I would like to see the numbers on this. How can it be cheaper to run 3-phase HVAC equipment off single phase using a phase converter instead of using 1-phase equipment? Phase converters are not 100% efficient.
I think your customer/friend saw the circuit sizes for 3-phase and single phase equipment and figured the 3-phase equipment must be cheaper to run since the circuit size is smaller.
Curt
[This message has been edited by caselec (edited 04-21-2004).]
