Exit sign plug dilemma
I am am artist and recently acquired a brand new illuminating exit sign I would like to use in my next project. It would normally be hardwired & it also has a battery backup for emergencies that has its own charger. For my project however, hardwiring is not really an option and I would like to wire it to a plug in order to be able to turn it on & off. I've taken several hardwired light fixtures and successfully wired them to a polarized plug, but they were all basic 2 or 3 wire connections. This has 4 wires, blue black, white and green. Can anyone tell me how to wire this? I would like for the batteries and charger to work as intended, so it would remain lit for a bit after unplugged if possible.
Any feedback would be welcome....thank you so much for your time!
Have a great day!