240V UFO lighting

[Smash]

Doing a warehouse with about 50 UFO lights replacing T5s This is an older building with a 3 phase delta high leg. The T5s didn’t seem to mind the high leg two phases were always 240V
I wasn’t taking any chances and arranged the breakers so no high leg would be used. Everything going fine then had one as you plug it in flicker a little then nothing. Checked voltage everything was fine. After a couple more I set up a bench power supply and as I was building them (twist lock plugs ) I would test them. Two would work fine then the 3rd nothing. I’ve now installed 22 fixtures and 6 would not fire. So far the ones that do work continue to work. But the random ones brand new same everything don’t work. I’m at a loss my best guess is an older possibly cheap driver likes a neutral better than a hot. Rewiring to 120V would be a time consuming pain in the ass. Anyone ever had this problem.

 

[LarryFine]

Are you sure you don't have a corner-grounded delta?

 

[ptonsparky]

Your getting 240 to the fixtures? That's all that matters if they are designed for 240.

 

[Smash]

Are you sure you don't have a corner-grounded delta?

I’m sorry for not responding back I had a death in the family and was away for a couple weeks. It’s not a corner grounded delta however as usually is the case it was human error on my team. We had an inexperienced helper assembling the fixtures turns out when putting the twist lock plugs in he was ramming the wire in too far and when it clamped down it would sometimes clamp on insulation and not conductor. I never thought that could be the problem until I assembled the next 20 fixtures and the all worked. Not entirely the kids fault but our fault in the end. Ty to all

 

[Smash]

Customer now wants to add a few scattered emergency lights in the shop with the new UFOs. These fixtures are switched with two pole switches and are all 240V. I want to add the battery back up to a few fixtures can I just run a seperate 120v source to the fixture use the dimming leads to send signal to fixture that the power is either off or on ? I’ve never had to retrofit one of these emergency batteries to an existing ufo before and the 220V presents a problem when turned off by switch. No way for the fixture to know the difference between off and power outage. Or can I switch the fixture and leave one leg hot all the time without doing harm to the fixture ? Jump that hot over to the dimming lead for signal ?

 

[LarryFine]

While all lines must be broken for disconnect purposes, it is permissible to break fewer for control purposes.

 

[ggunn]

Doing a warehouse with about 50 UFO lights replacing T5s This is an older building with a 3 phase delta high leg. The T5s didn’t seem to mind the high leg two phases were always 240V

240V to what? In a 240 delta high leg service, the voltage between any two phases is 240V. The only time the high leg is any different is where voltages to neutral are concerned; A-B, B-C, and C-A are all 240V, and A-N is 120V, B-N is 208V, and C-N is 120V.