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New sub board for shed swa advice.

Discuss New sub board for shed swa advice. in the Electrical Forum area at ElectriciansForums.net

Jcamerz

New EF Member
Hi guys new to the forum after bit of advice. My family are installing a new shed in the garden and require a lot of power ie few sockets, lights. I am planning of running a swa fed from 32a mcb from the main board to a sub board.
Have a question-
Shall I install the new 32a mcb in the main board on the RCD side or main switch side?
Thanks
 

Dillb

Electrician's Arms
What does it tell your copy of BS7671 about the installation method of the cable needing RCD protection?
 
L

LankyWill

I agree with above but as a general rule it is better to use a cable which omits RCD protection on the distribution side. Just think if something trips in the shed it’s going to take all of the other RCD protected circuits out along with it. Install RCD protection in the shed to cover final circuits.
 
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johnduffell

Regular EF Member
are you planning to earth the swa armor and if so what is the design earth loop impedence via the armor at the far end? also what Type is the MCB you are planning to use?
 

Pete999

Forum Mentor
are you planning to earth the swa armor and if so what is the design earth loop impedence via the armor at the far end? also what Type is the MCB you are planning to use?
 

Pete999

Forum Mentor
are you planning to earth the swa armor and if so what is the design earth loop impedence via the armor at the far end? also what Type is the MCB you are planning to use?
You should always earth the Armour
 

Murdoch

Electrician's Arms
What’s the earthing arrangement ?

Part p ?........
 

johnduffell

Regular EF Member
You should always earth the Armour
I was not suggesting that they shouldn't, but I'm sure there's a lot of SWA with no earth on the armour.
You wouldn't get any of the benefits of SWA but you'd still get the cost, so it'd be pointless to install RCD protected SWA where normal multi core cable would be allowed.
 

Jcamerz

New EF Member
Thanks for the replies guys, I was planning on using swa because because it's going to be run external but clip direct not buried at any point.
I did think RCD only at the sub board would be the best setup.
Earthing arrangement is TN-CS
Now the issue with earthing the armour is the main board is plastic so the 'o ring' would be useless but it will be done on the new sub board. Earthing will be identified using the black core both ends.
 

telectrix

Scouser and Proud of It
Respected Member
clue might be "earthing nut"
 

Strima

Electrician's Arms
73661.jpg
 

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