Ring main for outside heaters

[moosey86]

Ok lads, I probably should know this but for some reason I'm seeing it as a bit of a grey area!

Ive got to resupply a very dodgey circuit of outside pub heaters. Basically there is 4 heaters on a ring, but in the box where the ring starts and ends the whole lot is supplied by a 2.5 twin and earth which is spured off a spur which happens to be a smashed single socket in the barn close by!!

So i'm pulling a ring in from the board using singles and conduit and ill pull it through to where the central box is.... But they want to isolate it for the closing hours.

So would a 4 pole isolater with each live and neutral leg from the feed side going in the top of the iso using each terminal (one for each cable) and the load side the same way from the underside be ok? I know there would be no ring whilst the iso is off but there would be no load so I'm thinking no probs....

What's your thoughts chaps?

 

[J@mes]

Can I ask why a two pole isolator wouldn't be acceptable?

 

[Mark_Burgess]

Ok lads, I probably should know this but for some reason I'm seeing it as a bit of a grey area!

Ive got to resupply a very dodgey circuit of outside pub heaters. Basically there is 4 heaters on a ring, but in the box where the ring starts and ends the whole lot is supplied by a 2.5 twin and earth which is spured off a spur which happens to be a smashed single socket in the barn close by!!

So i'm pulling a ring in from the board using singles and conduit and ill pull it through to where the central box is.... But they want to isolate it for the closing hours.

So would a 4 pole isolater with each live and neutral leg from the feed side going in the top of the iso using each terminal (one for each cable) and the load side the same way from the underside be ok? I know there would be no ring whilst the iso is off but there would be no load so I'm thinking no probs....

Can you really trust that it wont be tapped into in the future?

Why dont you run it as a radial with a suitably large CSA cable for the current demand you require.

 

[Richard]

I can't say i'v ever seen that before. I would even give it a second thought - definatly wire it as a 4mm or 6mm radial (load depending)

 

[moosey86]

If you use a two pole isolator your effectively taking a ring off a ring. It's like wiring a ring from a socket already on a ring main. But it's the same as using 6mm coz all it's doing is covering the current carrying capacity.

With regards to using 6mm I did want to but I've got loads of 2.5 singles and I want to use them! It's obviously not unsafe and I know that but is it against the regs? I see myself as a bit of a pioneer, I'm gona write my own regs book if anyone wants to buy it?