Opinions please.

Dave OCD · Feb 7, 2016

I have an extension to wire this week which is a garage conversion comprising a study, shower room and small store area. The supply is TT and I'm intending on running a 16mm sub main from the existing mains position under the suspended floor through the hall in the house and installing a new small CU with RCBOs in the new store area. Due to the earthing arrangements I'll fit an S type 100ma RCD and 60a Switch-fuse [possibly 63a MCB] at the supply end, either seperate units linked by tails or integrated in one unit if I can source something suitable. Do you think these items should be Amendment 3 compliant as I don't think I've seen such a beast yet ? Any pointers to similar recently used kit would be welcome. :smilewinkgrin:

Dave OCD · Feb 7, 2016

Beaten to it again !:biggrin:

Amp David · Feb 7, 2016

What brand of RCBOs you using in the new CU.? Always found DP versions tricky to get

Leesparkykent · Feb 7, 2016

Amp David said:
What brand of RCBOs you using in the new CU.? Always found DP versions tricky to get

SBS do single pole switched neutral RCBOs.

Deleted member 9648 · Feb 7, 2016

Leesparkykent said:
Is it an actually requirement that the door is hinged to shut itself? Just think if you had to install a 3phase board within a domestic property if this was the case.

No,it's not a specific requirement....but for me that is not complying with the intention of the regulation which is a fire resistant enclosure over all 'combustible' components as far as is practical. That is why all Am 3 designed enclosures I've seen have a top hinged metal lid. I wouldn't fit that wylex unit. I take your point about the 3 phase board,but that would easily be overcome by fitting 3 separate single phase DB's if you took the view that a side hinged door was not compliant. I would take that view as the door left open would negate any fire resistance of exposed 'combustible' components.

Leesparkykent · Feb 7, 2016

The hinged lid is a good idea but I've already seen a board installed where the wall was out and the lid ever so slightly stayed open. Imo a catch or similar is better. Edit: What switch fuse would you install? As there doesn't appear to be many on the market atm that meet the requirements.

Amp David · Feb 7, 2016

Leesparkykent said:
SBS do single pole switched neutral RCBOs.

Yeah seen those, only thing that puts me of is is if in the future hes gone bump and cant get them anymore or if you get issues with them further down the line.

Dave OCD · Feb 7, 2016

Amp David said:
What brand of RCBOs you using in the new CU.? Always found DP versions tricky to get

That's a good point, as you've rightly noticed I'm talking about a TT install. I might even go with a small dual RCD board if this proves problematic although single pole switched neutral RCBOs would comply. All a bit OTT when there will be DP isolation upstream and the sockets will all be DP as well as the shower isolator.

telectrix · Feb 7, 2016

what about the fan that you're feeding off the shower through a 10A SP pull cord switch? :willy_nilly:

Leesparkykent · Feb 7, 2016

Amp David said:
Yeah seen those, only thing that puts me of is is if in the future hes gone bump and cant get them anymore or if you get issues with them further down the line.

Customer service from them is very good but I get your point.

Amp David · Feb 7, 2016

Leesparkykent said:
Customer service from them is very good but I get your point.

Have ended up using them twice TBH.

One job i went to do in a church and they'd had a new CU fitted which was all SBS. Sods law when i tried to get hold of one of their RCBOs he was away on holiday.

Leesparkykent · Feb 7, 2016

Amp David said:
Have ended up using them twice TBH.

One job i went to do in a church and they'd had a new CU fitted which was all SBS. Sods law when i tried to get hold of one of their RCBOs he was away on holiday.

Haha typical...he must be earning to much lol.

Dave OCD · Feb 7, 2016

telectrix said:
what about the fan that you're feeding off the shower through a 10A SP pull cord switch? :willy_nilly:

Now then we're not all bodgers you know ! [Seen similar to that done though:biggrin:] The fan will be off the lighting circuit via a 3 pole isolator. :angel_smile:

telectrix · Feb 7, 2016

anyone ever managed to set one of these on fire? i've tried with a blowtorch. it just chars. will not ignite, ergo it's non-combustible. it's a totally different type of plastic to the crap they make CUs from.

