heater hell??

Well I think that your above example IS the non supported config, the wild leg is like 208v to ground and so would be above the 150v to ground limit, but if you use the other common low voltage 3 phase service ( 208v wye) all the lines are less than 150v to ground and would be fine.
no such luck they don't make them. I guess I could run a 480v radiant heating bulb, but I think I will just switch the transformer on and off with a thermostat and then I can plug in a cheep 120volt heater if it will not keep it warm enough ( I think that the transformer will keep it close as I only need to keep it say 35-40 degrees in there and I have it insulated. )
Nope I didn't need any 277v so I didn't put an another wire in the trench...
William....
Reply to
William
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wouldn't you have 277v on the thermostats (running ) and still have to switch the 480 to open the contacts??
William....
Reply to
William
Ok! I must admit that in the uk we have 415v between phases and 240 to earth so I went a bit crazy, 270v aint far off though, the heaters would just last a bit shorter and heat a bit hotter!
You would have to have a contactor though with one stat as they all need to turn on at the same time other wise it gets a bit out of phase!
It seems funny that you have 480v between phases and 277 to earth but want to supply a 240v heater!
am I getting the right picture or can someone de americanise it for me? :-) miniman
Reply to
miniman
240 v is commonly 2 phases 277 v is one phase and a neutral
A 240 volt heater needs 2 phases to work correctly. You state that you have 480 3 phase so you may not even have a neutral which would mean that you would be using the ground as a neutral...... BAD idea.
What you need is a 480 single phase (2 hots) or a 480 volt 3 phase heater. Your idea will have unsatisfactory results. If I understand correctly.
Reply to
SQLit

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