3-Phase Question

[Skubie]

I've got a power inptu spec a a piece of gear that states 208V (OK so far) and "3-phase and 3-line". And they are looking for 160A. That seems aweful high for 208V. I've got 480V/400A, so that's no problem. I'm just put of as to how to transform it to the input requirements. Are they expecting my to go delta-wye and then make 3ph 208V out of that? Just seems odd.

Thanks for any insight. Sku

 

[GoldDigger]

I've got a power input spec a a piece of gear that states 208V (OK so far) and "3-phase and 3-line".

3 and 3 sounds like delta rather than wye, can you confirm this? Will there be a neutral terminal on the gear or just an equipment ground?

 

[jim dungar]

The equipment only needs the (3) hot lines, it does not need the 4th wire (neutral).

Use a standard 480-208Y/120 (delta-wye) transformer.

 

[charlie b]

160 amps times 208 volts times the square root of three gives you about 57 KVA. That is not a large number for a 208 volt system. I would use a 75 KVA transformer.