit yourself to JUST a 2 way CU isn't it?

I think I'm gonna go for 25mm to be sure. It's only a small office + shop with a few sockets and fluorescents in each. There will never be any need to expand the customer said so a 2 way is fine. I did push towards a 5 way but got shot down.

 

[ProDave]

For the extra minimal cost, I would fit something a bit bigger. The next owner of the shop may curse you (or your client) for specifying something with no room for expansion.

 

[steptoe]

fit a REC2 anyways,

its good practice, and keeps you covered if they ever do decide they need more,

 

[steptoe]

oh, and use a really good 2 way unit, you will find yourself with very little room and the 25mm will want to push it all out of shape.!