single phasing of 3 phase boards

[hxsarge]

does anyone know the rules about single phasing three phase boards? in the past i have used a henley block to split the supply up into 3, and put a Danger single phase label on the front. i know manufacturers do sell single phasing kits, just wondered if there is anything wrong with doing what i have done in the past?

im currently working on a large 5 bed detached house with several out houses and a large office/garage. at the customers request, and a good idea for the rich, each room has its own radial circuit, be it a 20a 2.5, or a 32a 4mm. also each room has its own lighting cct. and yes thats a hell of a lot of rcbos when you take into account the 2 ovens and 2 showers, plus out houses. Im using a kq db.

cheers andy

 

[ProDave]

I can't see anything wrong. Do you even need to label anything? Having all 3 phases of the board on the same phase makes it less hazardous than when wired as a 3 phase board, so I can't see an issue at all.

 

[hxsarge]

yea thats what i thought, although i noticed i went back to that 1st job the other month to find a local authority sub contractor had wired a new spur for a stair lift and noted on the cert that the voltage was 400v and it was a 4wire 3phase supply. lol.

 

[ProDave]

yea thats what i thought, although i noticed i went back to that 1st job the other month to find a local authority sub contractor had wired a new spur for a stair lift and noted on the cert that the voltage was 400v and it was a 4wire 3phase supply. lol.

See my views on that in this thread http://www.talk.electricianforum.co.uk/electrician-talk-forum/19321-gs30-approved-voltage-tester.html

He probably doesn't even own a volt meter or have the skill to use it.

But then it should have been bloody obvious. The single phase head and meter should have given him a clue.

I think I should quit reading the forum. I just keep reading about stupidity like this, and at the same time stupid rules for those that actually know something. : headbang

 

[hxsarge]

yes especially when you consider the local subby was a well known large niceic firm and not just your average dope.

 

[Manator]

As long as each single phase board is set up so that no two phases can be installed in the same vincinity I see no problem with what you have done. Distribution of power is normally acheived this way either single or 3 phase. I prefer to use 3 phase when its installed as it gives me more flexability in design.

 

[ProDave]

As long as each single phase board is set up so that no two phases can be installed in the same vincinity I see no problem with what you have done.

I think you missed the point.

He's used a 3 phase board on a single phase install, with the single phase available feeding all 3 phases of the board.

This is a convenient way to get a MUCH larger single phase board than otherwise normally available, due to the customers requirement for a lot of circuits.

 

[Manator]

I think you missed the point.He's used a 3 phase board on a single phase install, with the single phase available feeding all 3 phases of the board.

This is a convenient way to get a MUCH larger single phase board than otherwise normally available, due to the customers requirement for a lot of circuits.

I use the same method from time to time. However the OP stated that he used an Henley to split into three, from this I thought it was a 3 phase supply but distributed individually through distribution boards as single phases. I could be wrong though,I often am.