Snagging on a new build

Adam_92 · Jul 25, 2024

Just brought a new build and Snaggers have picked a few things

1.no insect mesh in extractor fans which I can’t find in building regs?

2.utility room extractor fan isn’t a humidistat (it’s got an opening window) does it need to be a humidistat or standard is fine?

3. Fuse board (picture attached)

[ElectriciansForums.net] Snagging on a new build

littlespark · Jul 25, 2024

1. Possibly not part of building regs, but it’s a good idea to have them.

2. Standard should be fine, but utility rooms are usually bigger diameter than, say a bathroom. 150mm instead of 100. (Again, not sure if it’s a reg… but every one I’ve come across is on the bigger side)

3. That needs sorted.

Are these you have picked up on, or that the builders snagging team have highlighted?
If a snagging team have brought them up, then that suggests they should be in place by design.

Let them change anything they like, if you get an improvement for free.

New builds are notorious for trades to cut corners. Do some snagging yourself… such as checking the tightness of everything you can find… safely of course!

Power off, switch off the wall… check terminals are tight….Same with a couple of random sockets. I had cables fall out a switch 2 years after buying a new build. (You are badged as trainee, so should be within your skill set… but obviously don’t try anything you’re not confident with!)

Wiggle the taps… check they are tight onto the sink or basin….

Photograph anything you can find that’s not right with time stamp.

If the hole in the consumer unit is anything to go by… it looks like In and out, quick as you can type job.

davesparks · Jul 25, 2024

1 is not in building regs but will probably be in manufacturers instructions and is of course common sense.

2 a humidistat fan in a utility room does not make sense to me, it is not just there to clear water vapour but also smells from cleaning products etc.

3 that should not have had passed inspection and testing with that hole in it!

Adam_92 · Jul 26, 2024

Thanks for the replies,

They come yesterday to fix these issues was told the following

1. Insect mesh isn’t in the home builders spec

2. Not in builders spec

3. Looks like he has cut down a board blank :/ im pretty sure its regs you need to use fire rated grommets? Just can’t find the reg

Pretty Mouth · Jul 26, 2024

Adam_92 said:
3. Looks like he has cut down a board blank :/ im pretty sure its regs you need to use fire rated grommets? Just can’t find the reg

Plastic is fine by regs. Hager do a blanking plate that fits the KO's for meter tails, might fit this one. It could be cut down to fill the gap nicely. Check the dimensions against the knockout though

Meter Tail Entry Closed (Pack 10) • VM04CB | Hager

Find products, Meter Tail Entry Closed (Pack 10) and more on Hager United Kingdom

hager.com

littlespark · Jul 26, 2024

No. Unacceptable.

Is that blanking plate glued down?

Why didn’t they unscrew from the wall and move the entire board to the left so it lines up?

No gromit strip around the hole either.

In fact, on a new build, I would expect no surface wiring at all

Adam_92 · Jul 26, 2024

Thanks

The garage is built into the house and C/U is in garage exactly or fit bigger trunking? Plastic blank moves isn’t stuck in place.

westward10 · Jul 26, 2024

It is a bodge I doubt that meets IP4X.
As @littlespark says the board needs shifting a bit or relocate the trunking.

Adam_92 · Jul 26, 2024

Thanks I will make sure they sort it

Also looking at test results something doesn’t look right with sockets

0.29x1.67=0.48

0.29+0.55= 0.84

0.84/4= 0.21 they have got 0.12 looks like it’s not tested properly to me?

What you guys think

westward10 · Jul 26, 2024

Both ring final circuit readings don't seem correct if you apply text book calculations you would have to test them again. The RCD columns have not been filled in.

Adam_92 · Jul 26, 2024

I’m sure it should be within 0.05 ohms?

Also what do you mean about the RCD

westward10 · Jul 26, 2024

Nothing in the RCD columns before you get to continuity.

littlespark · Jul 26, 2024

Bs 61009 are RCBO’s…. I doubt the trip time for each individual RCBO was exactly 33ms for each one.

Can we get a photo of the CU with the lid open showing the breakers?
We might find they’ve taken a blank out to fill in the hole in the top

timhoward · Jul 26, 2024

Adam_92 said:
I’m sure it should be within 0.05 ohms?

You are right that the little r1 and little rn are expected to be within 0.05 ohms of each other as they are exactly the same wire, and go to exactly the same places. The little r2 would be larger as it's thinner wire, theoretically a factor of 1.66 higher ( 2.5 sq mm / 1.5 sq mm = 1.66 )

The 1st R1+R2 is lower than expected. [ (r1 + r2 ) / 4 ]
The 2nd R1+R2 value has possibly been typed backwards, I'd expect 0.21 and they have 0.12

nicebutdim · Jul 26, 2024

littlespark said:
In fact, on a new build, I would expect no surface wiring at all

Looks to be in a garage judging by the unfinished block wall. Most of the new builds I've recently wired (one off homes) have had a small area for plant and surface trunking is by far the best option when out of general view. Much better to have a suitable surface trunking than 20+ circuits plastered into a wall.

Snagging on a new build

Adam_92

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littlespark

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davesparks

Adam_92

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Attachments

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Meter Tail Entry Closed (Pack 10) • VM04CB | Hager

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Adam_92

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