Crabtree starbreaker CU

[Robbox]

OK, Starbreaker fitted with MCB's, don't know how old it is, but the house wiring is 1964'ish. Coming off the downstairs sockets circuit is a feed to a shed. It has to be all pre 70's since the wiring in the shed is white sheath, red/black. I've looked everywhere for some sort of isolator to the shed feed but cannot locate.
We want to take shed away and that leaves us with a live wire and no way to isolate (aside from the CU) so thinking to wire it into an external 2 gang. Is it essential to use a socket with RCD (since CU has only MCB's)?
Is this something I have to call in an electrician or can I DIY?
cheers

 

[endecotp]

Disconnect the cable at the point where it spurs off from the socket circuit.

 

[ban-all-sheds]

It has to be all pre 70's since the wiring in the shed is white sheath, red/black.

Doesn't mean that - the change to harmonised colours happened on 01/04/2006, but in reality, if a DIYer had old colour cable to hand he could have carried on using it for quite some time after that.

Is it essential to use a socket with RCD (since CU has only MCB's)?

If you want a socket, yes.

Is this something I have to call in an electrician or can I DIY?

If you want a socket then ideally use an electrician as the circuit should be tested to prove that it is safe to use.

 

[stillp]

Is it essential to use a socket with RCD

To do what?

 

[ban-all-sheds]

To install a new socket on a circuit which is not RCD protected.

 

[Robbox]

Thanks for all the answers. I'll buy an RCD protected socket for outside use.
It's not so much I need an outside socket, but fitting a socket seems the easier option than delving into the Crabtree!

 

[stillp]

Why not remove the feed to the shed at the point it's spurred from the socket circuit? Do you mean it's a spur from the CU on the fuse that also feeds the socket circuit?

 

[ban-all-sheds]

Thanks for all the answers. I'll buy an RCD protected socket for outside use.
It's not so much I need an outside socket, but fitting a socket seems the easier option than delving into the Crabtree!

Where does the cable run, such that you can use it to supply a socket when the shed it currently supplies is removed?

What sort of cable is it?

 

[Robbox]

Why not remove the feed to the shed at the point it's spurred from the socket circuit? Do you mean it's a spur from the CU on the fuse that also feeds the socket circuit?

I'm having trouble locating the spur. It's on the downstairs circuit, that much I know. Cable is in conduit and white PVC type.

 

[ban-all-sheds]

Not really suitable for outside use.

How does it get from house to shed?

 

[kai]

Is there a Switch-fuse or isolator before the Crabtree board? If there is, you could turn it off, and open the front of the Crabtree board - you should look for one item...
Does the garage feed run off the B32 breaker serving the downstairs ring final circuit?
If that is the case, you could disconnect the feed at the B32 breaker and isolate it that way.

 

[Iggifer]

Is there a Switch-fuse or isolator before the Crabtree board? If there is, you could turn it off, and open the front of the Crabtree board - you should look for one item...
Does the garage feed run off the B32 breaker serving the downstairs ring final circuit?
If that is the case, you could disconnect the feed at the B32 breaker and isolate it that way.

unlikely to be the case. more likely to be spurred from the nearest socket/fcu to the shed. If you were going to go all the way back to the board, you'd put an extra breaker in

 

[Robbox]

Thanks for all the replies. The conduit runs under patio pavers...so pulling it up is out of the question for now. I think I will join up some more 20mm conduit and terminate with a a suitable weatherproof socket/RCD unit.
BTW, what is best way to weatherproof the entry point of the conduit? Rubber grommet or PVC adaptor? If it's the PVC adaptor, is it male or female?

 

[securespark]

It has to be all pre 70's since the wiring in the shed is white sheath, red/black.

I was using white-sheathed cable in the 80's.

 

[ban-all-sheds]

I'm still using it.