No CPC’s, conduit doing it’s job, C2 or C3?

JjSparks · Jun 10, 2022

I’ve just done an EICR on an old 2 bed flat that is wired in all metal conduit wired in singles however there are no CPC’s. The conduits are all bushed into the old rewireable board and back boxes/conduit boxes for lights and I’m getting good Zs readings at all outlets through the sockets/lights being fixed into the back boxes/ conduit boxes. There are no fly leads from the boxes to the cpc terminal on any of the sockets/fittings as there are no fixed terminals on the back boxes due to their age. All bonding is in place and I will be upgrading the consumer unit to a new RCBO board. I’m considering putting the fact their are no CPC’s down as a C3 rather than a C2 as it was obviously compliant at the time and I’m achieving compliant Zs readings. Thoughts?

westward10 · Jun 10, 2022

What are you questioning no cpcs to the accessory front plates or no cpcs through the conduits.

7029 dave · Jun 10, 2022

If its a full conduit system and proven earth continuity then the conduit is the cpc.

nicebutdim · Jun 10, 2022

JjSparks said:
I’m considering putting the fact their are no CPC’s down as a C3 rather than a C2 as it was obviously compliant at the time and I’m achieving compliant Zs readings. Thoughts?

What regulation would you cite if coding this?

JjSparks · Jun 10, 2022

westward10 said:
What are you questioning no cpcs to the accessory front plates or no cpcs through the conduits.

The reliance of the fixing screws as the only earth path as no cpc to the face plates/lights.

westward10 · Jun 10, 2022

With power accessories such as socket and fuse connection outlets the cpc is important as would metal be for metal plated light switches but you have to make a judgement as to how detrimental their absence is. How are the light fittings connected to the conduit system.

pc1966 · Jun 10, 2022

If the Zs are compliant then the only question is if the CPC connections are reliable.

7029 dave · Jun 10, 2022

Provision to attach fly lead to lug thats how we used to do it.
For the lighting.

i=p/u · Jun 10, 2022

Just attach fly lead at every accessorie

cliffed · Jun 12, 2022

i=p/u said:
Just attach fly lead at every accessorie

Yea if not it’s a C2 I do believe

Eric12 · Jun 12, 2022

Recently an old customer called me querying an eicr that had a C1 for no cpc in a conduit socket system; she found it odd as the last report from 5 year ago was fine. Had a look at the report and not one zs reading for any circuits; told customer report not worth a #### and to get another. Next report has a C3 for no earth conductor even thou Zs reading all good. I dont do eicr,s but feel I would do a better job of it than some of the carp I see on a regular basis!