Opinions please.

[Flanders]

Cant you use a type d mcb

 

[Leesparkykent]

Cant you use a type d mcb

Wont make a difference where discrimination is concerned.

 

[Leesparkykent]

http://edmundson-electrical.voltilink.co.uk/articles/guide-discrimination this is a good read.

 

[Flanders]

Thanks for that lee think i been miss guided in the past was thinking about discrimination for overload not short circuit .

 

[Dave OCD]

Cant you use a type d mcb

It did occur to me ,might be ok on overcurrent 'tripping' on one of the final circuits but in the event of a l-n short it would most likely go at the same time ?

 

[Dave OCD]

Beaten to it again !:biggrin:

 

[Amp David]

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

 

[Leesparkykent]

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]

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]

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]

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.