Is this or these rooms used to store pool chemicals, i.e the oxidizer known as clorine? Or is the pool itself vented into the room. You say some are in the pool area! Any which way, its time to start over there. Coated steel, might help, PVC is still going to have problems too. But solution seems to remove source of corrosion from wiring, or vice versa.
The owner issue is a call to OSHA, or AHJ. I'm assuming this a hotel or the like? Its a puplic safety issue...
The Job on the other hand is expendable. If he wont fix this, it's just a waste of time to stay there wearing hand-cuffs.
