When I first got started in the trade I worked for a company that did repair work for a coffee factory.
It had sensor lights on the wall in a "Y" formation and I believe it was 240 3 phase ungrounded, and if I remember my boss told me as long as the lights where dim all was OK and if one section of bulbs went bright we had a ground that had to be fixed.
Am I right so far?
I can see an advantage here for safety (no potential to ground) but what is the advantage if grounded.
Like I said I am used to 480 and if you follow code it seems like a safe and efficient way to power motors.
I hope my questions are not to basic but I would like to understand this.
