Hello all, Recently one of the power meters on one of our office's panelboards has been giving sensor garbage, calling the others' measurements into question. I have two 277/480Y transformers, one going to a two phase 480V duct heater and one going to the lighting (the meter reads three phase). The duct heater reads as follows: Load:.1KW A 277.8V 0A 0%PF B 280.2V .6A -23.9%PF C 281.8V .5A 72.2%PF And the lighting: Load: .4KW A 280V 0A 0%PF B 278V 1.5A 99.9%PF C 0V 0A 0%PF There definitely seems to be at least one thing wrong: Why am I getting a negative PF for a duct heater? Apart from that, I'm unsure why I'm reading 0V on phase C for a supposed 3 phase unit. It isn't mislabeled; the meter is telling me three phase on the display. I'm not sure why lights would need 3PH power in the first place. I would like to be sure that something is wrong before I call for repairs again. Anything seem off?