3 phase 63A

[dave-gardiner]

Hi
we have a 3 phase 63A isolator.
i have been asked to supply from this 3 x single phase 63A sockets. I have said this cannot be done because the neutral is only sized for the 63A supply. But now i am questioning myself. Help please

 

[dave-gardiner]

Now we are talking

 

[MDJ]

Can't resist any longer!

3 single phase 15kW heaters wired with 3P plugs on Brown, plugged into these three sockets..............

But the OP said three single phase supplies from 1 3 phase supply, he didn't say one phase for all three supplies you silly Northerner lol

 

[Guest 004]

well at least you will be warm for a bit

 

[ipf]

Can't resist any longer!

3 single phase 15kW heaters wired with 3P plugs on Brown, plugged into these three sockets..............

I'd use red plugs, anyway.....easily hold the heaters with 1''1/2x 8's

 

[Silly Sausage]

But the OP said three single phase supplies from 1 3 phase supply, he didn't say one phase for all three supplies you silly Northerner lol

Damn you smart arse southerner, BUT if it was wired in a weird way....

I'm going to become a plumber.

 

[MDJ]

But that would then be exceeding the capacity of the equipment and a better design required, and it is hypothetical as it is not what the OP mentioned haha

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I'm going to become a plumber.

No don't do it, we have lost too many good men to that trade already LOL

 

[telectrix]

OK. assume all 3 phases pull the same. neutral current =0.

take a possible scenario. L1 =63A, L2 = 10A, L3 =10A, N current will be around 53A. and you'll get similar results for any combinations. N current will never exceed 63A.

 

[Guest 004]

The end result is the neutral conductor should be designed to carry the most onerous current that could flow in it. Hence, under a pure resistive load condition, the neutral conductor needs to be the same size as the line conductor.

 

[Plonker 3]

It will be, the OP has never said other wise.

 

[ipf]

Three cheers for T.......hip,hip

 

[MDJ]

The end result is the neutral conductor should be designed to carry the most onerous current that could flow in it. Hence, under a pure resistive load condition, the neutral conductor needs to be the same size as the line conductor.

Well yes, but not 3 times larger which is where the thread seemed to be going at one time, to answer the OP=no problem providing the load for each phase does not exceed the protective device for that phase.

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Yes hooray for Tel, but me and Diilb did try to tell everyone LOL

 

[Silly Sausage]

Gentlemen...Let me present for your delectation..........




Harmonics!

 

[Guest55]

this thread =





.............

 

[snowhead]

Can't resist any longer!

3 single phase 15kW heaters wired with 3P plugs on Brown, plugged into these three sockets..............

The 3 sockets will be 1 on each phase / line.

 

[MDJ]

HAHAHA, Biffs here and already I feel the thread has improved.