Discuss Feeding a Shed Cu from the main CU in the Australia area at ElectriciansForums.net
looks good to me. i assume you are taking your cpc for the shed from the MET. if using steel conduit, it should be earthed.
How/where will the plastic conduit be run?
As for time delaying an RCD any s/o etc it protects must still be rated at 30mA in .4s so time delay the one in the house a then circuits within the house aren't protected in a satisfactory way.
Why would after splitting the mains, and installing a 100mA S type RCD to the tails to the shed, affect THE 30mA RCD's in the CU??
Just had a though about this, I was planning to put a 2 way CU in the shed with an RCD but just remembered that I can't have an RCD in the shed unless the main RCD is time delayed.
I take it that you don't have a load of steelwork in contact with the ground (it being a former 20ft lorry back) ?
at last.....someones asked what the earthing arrangements are here.....this will determine wether an s type RCD is required for discrimination purposes.....So you are taking a supply from an existing outbuilding to a massive aluminium structure in direct contact with earth? If so, is your tac room fed from a tncs supply from the house?
i can see this developing into an export..lol......And more importantly, is he going to be standing in a massive extraneous conductive part?
I think people may be keeping out of this one Glenn.....
Why's that then?
Thank you for clearing that up robbo. How far is the lorry/shed from the main CU? Just wondering if 4mm will be adequate as you are feeding it from a 32A supply. Have you done the VD calcs?
Also, regarding the bonding, what spinlondon said.
Have you allowed for the fact that your conduit cables are rated differently to your armoured in your calcs, plus did you say there will be several running together in the conduit, hence temperature factors? Just thinking aloud as it is an assessment job...
I hadn't no, thanks for pointing that out. i will use a 20A in the main CU.
Many thanks
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