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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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  • 0

    100ma RCCB at the unit
    :
    system is TT

    What's the wiring system between the cut-out and the socket like? Is there a c.p.c. alongside live conductors before the RCCB, either before or within the socket? I'm just wondering about the possibility of earth faults before the RCCB...

    everything within 3 meters of main head

    And does the wiring meet all the DNO's requirements for their fuse providing protection (typically there's a stack of requirements including type of cabling and disposition as well as length) - or failing that BS 7671's section 433/434 requirements for omitting protection (if, lacking the DNO's agreement, the DNO's device technically can't be relied upon) - roughly ≤3m, installed to reduce the of faults to a minimum and risk of fire or danger to persons. Often the DNO's requirements boil down to something very similar.

    does there need to be means of isolation and OCPD between cammando socket and main head?

    Depends on operating requirements... would the customer find it acceptable to have to call out (and pay for) the DNO every time any kind of work is needed on the installation (probably including period inspection - insulation tests etc normally require the circuit to be dead).

       - Andy.

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  • 0

    100ma RCCB at the unit
    :
    system is TT

    What's the wiring system between the cut-out and the socket like? Is there a c.p.c. alongside live conductors before the RCCB, either before or within the socket? I'm just wondering about the possibility of earth faults before the RCCB...

    everything within 3 meters of main head

    And does the wiring meet all the DNO's requirements for their fuse providing protection (typically there's a stack of requirements including type of cabling and disposition as well as length) - or failing that BS 7671's section 433/434 requirements for omitting protection (if, lacking the DNO's agreement, the DNO's device technically can't be relied upon) - roughly ≤3m, installed to reduce the of faults to a minimum and risk of fire or danger to persons. Often the DNO's requirements boil down to something very similar.

    does there need to be means of isolation and OCPD between cammando socket and main head?

    Depends on operating requirements... would the customer find it acceptable to have to call out (and pay for) the DNO every time any kind of work is needed on the installation (probably including period inspection - insulation tests etc normally require the circuit to be dead).

       - Andy.

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