240v from 3 phase?

Question

I have a 240v fuse box wired red( live ) from one of the phases
I need more power, can i get another fuse box put up and run the live to another phase,,,, is this true.......MQ.

Sorry, sorry, let me start again, iv got a factory in UK the supply is 3 phase the 240v is taken from 1 phase to a fuse box
to supply the wall socket's. The 9 fuses
are all taken.......the electrical guy said he would do my org/question is this right
or is he pulling the wool over my eyes MQ.

Answer 1

Yes, you can get another fuse box, which I would recommend anyway, but is the device you want to power rated for 240? You also need to measure between earth ground and the RED phase to determine whether or not you have your supply from a "delta" or "wye" transformer.

If you measure between earth ground and your RED phase and have a voltage like 180 VAC, you are most likely on a "wye" circuit. If that's the case, you should have a WHITE neutral wire in your box.

AND I CAN'T SAY THE NEXT PART EMPHATICALLY ENOUGH: MEASURE YOUR WHITE WIRE VOLTAGE TO EARTH GROUND BECAUSE IF YOU HAVE MORE THAN ONE VOLT AC, YOU HAVE A FLOATING NEUTRAL WIRE, AND THE ONLY THING KEEPING IT CLOSE TO ONE VOLT IS A BALANCED "WYE" LOAD (which many electricians consider when wiring from distribution transformers).

Let ANSWERS know what you really want to do because your solution may require additional hardware.

REMEMBER: The last thing you want is an electrical fire - if you have a fire and your insurance company discovers that an indentured journey-person electrician did not do the work, YOU ARE OUT TO DRY!

OTBPOC

Answer 2

So, all the circuits coming from your 240V fuse box are, obviously single phase, and your fuse box supply, incomer, is 240v single phase.

The best way is to purchase a bigger fuse box with a bigger bus bar thus higher rating. For example, in domestic fuse boxes you can usually get 65 amp or 100 amp units.

Obviously, if you choose this route make sure your single phase supply can supply the load. For example, if you put in a 100amp box, the incomer cable should me 25mm2 and fused at 100A.

Installing another fuse box supplied from another phase - say the blue or yellow phase - which is serving the same area is dangerous.

If you have 3 floors in a building, you can supply single phase to each floor from the 3 separate phases, BUT mixing the single phase supplies on one floor or area is iffy.

If there is ANY electrical connection between the differant phase supplies, you will form a 415V circuit and blow the hell out the lot.

To clarify, if you had your TV on the red phase, and your DVD on the yellow phase - you have formed a phase to phase supply - BANG.

I would get a qualified electrician in. Do you know it is now ILLEGAL to do this level of work in the UK now unless you are qualified and registered.

Answer 3

3 Phase Fuse Box

Answer 4

I suspect what you are saying is that you have a three phase supply, which is around 415 Volts, phase to phase measurement. From what else you say you have a 240 Volt single phase supply which you are using for your load distribution. This would be phase to neutral point which gives 240 Volts. I would therefore recommend, that if you have a three phase supply, you fit a three phase distribution cubicle which will allow a more even spread of load, and a greater loading option, if spread across all three phases. So.....................use a three phase distribution board as opposed to three single phase distribution board. Its more practical and safer

Answer 5

micky_quick999 checked out his profile & there it was blank

so now we have to play Psycic... where in the world does he live....not the USof A.. cos they have 110V supply

Could be Australia???

In Australia..
power between phases is 415V.. power from phase to earth or neutral is 240V. So if you have another phase wired in then you will have 240V at the socket...

these phases could supply you VOLTAGE..

By power if you mean AMPERAGE then another phase will double the amps you can draw...

Or you could just get the electrician to fit more CCT breakers/ fuses in the existing power board as long as its not overloaded this will also give you 240V with some more amps.

hard to explain simply .. If your not an electrician then you need to get one..

Answer 6

It depends on what the load is.
You may just be able to improve the wiring to get more current on one phase. Having more than 1 phase at home is very dangerous.

Answer 7

what do you mean more power... its 110-240 or 440 three phase, thems your only options off a mains supply.

if however you just need more outlets, then of course you can put another junction box in... (or fuseboard/distribution panel)

dont know about crossing phases though, so yould better ask an electrician... what black and hangs from the ceiling? an amature electrician....

power bites..be careful

Answer 8

If you use a second phase, as well as ensuring that the two phases are kept separate you will also have to contact your electricity supplier to change the metering equipment in your premises.

Answer 9

I have never heard of a three supply in a home so I dont think it's possible to do as you say.Be careful,look at your other answers.

Answer 10

I think your best (and certainly safest) bet is to hire a qualified electrician to do your wiring.

Doug