buried tails

[crow11]

just after a bit of advice on buried meter tails, the situation is this is a ground floor flat which as had a fire and needs new lighting circuit new cu and new radial to bedroom and hallway, at the moment the meter is in a outside attached outhouse along with a meter for the upstairs flat both have a separate switched fused isolator the ground floor flat which needs the work as 16mm t&e from the isolator to the cu so I need to put in a bigger earth as it is only 6mm at the mo, cant see how this 16mm t&e is ran to the cu only that is comes in from behind the cu which is on a totally different wall to the outbuilding so it isn't coming down the cavity and at a guess is about 5m in length will find out more on Tuesday when I start the job, if the tails at the moment aren't protected would I have to put a rcd upfront even with them being existing, they are definitely not more than 50mm buried, if so would be a pain for discrimination don't think they would like it much having to go outside to switch back on if it trips, only other option it to run 16mm swa and surface mount cheers

 

[alanl]

What is the query? You want it confirmed that the tails need mechanical protection? Then they do if not RCD'd and buried less than 50mm. Why is the earthing conductor too small? Have you done an adiabatic to see if it can still be used? How are the tails protected now? If they are over 3 metres, then there generally should be some form of protection other than the DNO fuse.

 

[snowhead]

May be the T&E is in steel conduit

 

[odawire]

There should be a switched fuse aswell

 

[snowhead]

There should be a switched fuse aswell

They have

both have a separate switched fused isolator

 

[odawire]

They have

coolio

 

[telectrix]

i'd be inclined to leave the tails as they are if they are undamaged and the 6mm E satisfies the adiabatic. do the necessary work and complete an EIC for the work you have done.

 

[crow11]

cheers all for the replies, yes there is a switched fused isolator in place already, went looking at the flat on Saturday but was a right mess inside due to the fire and everything boarded up so only had head torch and couldn't get to see much, but everything being cleared for tomorrow when I get there, will have the genny with me then so can get some light set up to have a proper look, so hopefully tails will have mechanical protection in place already, was just unsure if I had to rcd protect the tails if there was none in place if I am not replacing them, not done a adiabatic yet could work out I could get away with the 6mm, but running 10mm to services anyway so just as easy to replace the 6mm with 10mm at the same time as the gas is in the same outbuilding as the meter and isolator, all the materials are being provided buy the builder who is doing the other work so all cable along with 10mm already there cheers