P

pariah66

Hi

As part of a loft conversion to my 2 (now 3) floor flat in a Victorian Terraced house I have added about a dozen 2-gang sockets, a shaving socket, and about 16 downlights to my new floor, plus swapping four pendant lights for 16 downlights in the floor below.

An electrician was installing a new consumer unit today and then I got a call from the head builder who is not onsite. He told me the electrician is concerned that the main service feed coming into the fuse/meter is only 10mm across. The electrician has apparently wired and tested everything (even though he's left the ground floor lights not working) but says we can't turn on the power in the loft as he is not confident the consumer unit will not burn out or the RCDs will be constantly tripping as the mains service cable is too thin.

The head builder told me I will probably have to upgrade my supply. He started advising me to call The National Grid (I think he means UK power networks).

I checked the main feed wire and by my measurements it looks around 12mm across. My builder was saying it should be more like 35 mm across and they'd never seen this before.

I apologise for the lack of detail but that's literally all the information I have aside from two photos of the set-up which are attached.

The reason I am posting is this all seems very light on detail. For instance I would expect a bit more calculation and maybe some figures to justify why we need to shell out many thousands potentially to upgrade the supply. The same amount of people will be living in the house, there are just likely to be a few more lights on and maybe an extra device plugged in.

Could anyone offer any advice about this? Should I just accept it, should I ask UK Power Networks about it, or should I be asking for more detail about how he came to this conclusion (and if so, what?)? Do the photos suggest what we have is obviously wrong? Any pointers would be much appreciated


cheers,
Pariah66

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I have never ever came across a house or flat fed by a 35mm cable it's unheard of. 10 or 16mm is usually correct if in a flat maybe 25 if a house sometimes. Ask him for his calculations as realistically unless you have electric heating or showers there shouldn't be an issue. Do you have electric heating or shower(s)?
 
I have never ever came across a house or flat fed by a 35mm cable it's unheard of. 10 or 16mm is usually correct if in a flat maybe 25 if a house sometimes. Ask him for his calculations as realistically unless you have electric heating or showers there shouldn't be an issue. Do you have electric heating or shower(s)?
 
Who installed the consumer unit?
You do need to get the incoming set up sorted out though.
That pyro needs to be glanded into a proper enclosure and then the tails need to be upgraded.
The dno will possibly insist on the pyro being replaced.
 
You need some compression glands at least on those cables entering the board
 
Sounds like you need to get an experienced electrician involved because from what you have said and shown that is currently not the case.
 
I wonder why he didn't fill in the sticker either
 
From your picture you have several issues which need addressing and an experienced, qualified electrician would have addressed these prior to starting the works. The picture of the consumer unit clearly indicates your so called electrician has limited skills and debatable qualifications.
 
In the meantime do not touch or move any of the existing cables, especially the main incoming pyro cable.
 
Thanks everyone. The electrician just installed the consumer unit. The rest has always been like it.

Am I right that there are two issues here?

1. The pyro (what is this?) needs to be glanded, earthed and tails need to be upgraded. Who would do this, the electrician, the DNO or the electricity supplier?

2. The cables going into the consumer unit need compression glands.

In addition, so far, no-one has seen anything here which suggests I need to upgrade the feed, does anyone know what questions I should be asking this electrician or what calculations I should ask him for?

I'll provide a photo of the top of the CU in the morning as I have no lights downstairs at the moment.
 
Is it just the way the light is catching the dust or does the red insulation look damaged on the supplier side of the cut out in that second picture?
 
An electrician has not installed that consumer unit and as in #15 I would be seriously concerned about other works they have carried out.
 
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We can’t really say if you need the supply from UKPN upgraded, as it’s unclear what the existing capacity is and what your needs are. But it’s likely. This should have been sorted before CU change.
 
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The pyro is a mineral insulated cable with a copper armour, in my opinion the best and my all time favourite..
A competent electrician would be able to sort out the whole set up for you..
The dno would need to be on board though to facilitate the necessary work.

Also looks like the main fuse isn’t clamped..
Do you have a cat??
 
The consumer unit was installed today

Have you payed the electrician for the work?
Have you received any paperwork (electrical certificate) for the work?
 
In answer to various questions (and thanks again to everyone)

- This is part of a loft conversion, the builder subcontracted the electrician.
- This electrician has done all the wiring for the conversion - plugs, lights for the loft floor, smoke alarms and lights in the middle floor.
- There is a problem with loudly buzzing dimmer lights
- I have almost paid the full fee to the builder. The rest of the work has been good with no major issues. This was supposed to be one of the final tasks.
- A part P cert has not yet been provided
- Yes I have two cats.

Obviously I am horrified to read all of this. I will speak to the builder tomorrow but I am wondering if I should get an electrician in to look at this independently.
 
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so, have you received any paperwork (electrical certificate) for the electrical work?
 
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That is exactly what you need an electrician because it would seem the works currently carried out have not been done to the standard of a competent person.
 
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I have a ten year old who could tell you what is wrong with that CU at a glance! It is more an issue than it 'needs a gland', if someone had undertaken that work for me they would never work for me again. If they are that sloppy at the board what is the rest of the installation like?
 
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I recommend you do the Lottery this week.
Of the millions of names you could have picked I believe you're spot on there.:D
 
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New consumer unit, builder says upgrade supply
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