EICR on a HMO

[leep82]

Firstly hi all not posted for a very long time for one reason or another, hoping to be a little more active on here as and when i can.

As the thread title suggests my query is regarding a HMO that i am currently working on completing and EICR.

First day here today after a previous site visit, the setup is pretty straight forward with 10 rooms in total, each with their own meter/consumer unit.

Each consumer has a total of 3 circuits, shower, sockets and lighting. And each consumer unit is a single phase supply, in turn supplied from the main 3 phase DB via a 63a 60898 type B MCB.

The supply to each consumer unit is in 16mm t&e and this is where it gets interesting. It doesnt seem that at any point the t&e is ran where RCD protection would be required. All in ceiling/loft spaces and clipped direct where it comes down into each meter. However one of the first things i noticed was the c.p.c within the t&e had been cut off.

Further investigation revealed it had been cut at both ends so the t&e sub main had no c.p.c present. Each consumer unit does have what looks like a seperate 10mm c.pc installed and test results confirm that there is an earth present.

Whilst investigating this it became apparent that the separately installed 10mm c.p.c was in fact ran as a ring from the Main DB around to all the consumer units.

Im trying to justify what to code this and even if i need to give any code. Any help/ advice would be most welcome

 

[littlespark]

No code, as you’ve got a cpc… but make a note on the report.

Cpc as part of t&e not big enough for a distribution circuit…. Hence running a separate.
If it had been SWA, it would have been ok.

 

[PS Electrics]

No code, as you’ve got a cpc… but make a note on the report.

Cpc as part of t&e not big enough for a distribution circuit…. Hence running a separate.
If it had been SWA, it would have been ok.

I think the T&E would have been acceptable since this is an HMO not individual self contained flats so no separate bonding at 10mm is required? Of course this also assumes Zs requirements are met.

Just a thought though if there are more than 2 boards not fed by their own main Earthing is this not of some concern? I think they have done it as a ring to mitigate this. With more than 2 boards in a ring you are relying on the earthing through the other CUs and probably it isn't continuous?

Just a thought might be wrong about the above but something about it doesn't seem correct.

 

[DefyG]

As the cable itself has had the cpc cut off at both ends I would enter a C3 as it doesn't offer any protection within the cable if accidentally damaged!
The 10mm if run as a ring and not adjacent to the T&E will offer none.