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can anyone explain the operation of triple pole mcb's to me. for a 32A tp does that mean 32A in each phase before the breaker trips or is it 32A total?

cheers for the input guys. can i have some opinions of what people would do in this situation? i know the circuits already working to its max and theres more than enough equipment on there alraedy, it seems a no brainer to me but the boss is a '' it'l bi reyt merchant '' n she's putting the...

off the body of the fuse yeah, 800A bs88's!

ha ha crafty! think if they put the new machine in ill book the day off when there givin it the trial run. believe it or not they had a pir done last year but he must have been a bit of a clown because none of this was mentioned in the report! he has the main fuses down as 400A but they...

thanks for the input guys, much appreciated. ill try and make the picture clearer. the mains tails are i believe 185mm. these go to a 800A main isolator that has 3x800A fuses in for each phase. from there it splits off to power the high level bussbar wired in the 120mm 4 core swa( this...

hi discovered a problem at the company where i work and would like some advice on possible solutions please so i know what im looking at before i go and tell the boss! what we have is a 3 phase supply that goes through a fused isolator (3x800amp bs88 fuses). after this it splits via a bb...

so a 3 phase appliance taking 150 amps could be wired using swa 4 core 16mm? thats 50 amps per phase and you could protect each phase with a 63 amp bs88?

ok cheers for that.

would appreciate if somebody would clarify this for me please. use this as an example;- page 226 regs, where it says 16mm cable rated at 77 amps for ''1 three or four core cable, 3 phase a.c'' is this 77 amps for the whole cable or 77 amps per phase, i.e 241 amps total that the cable can...

hey, thanks again. forgot to ask, what about say a motor or a machine in a workshop. do they pull equal amps down each phase as they are working? thanks again, should get that pass grade now!

thanks, all much appreciated!

sorry, meant to ask for an individual peice of equipment, say a motor or a machine? are the mps balanced out for this instance?

its a question ive got in my college assignment, bit lazy i know but suppose thats wot the forums for!!! one last question, if the phases are out of balance is that a problem or not? cheers.

what about diversity for 3 phase? is it worked out using same principles as on site guide for single phase. does the equipment drag equal amounts of amps down each phase roughly then? many thanks.

wondered if anybody could answer my query. was wondering how 3 phase works? if ive got a 3 phase + neutral supply at the mains intake and there's a 400 amp fuse in each phase does that mean it can take 400 amp down each phase before it blows the fuse or is it 400 amp total? cheers.