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Topic Title: Consumer Unit hieght and tails?
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Created On: 25 September 2017 08:27 PM
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 25 September 2017 08:27 PM
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Grandfortune

Posts: 392
Joined: 10 April 2007

Hi all,

Been to see me sisters house being built and to have a nose tbh.

I noticed the comsuner unit in the toilet up high, dont they have to be between 1350 and 1450mm, thought it was a reg for new build?.

also saw 16.0mm T&E to the MEB box about 8 mtrs away also with a 16.0mm earth, got a bit distracted but i swear it was capped down a wall with a socket then though the wall, so cant see it having the 50.0mm depth for non RCD.

there are 13 other houses being done so will pop over again and have a closer look, but if i do find the T&E run this way who do you think i should speak to , the foreman? or straight to the spark as i assume he aint RCD protecting it in the MEB box?.


Cheers
Grand
 26 September 2017 07:51 AM
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garywwess

Posts: 17
Joined: 03 April 2017

Hi Grand, unfortunately the disabled in Wales don't have the same rights and privileges as the rest of Britain, being less worthy they don't get the opportunity to access their consumer unit when an mcb trips and have to rely on family or pay someone to climb over the toilet (seems above the bog is the preferred position for builders and architects) to turn the lights back on.. that's the privilege of being self governing.. part M heights only apply to England.. welsh builders can shove them wherever they want regardless of access.. ok rant over... the rcd covering of meter tails I will leave to other more knowledgeable scions of the electrical trade...
gary
 26 September 2017 08:25 AM
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KFH

Posts: 568
Joined: 06 November 2010

Tails are the same as any other circuit as far as I am concerned. If run in T&E they need mechanical protection or RCD protection if less than 50mm from the surface. Metal capping is not considered mechanical protection, SWA is OK. 8 Metres of tails would normally need fault protection additional to the supplier fuse but the builders may have got exemption from the DNO to allow their fuse to protect the long tails. Others will have more knowledge than me if this is possible.

Whether anyone will be interested is a different matter. Building control may be, but if the electrician is self certifying probably not. The electricians registering body may be interested but would probably say they require the customer to complain and then allow the electrician the opportunity to put it right.

You could mention it to the foreman but again I think you will be wasting your time. I would get your sisters solicitor to take the matter up if all else fails to ask why they appear to be not complying with Part Pee of Building regulations. Unless you are in Scotland or NI where it is different.
 26 September 2017 09:06 AM
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stevesmith01

Posts: 14
Joined: 03 July 2013

The latest Approved Doc P 2013 edition states that Doc M doesn't recommend a height for Consumer Units.
Doc M 2015 now states that they are mounted so that the MCB toggles are at 1350-1450mm. Not sure why it hasn't been adhered to.
 29 September 2017 04:53 PM
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anastasis

Posts: 672
Joined: 01 September 2009

I'm not sure how they would terminate T&E into a meter without having exposed single-insulated cores. Perhaps they are running it into a switchfuse in the meter box (not sure the DNO would like that, generally they only allow small isolators like the well-known Wylex REC2).

RCD protection is needed for concealed meter tails - eg see question 1.4 here: http://www.electricalsafetyfir...similar-installations/

You never know, there could be a DP RCBO in the meter box...
 29 September 2017 07:09 PM
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AJJewsbury

Posts: 16117
Joined: 13 August 2003

I'm not sure how they would terminate T&E into a meter without having exposed single-insulated cores

Just to play devil's advocate... that would be OK if the whole thing was within an enclosure accessible only by a tool or key - which there is an argument that a meter box is!

- Andy.
 29 September 2017 09:09 PM
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OlympusMons

Posts: 71
Joined: 05 February 2016

The wall the cable runs down might be due to be battened out and plasterboarded, so might have the required depth. Hopefully wood battens, not metal studded.
Or they might be putting >50mm of render and plaster over it.
Another site visit required I think.
 30 September 2017 08:14 AM
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aligarjon

Posts: 3875
Joined: 09 September 2005

There was a one off new build done by an established local company done it the same way round the corner from me. They had also run the gas bond from the CU so it was under sized. I politely rang their boss and said that the boys had made a mistake and he just hung the phone up. The run to the CU was probably 15m and they just connected the t+e directly into the rec supplied isolator. CU mounted in high kitchen cabinet. Building inspector not doing his job properly either. Bunch of bodgers.

Gary

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