Re: Mismatched Electric Meter
martinm -
Metering is not my strong suit, but this gave me a chance to look up and see what I could find. My source is ANSI C12.1-2001, Appendix A.
Quote from martinm: If you install a 240v delta meter in a 208v wye service, what is the error between actual and apparent kWh consumption and what is the mathematical equation used to calculate the error?
Near as I can tell, there isn't one. You just aren't measuring part of the 208 Wye, so that part is unknown.
For 240 delta, the only four-jaw connection I could find won't do 120/240 delta. As jt said, any of the metering ckts that will do 120/240 delta are 7 jaws. And some of them are fine for 208 Wye.
Unless, again as jt said, you are not using the 208 neutral. In this case, it wouldn't matter, it would just look like the delta. The change in voltage from 240 to 208 is taken care of in the meter. The change in phase angles wouldn't matter either. Watt meters measure the voltage, measure the current, and do a vector multiplication.
From the data we have, I don't think you can get here from there. Maybe some of our utility metering whizzes will step in.
carl