LD1
Epic Contributor
I'm going to add something here that always bugs me. People refer to their electrical service as being 110V or 220V (or even worse as a 120V/220V service...it CANNOT be 120V/220V) but it isn't, it's 120V/240V, and here's the reason why.
Your basic voltage control at substations, regulators etc is always based on 120 volts. You might have a substation with a 72,000V or 138,000V line feeding it and the transformer might be putting out 25,000V but when we adjust the transformer for output voltage, it's ALWAYS done based on 120V. At the substation transformer, that might be set at 123 or 124 volts to offset voltage drop through the power lines but down the line residential voltage should ideally be 120V to neutral/ground and 240V phase to phase (single phase power).
Yep, it does get very confusing indeed for the average person.
Currently, I hear 3 main ones: 110/220 115/230 and 120/240
110/220 was old terminology.
115/230 is typically what appliances and stuff are rated to. +/-10%
120/240 is what the power companies actually deliver +/-5%
So your appliances @ 115+/-10% should be good from about 104v up to about 125v. This should cover you on the power companies +/-5% as well as voltage drops within the houses branch circuits themselves:thumbsup:
But to refer to it as 120/240 is the most correct way.