Meter tail query

[dunny123]

If a fusebox with existing supply tails of 16mm T&E is replaced with a split load CU, do the tails have to be upgraded if the main fuse is 60A ?

The supply for another fusebox supplying the storage heaters is fed via 10mm T&E. (there are 4 heaters, each fed via a 15A fuse)

The length of both existing supply tails is about 6M.

 

[securespark]

6 Metres??

 

[dunny123]

Its a flat. The meter is in the communal hallway.

 

[securespark]

So, inbetween the cutout fuse & the 6m tails, is there a switchfuse?

 

[Steve]

Pictures?

 

[dunny123]

So, inbetween the cutout fuse & the 6m tails, is there a switchfuse?

I know there needs to be a switch fuse, the question was, do the tails have to be replaced, i.e. is there a regulation to state meter tails have to be 25mm ?

 

[Lectrician]

Tails are sized to your load.

If yous small submain is 16mm and 60amp, the subamin and tails can be 16mm.

Similarly for the storage submain - determine the load, if the 10mm can handle this, feed it from a 45amp fuse etc, and use 16mm tails.

People do get shocked for no reason by tails over a certain length - I wish they would realise that this forum is nationwide (actually, worldwide), and that the DNO's across the regions have different rules and regulations. Many do stipulate a maximum length, while others do not.

When we ask our DNO (WPD) what there max length is, we simply get told that the tails are ours, and aslong as we install them to BS7671, they are happy to connect.

 

[securespark]

Apologies for sounding shocked, Lec, however, all the DNO's I've dealt with have had a max tail length (without fusing down) of 3m. Yes, as long as you fuse down, you can go as long as you like.