Double pole isolation??????????

[mickytuff]

Got a puzzler here all..........double pole isolation is used in certain circumstances ie immersion switch, shower pullcord etc, but is it a requirement for it to be double pole and where location wise, special location only or other area's, got me thinking......cant find it in the regs book either, please anybody )) reg number would be the icing on the cake.

 

[kingeri]

DP switching is required whenever you need to isolate the appliance - as opposed to single pole (e.g. light switch) when all that is needed is functional switching.

 

[mickytuff]

Come on guys, can anybody help me out on this..................................................................

 

[kingeri]

The extra requirement for bathrooms is the min distance between switch contacts.

 

[mickytuff]

switched spurs and unswitched spurs are normally single pole, i read somewhere that there is a reg regarding the requirement for double pole isolation rather than single pole, its realy buggin me......but thankyou for your reply much appreciated

 

[kingeri]

By switched and unswitched spurs I assume you mean fused connection units. These are double pole.......always....in my experience at least......

 

[kingeri]

The very title of this thread actually begs the question.....are you an electrician? You can't have single pole isolation.....really....can you? I mean, if N is still connected....it's not isolated!

 

[Des 56]

By switched and unswitched spurs I assume you mean fused connection units. These are double pole.......always....in my experience at least......

Maybe not so 13A Single Pole Metalclad Fused Connection Unit C/W Neon Box | Lyon Lighting : A111M | Shop Online with Lyon Lighting :nono:

 

[Geoffsd]

I think the nearest you are going to get is - 537.2.2.5
537.2.1.1 doesn't help and, of course, there is table 53.4

 

[mickytuff]

Thankyou Des 56 and yes i am a fully qualified electician with over 17 years experience, there wasnt a need for that comment Kingeri.

 

[kingeri]

Maybe not so 13A Single Pole Metalclad Fused Connection Unit C/W Neon Box | Lyon Lighting : A111M | Shop Online with Lyon Lighting :nono:

Des, I bow down to your superior knowledge! You're right. I'm wrong. :-------:

However, in any application that I would deploy a switched FCU, I'd want it to be DP. Doesn't matter if it's unswitched, obviously.

 

[kingeri]

Thankyou Des 56 and yes i am a fully qualified electician with over 17 years experience, there wasnt a need for that comment Kingeri.

True, I apologise. Truth is, I was recovering from a huge row with the wife, and for some stupid reason took it out on you. Then I was myself proved wrong. So, I am sorry!!! Truly.

 

[mickytuff]

Not a problem and your apolagy is accepted, so my puzzler continues................anybody else care to have their opinion?

 

[mickytuff]

i do have another puzzler for you, and it is simliar in nature......a single phase board 48 way,(made by ABB) which has been converted by ABB (was a 3 phase board converted to single phase,why i dont know) but the supply to the board is isolated by only breaking the live, and not the neutral-this is connected directly to the main neutral bar, this cant be good practice as the neutral should be isolated like the live via a double pole main isolator, the rating of the isolator is 125Amps, any opinions on this................

 

[Geoffsd]

I'll try again

I think the nearest you are going to get is - 537.2.2.5
537.2.1.1 doesn't help and, of course, there is table 53.4