Shed/Garden Supply

[jamie.aston]

Hello All,

Just a quickie i hope. Tomorrow i will be implimenting the following and getting my mate (qualified spark) in to check everything, i would ask him but he's in a wedding all weekend and i don't wanna disturb him (probs won't get any sense out of him now anyway).

Supply->RCD->Henley Block->3Core 16mm SWA->Shed CU
Supply->RCD->Henley Block->House CU's (Old Electrics in House, Needs ReWire Later)

I have a TT supply (hense RCD b4 henley block). The run from the House to the Shed is approx 15m and is clipped to wall then ducted under patio (below 3 foot) into shed. House is fitted with Earth Rod outside.

Now for the question - Do i export the Earth from the house or install another earth rod close to shed?

Cheers In Advance
Jambo

 

[Albert]

I would install a new rod to make sure that you will have earth in both parts all the time. Otherwise loosing earth in the house will effect the whole installation.

 

[Taylortwocities]

You must protect the supply line to the shed with a fuse or contact breaker. The RCD will not do this.

The best way is to wire the shed supply to a breaker in the house CU.

Also I assume that the RCD you mention is a 100mA Time Delay RCD and the shed's CU will have a 30mA RCD in it?

 

[jamie.aston]

RCD is 100mA but not sure if it is a TD one (don't think it is, says 100mA, 80A, CAT WEM 80/2), it is the only RCD in the installation atm. I plan on a full rewire and CU sometime in the next 6 months (electrics are really old, no earth in light circuit) where i will be using a overall 100mA TD RDC and 30mA RCD to protect the sockets & shower. No space in my (many) boards atm so is there anyway i can take the shed from the Henley block for now and when i replace the wireing and cu switching the shed to a 63A breaker on the 100mA TD RCD side and fitting a RCD in the shed CU. Pics below of current setup. Also do contactum do a modular 100mA TD RCD?

Another thing, i will be installing an earthing rod at the side of my shed for the shed CU, do i also need to connect the 3rd 16mm core from my swa to the earth terminals at both CU's as a backup?