What size tails to consumer unit?

What size tails to consumer unit?

Typically a customer can have a 100amp 9 way consumer unit with 25mm tails and an additional single way 40 amp mcb or fused consumer unit tailed with 10mm.

What size tails for 100A supply?

25mm tails are compliant with all domestic cut out varieties, whats the problem? Its been 25mm for a while now, all of 16th was 25mm for a 100A TN installation. Some brand spanking new installatons are derated to 80A 1361 main fuse so you can use 16mm on those.

What size tails for 80 amp supply?

16mm is fine on 80 amp if clipped direct or buried in masonry (method C). In duct, trunking or conduit, it would need to be on a 60amp.

How long can my meter tails be?

three meters
Answer: The maximum length of meter tails that can be fitted should meet the requirements of Regulations 433.2 and 434.2 in BS7671: 2008 Amendment 3:2015. Unless the meter tails are installed in such a manner as to reduce a fault to a minimum, they should not be longer than three meters.

Can meter tails be 16mm?

Although most electricity distributors will agree to their cut-out being used the typical maximum length of meter tails is 2 or 3 meters. Generally installed meter tails are 25mm. A smaller diameter such as 16mm would be permitted providing the cut-out fuse is sized in accordance with section 433.1.

What size earth is 16mm tails?

You pick the tails cable size in relation to the main fuse, i.e 100a main fuse is 25mm2 tails and should be 16mm2 earth or 60-80a is 16mm2 and 10mm2 earth….See Also:

Are 16mm meter tails OK?

Who can connect meter tails?

An electrician can provide meter tails and upgrade them when necessary. However, only your electricity supplier can connect the meter tails to your meter and the cut-out/service head. These cables connect the consumer unit to your meter.

Can 16mm tails carry 80a?

I agree with OMS 16mm tails are fine for a 80A incomer. Taking diversity into account 80A is more than enough for most size houses….See Also:

Can I use 16mm meter tails?

What size earth do you need with 16mm tails?

What size is 16mm twin?

Just doing a periodic on some offices, and each office has a small mains unit fed with a piece of 16mm t&e, they are relying on the 6mm earth in the cable for the main earth.

How big does a consumer unit tail need to be?

As the DNO’s fusible link is protecting the meter tails up to the consumer unit(s) and the metering equipment, their regulations govern the size and length of tails that it will protect. Most DNOs specify 25mm² tails with a maximum length of 3m before customer provided overcurrent protection is required.

How big should the tail of a meter be?

My question is what size should the cable be? The tails from the consumer unit are 25mm; the meter to cut out and switch are 25mm. My view is that it should be 25mm as the cut out fuse is 100A.

What should this meter tail size be for a switch?

The tails from the consumer unit are 25mm; the meter to cut out and switch are 25mm. My view is that it should be 25mm as the cut out fuse is 100A. There must be a length limitation on the cable because, assuming a short at the consumer unit, sufficient current must flow to blow the cut out fuse within the specified time.

How big is a 10mm service head tail?

Any 10mm tails on the service provider side are upgraded to 25mm unless older style service heads where only 16mm tails will fit. We can not however renew customer tails to consumer units.