Splitting 3 Phase Supply

[Steve 82]

Hi,

Got a quick question from a friend who's not a member of this forum, and has a job coming up.

Basically, what is the best method to split a 3 phase supply, so that each phase is supplying an individual fuseboard. Rather than all 3 going to a 3 phase board???

e.g phase 1 will supply fuseboard 1
phase 2 will supply fuseboard 2
phase 3 will supply fuseboard 3

Cheers

 

[mark1979]

3 switch fuses fed off the meter. each individual cu fed from a switch fuse

 

[Steve 82]

ok great. so the neutral from the meter would go to a henley block and then come off that 3 times to the supply sides of each switch fused 100a isolator with the phases too???

 

[mark1979]

yes. simplest way i can think of. are the other cu's remote to the meter? cable runs might have to be taken into account if they are

 

[Steve 82]

basically its like a 10 bed mansion/house which has a 3 phase board at the moment. the customer wants the board on the reverse side of the wall its on now. so cables should be long enough. but he doesn't want a big 3 phase board, he would rather have 3 individual consumer units.
so the runs from the meter will be more or less the same, so volt drop on the wouldn't really come into it.

 

[pennywise]

Why not just put a three phase switch fuse in, then tails to the individual boards, you would have one point of isolation then as well

 

[mark1979]

was thinkin about that but was just thinkinseparate isolation for each board might be handier long term. wasnt thinkin about volt drop but rcd protection if the sub mains were travelling

 

[Steve 82]

yeah that could work too if they dont mind having one point of isolation. so can you come off of that with more than 1 neutral???

 

[Steve 82]

is it something like this what you were talking about???

80A 3 Phase Switchfuse Complete with 3 x 63A & 3x80A Fuses : TP+N Switchfuses : TP+N Switchgear : Switchgear : C & K Supplies

do they do a 3 x 100a version???

 

[Steve 82]

hold on. i think i've found one. 125A 3 Phase Switchfuse Complete with 3x100A & 3x125A Fuses : TP+N Switchfuses : TP+N Switchgear : Switchgear : C & K Supplies

 

[mark1979]

this is what i was suggesting
100A Fused Switch Complete with Fuse : TP+N Switchfuses : TP+N Switchgear : Switchgear : C & K Supplies