Question about 3-phase

[fast one]

My utility only offers 4 wire services for new construction. 3 wire services are maintenance only, if you have them, they will maintain them and you can keep them forever.

If you have a delta bank hanging outside you may be able to reconnect, they may require you to put 4 wire in.

 

[wyliesdiesels]

My utility only offers 4 wire services for new construction. 3 wire services are maintenance only, if you have them, they will maintain them and you can keep them forever.

If you have a delta bank hanging outside you may be able to reconnect, they may require you to put 4 wire in.

120v/240v Delta IS 4-wire...

 

[sberry]

Do you really want this headache so you can power a used mill?

 

[slodat]

its still a coil of wire that makes a circuit... ALL transformers have a no load loss figure, even though the there is no current flowing in the secondary, the transformer still hums right? there is still some current flowing to excite the windings. i doubt that the no load loss is 9% of the nameplate, but i wouldnt doubt that the full load losses (lost as heat) would be 9%...

It's called magnetizing current. It is determined from the impedance of the primary.

I have a 400a 3 phase 4 wire 240v delta at my old shop. Basic meter charge a bit more than my home service. Cost per kWh is a tiny bit less than domestic service. Will be installing similar service at the new shop. Going to cost me about $1000 to the utility plus meter base and 3 phase panel.