Why do we do it the way we do in the UK?

[Timbo]

Deleted duplicate post.

 

[Timbo]

Trying to attach pics, but keeps duplicating original post.

 

[freddo]

That wire has SHOWOR written on it.

 

[Mikegh]

What is very different though is the use of a 63A B-curve MCB as input isolator.

Certainly I think isolation should always be all-pole (though for TPN that is not so common and ideally then you want a mate first / break last on N) and I was surprised that ROI did not do so in the past.

The use of the MCB to me is kind of mixed, I can see it is a good idea to limit each CU's total current without pushing the DNO fuse in to that job (I presume ROI still has the equivalent of a fuse as ultimate limiter?) but it also seems a bad idea on selectivity as many high current faults will take out both the faulty circuit and the whole damned supply!

63A B-curve instant trip is 189-315A, though looking at the Hager tables it would be selective with a 20A B-curve for socket radial to around 700A. That is still less than often seen for PSSC on sockets here (my experience mostly the RFC, maybe easier at ends of 20A radial though?).

What we have is an MCB at the supply cabinet

Double pole main isolation at the main board
then

Its mostly similar to UK on the boards , heading toward all RCBOs

 

[LastManOnline]

That wire has SHOWOR written on it.

My spelling is gone to pot?

 

[telectrix]

My spelling is gone to pot?

pot or pit?

 

[Julie.]

My spelling is gone to pot?

You've let your English teacher down,
You've let your fellow electricians down,
But most of all

You've let yourself down.....

 

[telectrix]

but his teacher is Irish. ?

 

[Julie.]

but his teacher is Irish. ?

To be sure.

 

[telectrix]

remindsme of the air fungus pilot sends out a mayday. controller asks him his height and location.....

" Oi'm 5 ft 10in. and sitting at the front. of this machine"

 

[Julie.]

remindsme of the air fungus pilot sends out a mayday. controller asks him his height and location.....

" Oi'm 5 ft 10in. and sitting at the front. of this machine"

 

[LastManOnline]

but his teacher is Irish. ?

I am determined to never spell showir incorrectly again

 

[Mikegh]

Just getting round to having a good look at that

DP Isolator and ssd's part of the changes to rules

Bathroom and general lighting now shared on rcbos, single pole(note the sign lol, no ir testing at load terminals, dunno about that likely a backward step imo )

All type A 30ma protection , think Hagers been that way for a while ?

Presume you're fitting control for 2 instantaneous showers?

 

[Mikegh]

That's re:the Hager board lastmanonline fitted. ^^

 

[LastManOnline]

Presume you're fitting control for 2 instantaneous showers?

No. It's just one shower. But from now oni, m going with a Co tractor and running a 10mm straight to shower. I had hoped to have the DB installed today but could, nt start until late afternoon. Anyway have a, peeka at the attached pic

 

[nicebutdim]

Showur.

 

[LastManOnline]

Showur.

I wondered how long it would take for someone to bite. As always you are wide alert.

 

[nicebutdim]

Almost out of vowels, but thankfully I know four of them ?

 

[Mikegh]

No. It's just one shower. But from now oni, m going with a Co tractor and running a 10mm straight to shower. I had hoped to have the DB installed today but could, nt start until late afternoon. Anyway have a, peeka at the attached pic

Ah yes ok but there is a problem with that method and I've seen it in use occasionally

I presume you're running a control pair to a switch to control the supply to the shower

The problem is that unless you break the 10sq supply using an Isolator you're not actually providing local isolation

I would stick with the isolator, a crabtree ceiling mount Isolator works well

 

[LastManOnline]

I presume you're running a control pair to a switch to control the supply to the shower

Yes. There will be an "on/off" control switch outside the door.

The problem is that unless you break the 10sq supply using an Isolator you're not actually providing local isolation

I, ve not heard that particular take on it myself. I do know that this method of installation is becoming increasingly more common. I also think that most 40/50 amp isolators are not adequate for 10mm.