Opinions please.

[Dave OCD]

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:

 

[Amp David]

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]

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]

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

 

[Leesparkykent]

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]

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]

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]

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]

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.

 

[Dave OCD]

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]

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]

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]

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]

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]

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]

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