Landlords EICR and t&e sub mains without RCD

[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.