Routing of meter tails

[leep82]

hi all any advice on the following scenario much appreciated. I have taken on a rewire from another electrician whos personal circumstances mean he cant finish the project. Majority of the first fix has been completed including the repositioning of the DB. The original DB was situated inside the kitchen base units adjacent to the meter and cut out. I can see why the DB is being moved as it isnt the most accesible of places and a new utility room is being created which is much more suitable. However it is the routing of the new ‘ tails’ that im not 100% comfortable with.

25mm double insulated tails along with a 16mm CPC have been run at low level behind the new kitchen base units before rising up in a PVC trunking to ceiling height. They then run approximately 8mtrs through the joist before again dropping down in a PVC trunking to what will be the new DB position. At no point are they buried in a wall. Personally i would have used 16mm2
T&E but the ceiling is now boarded and skimmed so the customer and builder is very reluctant to drop the ceiling and allow me to do this. The intention is to provide our own overcorrect protection at the origin so as not to be solely relying on the 100a DNO fuse.

Ive searched varies threads looking for an answer or advice so apologies if this has been done to death. Can anyone point me in the right direction of where to look in the regs or offer any other advice

 

[Spark attitude]

Would it not be better to extend the supply via SWA from a DP Switch Fuse?

 

[westward10]

I don't see a problem.

 

[leep82]

Would it not be better to extend the supply via SWA from a DP Switch Fuse?

Would have been another option prior to ceilings being boarded and skimmed although maybe difficult to run a SWA through the joists.

 

[westward10]

What proplem/issue are you seeing.

 

[Pete999]

hi all any advice on the following scenario much appreciated. I have taken on a rewire from another electrician whos personal circumstances mean he cant finish the project. Majority of the first fix has been completed including the repositioning of the DB. The original DB was situated inside the kitchen base units adjacent to the meter and cut out. I can see why the DB is being moved as it isnt the most accesible of places and a new utility room is being created which is much more suitable. However it is the routing of the new ‘ tails’ that im not 100% comfortable with.

25mm double insulated tails along with a 16mm CPC have been run at low level behind the new kitchen base units before rising up in a PVC trunking to ceiling height. They then run approximately 8mtrs through the joist before again dropping down in a PVC trunking to what will be the new DB position. At no point are they buried in a wall. Personally i would have used 16mm2
T&E but the ceiling is now boarded and skimmed so the customer and builder is very reluctant to drop the ceiling and allow me to do this. The intention is to provide our own overcorrect protection at the origin so as not to be solely relying on the 100a DNO fuse.

Ive searched varies threads looking for an answer or advice so apologies if this has been done to death. Can anyone point me in the right direction of where to look in the regs or offer any other advice

These "double insulated tails" the should be described as Insulated and Sheathed tails, I know I'm pedantic

 

[telectrix]

fit a 80A KMF after the meter. then connect existing tails. no problem.

 

[leep82]

I don't see a problem.

Maybe there isnt. I may be looking for one because its not how i would have done it myself. On the surface it all seems ok. Its just the length of those tails and more the fact that they run through the joists like they do

 

[Midwest]

I suppose only one issue is how they have been installed through the joists, but not sure tw&e would solve that.

 

[westward10]

These "double insulated tails" the should be described as Insulated and Sheathed tails, I know I'm pedantic

PVC/PVC conductors, animals have tails

 

[westward10]

Maybe there isnt. I may be looking for one because its not how i would have done it myself. On the surface it all seems ok. Its just the length of those tails and more the fact that they run through the joists like they do

6181Y conductors are no different to T&E with regards to the construction of the insulation and sheathing.

 

[stevethesparks]

Why would the op want to reduce the cabling to 16mm T&E?

 

[Midwest]

Why would the op want to reduce the cabling to 16mm T&E?

To be fair, installing 6242y thru joists is easier than 6181y cable IMO. But then I would of used 6943x cable any way, which is a whole lot more of a sweat.

 

[Midwest]

hi all any advice on the following scenario much appreciated. I have taken on a rewire from another electrician whos personal circumstances mean he cant finish the project. Majority of the first fix has been completed

I know its been covered before here, but have you covered your botty, taking on the completion of someone else's installation?

 

[westward10]

To be fair, installing 6242y thru joists is easier than 6181y cable IMO. But then I would of used 6943x cable any way, which is a whole lot more of a sweat.

Jobs been done for him though.

 

[Midwest]

Jobs been done for him though.

I know, I was just expressing my opinion, before someone challenged my design

 

[leep82]

Thanks for the comments guys, would it be

I know its been covered before here, but have you covered your botty, taking on the completion of someone else's installation?

Fair point raised and if it was sombody who i didnt know from adam then i would be very reluctant to do so. However i have worked with the electrician who has carried out the work so far and am more than comfortable picking it up from him. As things stand the vast majority of his 1st fix is still visible to inspect, its just the route that the new tails take that has been the first area handed over to the plasterer. Would it be worth installing a 100ma time delay RCD as a belt and braces approach?

 

[westward10]

If it is a TN system an rcd is not required.

 

[DPG]

, its just the route that the new tails take that has been the first area handed over to the plasterer. Would it be worth installing a 100ma time delay RCD as a belt and braces approach?

What protection are you giving by adding a 100mA TD RCD though?

And changing to T&E wouldn't improve things over the tails that are there already. Can't see the sense of pulling the celing down.

 

[Midwest]

I'm confused, I understand a distribution circuit only requires disconnection time of 5 secs (411.3.2.3), but does not reg 522.6.202 apply?

Edit; assuming cables are installed below flooring of less than 50mm.