16mm T&E to Consumer Unit

Discuss 16mm T&E to Consumer Unit in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

H

hogey

Afternoon everyone, I've just been to a neighbours house who has just her home completely done up as the foundations are shot. The house has been rewired and in doing so the consumer unit has been moved to one side of the house (the main fuse is outside on the other side of house). I've gone to swap a light fitting over for her and have noticed the elec contractor who's rewired it has used 16mm t&e supply. The cable is buried within the wall so not sure what protection they've used, i might dig out some of the plaster to see. The main fuse is an 80A (the seal has been cut off the fuse carrier so i checked). There are 1 x 10mm for shower, 1 x 10mm for cooker, 1 x 10mm for hob, 3 x ring circuits, 1 x radial and 3 x lighting circuits. The job must have been signed off already and I haven't done any cable calcs yet but it just doesn't sit right with me. Has anyone came across this before? Opinions? Thanks in advance.

Ste
 
How far does the cable run, how is it installed, has it been given circuit protection, where are the main protective bonds connected.
 
It has been rewired within the last 6 months. The cable run must be 15m give or take, bonding comes from the main earth block at meter cupboard, no RCD on the 16mm T&E though (sorry was meant to say that), it's wired into a separate DP iso, i think 100A but will double check.
 
A quick referral to table 4D5, suggests the best ccc for 16mm tw&e is 85a (clipped direct). So with 15m negotiating through the house, can't see how its ever going to suffice? And as it buried in a wall, chances are without earthed steel plate capping, its going to need additional protection

Seen it may a time mind.
 
How is the T&E connected at the origin? Because the way I'm picturing it there will be non-sheathed conductors outside of any enclosure or containment at that point.
 
Hi Guys, sorry haven't had chance to reply... Yes they have taken a separate 16mm earth from main earth block to the C.U. The 16mm T&E goes from a 100A iso just past the meter to the C.U. inside the house, it's not a great job tbh... I'll upload a pic. Point still remains that IMHO 16mm T&E isn't fit for purpose in this instance. I don't really wanna get involved as haven't done any work there and its a ballache to rectify but i guess it's my duty...
 
Ha your not kidding... Can't believe thats someones work thats been put on the customer through the insurance company!! What would you recommend, 25mm SWA on an RCD?
 
When was it done because I would be on to the insurance company. Providing fault protection parameters are met a swa cable, assuming it is installed correctly would not require additional rcd protection.
 
It was wired about 6 months ago. I had a little chip away of the plaster where it comes through the wall, it is in metal capping. Time to bite the bullet today though. The poor women has been through enough with the insurance company, she has fought them for near 10 years to get the foundations and house fixed so this sums them up!!! Would you just use 25mm swa and keep the 100A isolator as the circuit protection?

Thanks again chaps
 
hogey said:
It was wired about 6 months ago. I had a little chip away of the plaster where it comes through the wall, it is in metal capping. Time to bite the bullet today though. The poor women has been through enough with the insurance company, she has fought them for near 10 years to get the foundations and house fixed so this sums them up!!! Would you just use 25mm swa and keep the 100A isolator as the circuit protection?

Thanks again chaps
Click to expand...

An isolator does not provide any protection, it is just an isolator. You need an ocpd.
I doubt that I'd use 25mm SWA unless this was a very large house with a high demand.
A 63A submain with 10mm SWA is normally sufficient for a domestic installation.
 
It's TNS, that's a split concentric cable coming in with the earth strands being brought out of the bottom of the cutout into a separate single pole Henley block (a genuine Henley series 7 one)
That Henley block MET will have been supplied by the DNO.

I've had a couple done exactly like this by SSE on service alterations where they have maintained the TNS service.
 
hogey said:
Afternoon everyone, I've just been to a neighbours house who has just her home completely done up as the foundations are shot. The house has been rewired and in doing so the consumer unit has been moved to one side of the house (the main fuse is outside on the other side of house). I've gone to swap a light fitting over for her and have noticed the elec contractor who's rewired it has used 16mm t&e supply. The cable is buried within the wall so not sure what protection they've used, i might dig out some of the plaster to see. The main fuse is an 80A (the seal has been cut off the fuse carrier so i checked). There are 1 x 10mm for shower, 1 x 10mm for cooker, 1 x 10mm for hob, 3 x ring circuits, 1 x radial and 3 x lighting circuits. The job must have been signed off already and I haven't done any cable calcs yet but it just doesn't sit right with me. Has anyone came across this before? Opinions? Thanks in advance.

Ste
Click to expand...
Under wall heating.
 
OmyDays its normally the supply authority who have a terrible installation, a sub main with no mechanical protection burred in wall with no RCD on a 100a fuse.

I have never seen such a bad consumer install on a new service head, i know what you mean i would just price accordingly mate.
 
This is how my old boss kept on telling the electricians to do it either 16mm T &E down cavity with polystyrene insulation or behind dot and dab although a KMF switch fuse was fitted it often had a 100A fuse fitted. The problem got worse when consumer unit had to be put at part M height yes you've guessed it down wall , I kept on telling him it did not comply the NICEIC kept on telling him in the end we both gave up. Removal from the approval roll .
 
anthonybragg said:
This is how my old boss kept on telling the electricians to do it either 16mm T &E down cavity with polystyrene insulation or behind dot and dab although a KMF switch fuse was fitted it often had a 100A fuse fitted. The problem got worse when consumer unit had to be put at part M height yes you've guessed it down wall , I kept on telling him it did not comply the NICEIC kept on telling him in the end we both gave up. Removal from the approval roll .
Click to expand...
I tell you Murdoch there is nothing funny about working for this guy.
 

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