Landlords EICR and t&e sub mains without RCD

[Nigel]

For me right now .
Both.
But I'm willing to be persuaded otherwise .. but I'm not yet.

If you need RCDs for basic protection you are in a whole world of trouble and cables in walls is the least of your worries.

 

[mattg4321]

Do you know that the T&E is buried at a depth of less than 50mm?

Maybe you can see that it is, or maybe you're guessing?

I had a similar situation recently. As far as I could see it looked like the cable was always over 50mm deep in the wall, but I couldn't inspect the whole run.

I didn't code it, but listed it in the limitations. You'd hope that the people who installed it 5 years ago would've done it properly...

 

[Nigel]

With tt anyhow
With tncs or tns yes its additional... but it's still a requirement really unless someone can show me something that says different.

It is a requirement. So is brown sleeving on black cables that are live. Does not make it potentially dangerous if it is missing though does it.

 

[vitoboy]

If you need RCDs for basic protection you are in a whole world of trouble and cables in walls is the least of your worries.

Accepted.
Fault

 

[Charlie_]

Is the buried at less than 50mm rule still apply to cables within the prescribed zones?

 

[Wilko]

Is the buried at less than 50mm rule still apply to cables within the prescribed zones?

Yes sir

 

[Andy78]

For me right now .
Both.
But I'm willing to be persuaded otherwise .. but I'm not yet.

Yes in the case of TT then it's different. Like I said my argument is solely for buried twin and earth cables less than 50mm deep.

 

[Wilko]

Just thinking out loud - if the TT was PME’d then at least the sub-main would have fault protection. I did a job recently where SSE had just been through and upgraded the o/h and were able to provide PME.

 

[Charlie_]

Yes sir

10 points to Griffendor!

 

[SparkyAndGeorge]

Would there be much point putting a 100ma RCD upfront of one of these sub mains as it still wouldnt meet the 30ma requirement?

 

[James]

Would there be much point putting a 100ma RCD upfront of one of these sub mains as it still wouldnt meet the 30ma requirement?

in my opinion it would be worth it, especially if it was me that had just put a nail through the cable.

 

[SparkyAndGeorge]

in my opinion it would be worth it, especially if it was me that had just put a nail through the cable.

But both scenarios would warrant a C3 code?

 

[Charlie_]

But both scenarios would warrant a C3 code?

C1 if James’ nail is still sticking out of the cable

 

[James]

C1 if James’ nail is still sticking out of the cable

I always pull them back out again,
quick bit of polyfiller and nobody would know.?

 

[westward10]

Would there be much point putting a 100ma RCD upfront of one of these sub mains as it still wouldnt meet the 30ma requirement?

It is a TT earthing system a 100ma device will provide fault protection.

 

[Mapj1]

For TT surely there must be some kind of RCD up front, as changing to SWA would be worse than useless - a nail connecting to a live wire and to a high Z earth that just makes the building live but trips nothing is worse than a nail on its own that is just live.
If you can beef up the thin bit of wall to 50mm, or maybe make the route un-hidden in some way (metal detector and some labels/paint ? ) then a 100mA or 300mA up front would be my preferred But a long run of any cable on TT without an upfront RCD is asking for trouble, even a few m of meter tail in plastic trunking feels icky.

 

[Bobster]

For TT surely there must be some kind of RCD up front, as changing to SWA would be worse than useless - a nail connecting to a live wire and to a high Z earth that just makes the building live but trips nothing is worse than a nail on its own that is just live.
If you can beef up the thin bit of wall to 50mm, or maybe make the route un-hidden in some way (metal detector and some labels/paint ? ) then a 100mA or 300mA up front would be my preferred But a long run of any cable on TT without an upfront RCD is asking for trouble, even a few m of meter tail in plastic trunking feels icky.

An upfront RCD is not a must, although in most TT situations tt is highly likely. Especially in domestic situations where it is not only needed for fault protection due to low Zs.

I've done a few installations where the Ra is sufficient not to require them.