Jon651 wrote:The common term is "leg", each leg being fed by it's own "hot bus bar" -
It's easy to be confused.
I'm going to correct myself... the common term "leg" is also "line" as most homes should have 2 lines and a neutral from the power company.
I'm going to adjust the idea of a "leg" however as it applies to the breaker box: In your breaker box, L1 goes to one side, and L2 to the other... SORT OF. Each "leg" supplies one PAIR of breakers across from each other.
So it is NOT a case of using just the left breakers, or the right. That is completely incorrect.
The term "leg" refers incorrectly to the "side" of the breaker box. But in reality, the L1 and L2 bus (in your main panel) run down the middle, in between the breakers. And they alternately supply *every other* row.
Since odd#'s are on the left, and even's on the right, that means that breakers 1 and 2 are on the same PHASE/LEG/LINE. the next couple of breakers down, 3 and 4, are on a DIFFERENT phase/leg/line.
This pattern repeats, alternating phases every row of circuit breakers. (if you have a double-breaker, it is using BOTH phases/legs/lines).
From my experience, these devices CANNOT cross phases so if they are plugged into difference circuits which happen to be fed power from a row on the other phase as the first circuit... they won't ever work. Trial and error is the only way to determine the phase in this case.
Say you have your transmitter plugged into an outlet using breaker #1. An outlet may not work (you find out it is supplied by breaker 3), while one on the other side will (powered by breaker 9) because... even if a different circuit... that circuit is powered on the same phase/line/leg (i.e. breaker ). Rows for breakers 3 and 5 are adjacent and thus on different phases. Electrically, they are isolated from one another and CANNOT "communicate".
For my example, breakers 1+2, 5+6, 9+10, 13+14, 17+18 are on phase A, while 3+4, 7+8, 11+12, 15+16 are all on phase B. These devices will ONLY work if both are plugged into outlets using the same phase (regardless of circuit/breaker).
Well, I lied. The ONLY way to fix it and have everything in collusion is to use a "phase coupler" installed as a double breaker. This will bridge the 2 legs electrically so all your UPB and X10 and powerline devices work no matter what circuit/breaker/phase they are using. There are several model out there (leviton coupler repeater, or the simply automated phase coupler)