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OCPD

Wiggles01

Hi all, 

EICR

I have a 125a cammando socket protected by a 100a 100ma RCCB at the unit and using the 100a fuses in main cut out as it’s OCPD. 

system is TT

everything within 3 meters of main head

Is the circuit discrimination okay if not how would it be coded? 

I does there need to be means of isolation and OCPD between cammando socket and main head? If so how would it be coded

cheers guys

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    If you mean RCCB, and not RCBO, then really there is nothing to discriminate with. The RCCD== RCD  only picks up earth faults  - as without it you and the DNO would both need one heck of an electrode to blow a 100A fuse promptly - so that and the electrode need  testing, and the 100A fuse only picks up L-N faults.
    Arguable its a pain in the pinny and poor practice if the only fuse is the DNOs, so an RCBO would be much better, but I'm seeing no actual danger here. C3 at most. So long as customer is happy to call out DNO if there is ever an L-N accident with whatever is plugged in - which they may not be.
    Mike.

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  • 0

    If you mean RCCB, and not RCBO, then really there is nothing to discriminate with. The RCCD== RCD  only picks up earth faults  - as without it you and the DNO would both need one heck of an electrode to blow a 100A fuse promptly - so that and the electrode need  testing, and the 100A fuse only picks up L-N faults.
    Arguable its a pain in the pinny and poor practice if the only fuse is the DNOs, so an RCBO would be much better, but I'm seeing no actual danger here. C3 at most. So long as customer is happy to call out DNO if there is ever an L-N accident with whatever is plugged in - which they may not be.
    Mike.

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