17Th Edition Amend 3 Metal Consumer Units - Cable Entry.

[Chris Warriner]

I'm installing a new metal consumer unit. Regarding the cable entry points, can I use standard nylon cable glands. I cannot find any info in the wiring regs as to what I can or can't use.  Any help gratefully received.

Regards Chris

 

[SLIPSHOD & SLAPDASH]

Wiska make one called sprint. Ref no TKE/P 40. Needs a 40 mm hole snd a nice bit of kit

Here's one i fitted yesterday into a Wylex board



The plastic  plug is to blank the earth hole if not needed



Woops, thats just for the tails but it means Wiska glands will be ok. Another badly written part of the amendment.

 

[Essex1]

No regulation to cover cable entry's into a CU above and beyond what was already there in previous editions/ammendments.

 

[Murdoch]

Why is this in DIY?

 

[Essex1]

Why is this in DIY?

DIY work is legal Clive. Didn't you know?

 

[Murdoch]

DIY work is legal Clive. Didn't you know?

Ha ha. He says he's looked in the regs and that would be a first for a DIYer!

 

[kerching]

Those new Wiska membrane grommets are nice and they grip,the cable as well

Even herr Obersturmbanfuerher Cable said he liked them on the Webinar

 

[Essex1]

it is only a distribution board. What could go wrong?

Where are those LFB CU fire figures again?

Those new Wiska membrane grommets are nice and they grip,the cable as well

Even herr Obersturmbanfuerher Cable said he liked them on the Webinar

I think they are brilliant. Should have been available sooner. Anyone who continues to use a bush and lockring needs their head examined.

 

[SLIPSHOD & SLAPDASH]

Wiska also make an oval hole rubber to to fit the 20-25 mm glands for twin and earths. Only 1 cable per gland though so the board will look like Swiss cheese if you used them

 

[Andy™]

what we need is knock out slots (similar to what is already on most plastic boards etc), put all cables through then a fire rated seal (like this - http://www.screwfix.com/p/lap-twin-flex-outlet-black/49931) to seal the gaps...

 

[Blue Duck]

https://www.tlc-direct.co.uk/Products/TLTEG2.html

 

[sprocketflup]

Wiska also make an oval hole rubber to to fit the 20-25 mm glands for twin and earths. Only 1 cable per gland though so the board will look like Swiss cheese if you used them

Thats a very good point, there isnt going to be a lot of metal plate left after cutting all them holes, specially if ring circuits are used.

 

[kerching]

what we need is knock out slots (similar to what is already on most plastic boards etc), put all cables through then a fire rated seal (like this - http://www.screwfix.com/p/lap-twin-flex-outlet-black/49931) to seal the gaps...

But do,we ACTUALLY NEED a fire rated seal?

AFAIUI the unit has to be non combustable NOT fire rated.....just saying

I do however agree with you and think it a good idea

 

[Essex1]

But do,we ACTUALLY NEED a fire rated seal?

AFAIUI the unit has to be non combustable NOT fire rated.....just saying

I do however agree with you and think it a good idea

Not according to BS7671 you don't no. Cable entry points into the CU do not have to be fire rated or non-combustible etc...

 

[Sidewinder]

Ok, no need for ANY fire rated cable entries.

The ONLY requirement is IP rating, as per previous regs.

There is NOTHING, in BS7671, nor ANY guidane issued by ANY "scam", the IET, or ANY manufacturer that requires intumescent sealing.

Why?

The reason being, the issue is caused by incompetent installers, installing flammable plasteic consumer units.

The "scams" refuse to sort out their incompetent members because that would mean them admitting their incompetence.

The manufacturers will not admit their incompetence so they have gone with removing the fuel.

 

[Essex1]

To be fair to the manufacturers. If they build an item that meets the specific British Standard then how can they be to blame? Surely it is the standard that needs addressing?

 

[Blue Duck]

To be fair to the manufacturers. If they build an item that meets the specific British Standard then how can they be to blame? Surely it is the standard that needs addressing?

But they didn't & thats part of the problem.

Also wont compression glands melt and fall out? or are we using the rawlplug senario too?

 

[Sidewinder]

To be fair to the manufacturers. If they build an item that meets the specific British Standard then how can they be to blame? Surely it is the standard that needs addressing?

Possibly, however, more likely is HOW the test to the standard is undertaken...

Afterall the manufacturer is self declaring...

 

[NozSpark]

Well,,,, I've been using SBSdave's mini trunking method to allow rear access... Very simple and cheap it is too..

I also enlarge knockouts as needed with a nibbler

 

[Sidewinder]

But they didn't & thats part of the problem.

Also wont compression glands melt and fall out? or are we using the rawlplug senario too?

No, 30 mins is all that is needed, and a "Rawplug" will last 30 mins in masonry.