I've got a request to fix a snafu made by engineering when they designed this layout. The end-user wants 3 lights that monitor the voltage status on each of their phases to ground (neutral is bonded to ground in the panel).
Since the incoming utility is 208/120Y, they just connected a 120VAC light from each phase to ground and called it a day.
However, we include transformers (labeled XRFMR) for control power in our cabinets for (somewhat) isolated control power. Most of you will see the issue right away here... Whenever they lose A or B phase, the voltage will backfeed through the primary of the transformer and keep the phase light illuminated.
I've been wracking my brain here on simple solutions, but I can't come up with anything that gives us individual lights for each phase. There are numerous phase-loss relays out there that monitor all 3 phases and give you a single NO/NC contact, but nothing with a contact per each phase.