Opinions please.

Dave OCD

Dave OCD

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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:
 
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Dave OCD said:
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:
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If it has a suspended floor would it be just as easy to run the new circuits back to the existing CCU position? Split the tails and add in new board at this position or upgrade the existing board if the customers willing to pay. This way would be cheaper and Imo more convenient for the customer by not having a board in a remote position.
 
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f729d86fffe8d3dcb974e99c6cbc6e7c.png
Wylex now make switch fuses for use in a domestic property.
 
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Leesparkykent said:
If it has a suspended floor would it be just as easy to run the new circuits back to the existing CCU position? Split the tails and add in new board at this position or upgrade the existing board if the customers willing to pay. This way would be cheaper and Imo more convenient for the customer by not having a board in a remote position.
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I did think of that Lee but he wants the new bit seperate as it may be a self contained holiday let in the future.
 
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Thanks Lee, not a bad price, I had afeeling it would be more than that ! Still leaves me with the S type RCD to fit and enclose appropriately though, and all this will sit next to an existing insulated CU. :banghead:
 
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Had to fit a couple of Wylex Amd 3 units a couple of weeks ago in an awkward spot at the back of a cupboard, the lids were a pain to fit with the drop down covers and the metal blanks fell out more than once. :mad:
 
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Leesparkykent said:
That's what I mean, I've been quoted similar...most wholesalers seem to be trying to rip the arse out if it. These ones are just as good, do exactly the same job and for under £2...cant complain at that.
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I actually tried a standard 32mm Wiska plastic gland asan experiment with 16mm tails/10mm earth and found the insert squashes/compresses enough to seal it all up pretty well. [It would certainly meet IP4X]
 
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Leesparkykent said:
For the rcd enclosure you might have to use a two way board and a couple of blanks. Cant seem to find anything compliant.
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That's what I'm thinking Lee, tempting to use a small compliant board with the S type as the main switch and a 63a MCB for the sub main, but compared to a fuse it could cause discrimination issues I think. :smile5:
 
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Dave OCD said:
That's what I'm thinking Lee, tempting to use a small compliant board with the S type as the main switch and a 63a MCB for the sub main, but compared to a fuse it could cause discrimination issues I think. :smile5:
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That's the problem as even a 6A mcb will offer none to very little discrimination with the 63A mcb...in an ideal world you would put the distribution circuit on a fuse.
 
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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.
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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.
 
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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.
 
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Amp David said:
What brand of RCBOs you using in the new CU.? Always found DP versions tricky to get
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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.
 
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what about the fan that you're feeding off the shower through a 10A SP pull cord switch? :willy_nilly:
 
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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.

CGMSF100.JPG
 
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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.
 
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Dave OCD

Dave OCD

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If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
United Kingdom
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Practising Electrician (Qualified - Domestic or Commercial etc)
Business Name
Hendry Electrical Services

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