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Subject: Re: Why is the home voltage so high ?
Date: Thu, 03 Oct 2002 17:16:14 +0100
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John Larkin wrote:
>On Wed, 02 Oct 2002 18:21:16 GMT, "News2020" wrote:
>>I measured the voltage at the power outlets at home and found it to be close
>>to 140 V.
>>This is way beyond the expected range (110-120) ?
>This happened to me once. The power company came out and told me that
>my Fluke was out of calibration, but they couldn't deny that the
>lights were awfully bright. Turns out there was a bad connection on
>the neutral lead out on the pole; it made one side of the line go up,
>and the other go down. (This in the USA: 120-N-120)
If you have a bad neutral this overvoltage will vary with load on the
phases (your overvoltage is someone else's undervoltage). .
We had an underground cable fault (corroded aluminium sheath used for the
neutral). The first thing I noticed was an uncharacteristic hum from a 3kW
variac on the bench.
A check with a meter showed 270 - 280v (240 nominal). First thought was to
turn off all the lights and anything sensitive/expense but that actually
makes things worse. You need to turn on a few more things doing some manual
load balancing to bring the voltage back down.
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