AC Power - two circuits better than one?

Jea48 Thanks, I don't want to get into the details but it's not possible - the outlet that's most convenient is part of a circuit that extends upstairs. In any event, it's not my house so reorganizing circuits on the breaker just isn't an option. I am going to load up the 20amp circuit as much as possible & divert the remainder to the cleanest 15amp circuit.

Jea48: We do have 120/240 servicing the house. Our A/C units use 240V with 2 pole breakers. Thank you for that input, now I can figure out how to get the pair of monos and the APC power conditioner/battery back-up on the same leg.

Weather here is chilly at night in the low 60's and gets into the mid 80's during the day! It is definitely "sweater weather" once the sun gets low in the sky.

Thanks again to Salmonsc for the informative thread. I hope others can benefit from the comments above.

Jea48: As a follow-up, you are correct, I checked voltages and circuits 1 & 2 are one one leg while circuits 3 & 4 are on the other leg. The question now is what is the best configuration for plugging in. I have three power cords (pair of monos and the APC) that must be plugged in. Right now I have the monos on circuits 3 & 4 (same leg) and the APC on circuit 1 (other leg). Is there a better way? I figure that the APC is so incredibly sensitive that having it on the opposite leg would probably be OK. Each circuit is 20 amp with only one receptacle.

salmonsc: FWIW, I took the advice of Jea48 and switched the wires on one pair of breakers in the main panel box and that action put all of my equipment on one leg of the incoming power. It took about 10 minutes. You only have to switch the hot leads, not the neutral or ground wires because they are secured to common bars within your box.

Thanks for your thread and thanks to Elizabeth and Jea48 for their useful input.

Just thought you should know that switching circuits is not all that difficult. Just be sure to turn the WHOLE BOX OFF before making any changes.

I took the advice of Jea48 and switched the wires on one pair of breakers in the main panel box and that action put all of my equipment on one leg of the incoming power.
12-17-10:Puerto

Puerto,

Not sure exactly what you did..... With a 3 wire multi conductor circuit, (2 hot conductors, 1 neutral conductor), you cannot put both hot conductors on the same leg. They have to be on opposite legs.

With a multi conductor branch circuit only the unbalanced load returns to the source on the neutral conductor.

Example: If two identical loads were connected to each hot to neutral of, say, 5 amps each zero amps would return on the neutral conductor. The two loads would be in series with one another.

Example: If the two loads were 15 amps each, again zero amps would return on the neutral conductor to the source.
But if both hots are connected to the same leg, (two 20 amp breakers), 30 amps would return on the neutral.... That's a no no......

http://openbookproject.net//electricCircuits/AC/AC_10.html#xtocid139960