Residential Voltages are specced to be:
a.. Voltage, including tolerance (usually +10 or -15 percentage)
and 120/240 Vac nominals. These are the voltages that must arrive at your
residential meter. Many places online give this spec; just look for them.

HTH,

Twayne`


In ,
Art Todesco typed:
I have been having a problem with my computer speakers. They, for no
apparent reason, start buzzing very loudly. I've determined that, if the
speakers are powered with a
slightly high power line voltage, they will indeed buzz. I
tested this by plugging the wall wart into a Variac and
monitoring the voltage with a DMM, not true RMS, actually a
Fluke 8020A.. At about 126 volts, the buzzing starts. Today I came into
the house and noticed beeping from my
computer's UPS. It was definitely in the "power out of
range, use the batteries" mode. The inverter was humming
and there was some heat coming from the heat vents on the
UPS. After checking around I measured the line voltage at
127 volts. I thought this was a bit high so I called the
power company. They indicated that this was NOT considered
high, but are sending out a tech anyway. So, my question
to all you experts out there, what is considered high? My
UPS thinks it's high. My speakers don't work, but, I know
they are cheapies.