3-phase power question WRT theater lighting

[Snipe70e]

@Crafter_Man

Nitpick: if it’s a wye configuration, then yea… it’s very common to get single phase 120 VAC by connecting between any one of the three legs and neutral. Getting a ground-referenced single phase from delta is a bit more rare. You can get 120 VAC with a delta “high leg,” and you can get 240 VAC using a corner ground. But as mentioned, it’s much more common with a wye.

I did not want to go into the wye-delta thing. I think is was around 1970 that they stopped wiring buildings Delta. I have worked in buildings that had phase lights to detect ground faults. One building I thought it was funny. The city moved and replaced the utility transformers and the secondary of the new 480/277 transformer was wound wye. But the phase lights were left in place.

[gotpasswords]

@Tim_T-Bonham.net

Theatre lights are all single-phase, 108 or 120 volts nominal (less actually, since they are run on dimmers most of the time). About the only theatre lights that might be more are large follow spots, but they are usually at most 240V single-phase. And not likely to be used in a high school theatre.

Also, most theatre lighting is not incandescent any more.

I’ll see you LEDs and raise a xenon. Speaking of which, anyone need a 4 kVA xenon power supply?