ECN Forum Forums General Topics of the Trade General Discussion Area Residential 3 Phase, Why / Why Not?

I agree that motor efficiency must be taken into account for 3 phase versus single phase.

Here is a quote from Reliance's web site on motor efficiency:

THREE PHASE POWER & SINGLE PHASE POWER
3 phase power is typically 150% more efficient than single phase in the same power range. In a single phase unit the power falls to zero three times during each cycle, in 3 phase it never drops to zero. The power delivered to the load is the same at any instant.


[This message has been edited by sandpiper (edited 01-22-2006).]