RCD protection for sub-main

chloebear · Jul 30, 2015

I am having to run a large SWA feed cable to a fixed load (45Kw TP). The cable will be run externally but above ground on cable tray.
Do I need to provide RCD protection for the SWA cable at the distribution board end??

Leesparkykent · Jul 30, 2015

chloebear said:
I am having to run a large SWA feed cable to a fixed load (45Kw TP). The cable will be run externally but above ground on cable tray.
Do I need to provide RCD protection for the SWA cable at the distribution board end??

What earthing arrangement do you have?

chloebear · Jul 30, 2015

TN-C-S at the incoming main & main panel board

Leesparkykent · Jul 30, 2015

Then the SWA doesn't need RCD protection. I asked what earthing arrangement it was incase it was a TT system.

Andy78 · Jul 30, 2015

@OP, read up in the regs about the requirements for rcd protection in all situations then get back to the thread would be my advice.

chloebear · Jul 30, 2015

Just posted another question on the site relating to the earthing system at some new distribution boards on the site - maybe you could check that one out??