wrote in message
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On Aug 16, 6:31 am, "RBM" wrote:
wrote in message

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About 10 years ago I bought a Square D 100 amp electrical panel and
some breakers at Home Depot and had an electrician replace my old
box. I suspect that one bus is not energized because last night, a
number of lights and outlets throughout the house stopped working.
After I flip the main breaker, remove the cover, and verify that both
incoming hot wires are tight, what else can I check for?

Check to see that you have 240 volts between the two hot wire before the
main breaker. If you don't, the problem may be a loose connection outside,
in the meter box, or with the utility company. If you do, check to see
that
you have 240 volts on the load side of the main breaker. If you don't, you
have a bad main breaker

Thank you very much! One leg feeding the meter is down so it's
Entergy's problem.

What causes this? Is there something wrong with the neighborhood
transformer?

More likely a bad connection on that leg. It can occur anywhere between your
meter socket and the transformer itself, usually at some junction or splice