[ElectriciansForums.net] Opinions please.

Dave OCD · Feb 7, 2016

telectrix said:
anyone ever managed to set one of these on fire? i've tried with a blowtorch. it just chars. will not ignite, ergo it's non-combustible. it's a totally different type of plastic to the crap they make CUs from.

View attachment 31427

That's what I'd like to use on this job and I know it would be perfectly safe. :mad2:

telectrix · Feb 7, 2016

then use it then. only thing with them is they're designed for incomer at bottom, out at top. can fuse at 40,60,80 or 100A.

ewdit: and the switch is down for ON.

Dave OCD · Feb 7, 2016

telectrix said:
then use it then. only thing with them is they're designed for incomer at bottom, out at top. can fuse at 40,60,80 or 100A.

ewdit: and the switch is down for ON.

And the S type RCD could be right next to it in a nice insulated enclosure but I'd be contravening the regs Tel.... :mad2:

Vitesse · Feb 7, 2016

I used one of these recently on a job. Tails in the top using Wago sprint glands in one knockout. 16mm SWA glanded at the bottom. Comes with 3 fuses and mine had a metal hinged door on it rather than the plastic in the picture.

https://www.tlc-direct.co.uk/Products/CGFS100.html

Only downside is it is a bit big if your tight for space.

Dave OCD · Feb 7, 2016

Vitesse said:
I used one of these recently on a job. Tails in the top using Wago sprint glands in one knockout. 16mm SWA glanded at the bottom. Comes with 3 fuses and mine had a metal hinged door on it rather than the plastic in the picture.

https://www.tlc-direct.co.uk/Products/CGFS100.html

Only downside is it is a bit big if your tight for space.

That could be ideal, could even put the S type RCD in that instead of the 100a DP switch , tin hat on now.

b55.v2 · Feb 7, 2016

my understanding of the new regulation is that only domestic consumer units and "similar switchgear containing OPD's" need to be of a non combustable construction.

a standalone rcd has a completely different British standard / product definition to a c.u. therefore would fall outside the requirement and a pvc enclosure could be continued to be used.

to put it another way , you may find that on a TT arrangement the dno may prefer or even insist on double insulated upfront isolating / rcd enclosures for obvious safety reasons.

davesparks · Feb 7, 2016

b55.v2 said:
my understanding of the new regulation is that only domestic consumer units and "similar switchgear containing OPD's" need to be of a non combustable construction.

a standalone rcd has a completely different British standard / product definition to a c.u. therefore would fall outside the requirement and a pvc enclosure could be continued to be used.

to put it another way , you may find that on a TT arrangement the dno may prefer or even insist on double insulated upfront isolating / rcd enclosures for obvious safety reasons.

Where did you get the 'containing opds' bit from? It doesn't say that in the regs.

A standalone RCD in a 2way enclosure is very similar switchgear to a CU.

Why would the DNO give a monkeys? After their terminals they really don't worry too much unless your tails are too long or you damage their network somehow

Dave OCD · Feb 8, 2016

davesparks said:
Where did you get the 'containing opds' bit from? It doesn't say that in the regs.

A standalone RCD in a 2way enclosure is very similar switchgear to a CU.

Why would the DNO give a monkeys? After their terminals they really don't worry too much unless your tails are too long or you damage their network somehow

The RCD will be going in the same Amd 3 Compliant enclosure as the cartridge fuse, the RCD will take the place of the usual DP switch [100a rated 100ma time delayed] so I'm covered and it'll be a nice tidy solution.

Opinions please.

Dave OCD

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Dave OCD

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Amp David

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Leesparkykent

Deleted member 9648

Leesparkykent

Amp David

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Dave OCD

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telectrix

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Leesparkykent

Amp David

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Leesparkykent

Dave OCD

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telectrix

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Dave OCD

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telectrix

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Dave OCD

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Vitesse

Dave OCD

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b55.v2

davesparks

Dave OCD

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