Thread: House to shed power cable size/type

Originally Posted by Judo

Cheers Damien, bee_utey and all.

Once I build some motivation to try pull the new cable through the conduit under the backyard (fingers crossed that works!), I'll join the 2 light circuits on a 10A CB, replace the spare CB for a brand name 32A RCD (bypassing shared RCD).

32A CB, put RCD at sub board in shed

If conduit is 20mm being cheap install it may be, then you will not pull 6mm TPS through, you can however just strip it back to be single insulated and pull it through the conduit, so long as there is no single insulated stuff left exposed anywhere when the job is done

The good news is the conduit is 25mm. phew! That makes me happy!

What's the reason for only using a CB in the house then RCD in the shed? If I do it the other way around, I'm protecting more of the circuit. Is it convenience in case it is tripped while in the shed? Why not run RCD at both main and shed boards? (How mine is now).

Regarding earthing, I'm assuming I don't have an earth pole at the shed (can't see one). Is it standard practice to just use the house earth? Why/when would I have a separate earth pole in the shed?

Use the earth that comes in the 6mm cable. Pain in the backside having to go to the house to reset the rcd, its a sub main feeding a sub board, not necessary to have an rcd protecting the submain. But can never over protect so won't hurt.
Good luck pulling the cable through, will be a two person job, one at either end