Unit one 3hp walk in, burnt contractor coil,Unit two 5HP produce case line up,off on oil pressure.Unit 3 Carrier 48TM009 RTU,burnt trans and IGC board.Voltage readings 197,190,182 One of the phases to ground 80v,only slightly better in the basement.So we call sparkey,I go for coffee.When I come back much of the lights in the store are going on and off Con Edison gets called,I shut down all my three phase stuff.They pull the man hole cover in the street,one phase wire burnt to a crisp ,another smoking.I got to say these guys did some job,they did a resplice live in less than two hours! Readings now 217,215,212!
You did a really smart thing by getting your equipment off-line ASAP. Saved somebody a bunch of money. Seen several 3-phase motors cooked when a phase goes low or goes away. People should put phase monitors on such things - they rarely do.