Is that with current flowing to something plugged into that
Or is it with that circuit breaker off???
Because with even a cheap meter there can be small induced voltages
from other wires that are working, running parallel in the same area
etc. on even a so called dead or disconnected wire.
Also maybe on one side of a working Edison circuit!
Description of the situation; where and under what conditions the
voltage was measured etc. would help.
Five volt drop on a working circuit with something actually plugged in
and working (current flowing) does sound a little unusual, and might
suggest a high resistance connection somewhere to be investigated for
a faulty item..
However a 5 volt drop on a working circuit drawing say 10 amps
suggests a resistance of around 5/10 = 0.5 ohms which for 12 AWG is
approx 300 feet of single conductor copper. Is the conductor under
size or does the circuit go through a lot of duplex outlets etc.
before the point of measurement? Older backstab outlets are often
mentioned here. Not aluminum wiring perhaps? Hard to comment.
Help me here....I followed the link and was in the process of reading
it (and, of course, looking at the figures)
Is the figure properly annotated? the "hot-neutral reversed" figure
has two leads labeled as H.....
am I mis-reading it or what?
On Thu, 22 Oct 2009 08:02:45 -0400, John Grabowski wrote:
They are all tight.
As far as under 5v, the needle moves on some outlets when measuring neutral
to ground. I know that either ground or neutral will pick up stray
induction voltage when running along metal beams.
The neutral and ground are tied together at the service entrance, and
should not be tied together anywhere else. So if you measure the
neutral to ground voltage at some point distant from the service
entrance, and there is any current on the neutral conductor anywhere
between your measurement point and the service entrance, you will see
a voltage difference. This is due to the voltage drop from the
resistance of the neutral wire carrying that current.
If your grounding system has no connection to the neutral anywhere,
then it is not very useful. The grounding system should have exactly
one connection to the neutral, at the service entrance. The primary
point of the grounding system is to complete a short circuit should a
live wire accidentally contact the grounding system, thereby opening
the breaker for the circuit. For that to happen, you need to have the
ground bonded to the neutral at the service entrance.
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