Roy Matson
Member
QUOTE=brucechase;303834]It's not dangerous. I have seen and worked on many.
Well for one thing it's 480 to ground instead of 270. This must put more stress on the insulation of a motor designed for a balanced 480 V system.
I come from a region where we had 230/400 then jumped to 3.3 kV with very few transformers. It was a bit of a shock coming to NA where we have 120,208,240,480,575,600 and several more that escape me for the moment. I deal a lot with vendor packages, with all the Voltage choices it's very easy to end up with a motor that's not compatible with the supply.
What is the rational behind grounding one phase?
Regards
Roy
Well for one thing it's 480 to ground instead of 270. This must put more stress on the insulation of a motor designed for a balanced 480 V system.
I come from a region where we had 230/400 then jumped to 3.3 kV with very few transformers. It was a bit of a shock coming to NA where we have 120,208,240,480,575,600 and several more that escape me for the moment. I deal a lot with vendor packages, with all the Voltage choices it's very easy to end up with a motor that's not compatible with the supply.
What is the rational behind grounding one phase?
Regards
Roy