3 phase question

[athej]

Can you supply a machine with L1, L2 and L3, using a 3 phase supply to feed 3 seprate 230 volt cicuits. The total load is 38amp spread over the 3 phases. My concern is that they are all relying on the single nuteral core. It is 1.5mm, 4 core SWA over a distance of approx. 22 meters via a 3 pole type C MCB 16amp.

Regards

Alan J

 

[endecotp]

Can you supply a machine with L1, L2 and L3, using a 3 phase supply to feed 3 seprate 230 volt cicuits.

I think you're saying that:
- You have a 3-phase supply.
- Currently, it just feeds single-phase circuits.
- You want a add a 3-phase machine.

Is that right?

If so, you don't need to worry about the neutral.

What is the current carrying capacity of 1.5mm2 SWA?

 

[Taylortwocities]

@athej
just how much current would you expect in the neutral of a 3 phase motor?

 

[industryspark]

What do you mean by '3 seperate 230v circuits' and what type of machine? (Bit better description required).

The SWA should carry the current subject to refernce method and a few other considerations but generally, 1.5mm SWA with a 16A protection is fine.

Im just a little confused with the circuit because your talking of single phase circuits yet seem to have a triple pole mcb?

Do you mean you have a 3 phase machine?

Regards

 

[JohnD]

is this a homework question?

 

[athej]

No 3 seprate 230 volt circuits

 

[athej]

1 x 2.2 KW motor 2x3kw Elements

 

[endecotp]

No 3 seprate 230 volt circuits

What is that in reply to?

If you mean that you don't have a 3-phase supply, then this machine may not work at all. What exactly is it?

 

[endecotp]

OK, the motor won't work unless it's a real 3-phase supply.

 

[deadshort]

What is that in reply to?

If you mean that you don't have a 3-phase supply, then this machine may not work at all. What exactly is it?

Well decifered endecotp !

DS

 

[EFLImpudence]

You sure?

 

[athej]

It Is a single phase motor They have run L1 to one Element 230 volts L2 to second Element L3 to single phase motor All relying on the one neutrel in the 4 core SWA

 

[endecotp]

OK so now maybe we have all the information we need to give useful answers!

 

[athej]

Cheers

 

[endecotp]

Except I'm still not sure if the "3 circuits" mentioned in post #6 are on the same phase or not....

edit wrong post number