"H" wrote in message
news:NPkei.6613$%t6.3623@trnddc02...
In my breaker box, I have two 40A breakers side by side. One is for the
A/C, one is for the electric dryer.

Seemingly simultaneously, both of them experienced a loss of power (around
11V) on one leg. Thus, neither the dryer nor a/c work.

What do you mean "on one leg"? I'm assuming that the power to both the A/C
and dryer is 220V.