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RE: Ground current
Greetings,
As far as I know the electricity supply companies connect line neutral
to earth at their end of the consumer supply, thereafter the neutral and
earth wires
should NEVER be connected together as there is always an imbalance in
the three phases which causes the neutral at your end to be several
volts
away from ground. Anyone can measure this at home with a simple a.c.
voltmeter. Sometimes I connect a low-voltage filament bulb (torch bulb)
from neutral to earth and watch the fluctuations - occasionally the
imbalance
is so high that the bulb will blow!
So, at our end we should NEVER connect neutral and earth unless it's
after an isolating transformer.
> ----------
> From: Tesla List[SMTP:tesla-at-pupman-dot-com]
> Sent: Friday, October 02, 1998 7:56 AM
> To: tesla-at-pupman-dot-com
> Subject: Ground current
>
> Original Poster: "Paul Marshall" <klugmann-at-hotmail-dot-com>
>
> I have a question about ground current. I have 25 KVA pig, line
> neutral
> is connected to the case and the case is connected to ground. Last
> night
> I pulled out my handy meter and checked for current to ground. I found
>
> that I had a 3 amp current in the ground lead. I turned off the power
> to
> the pig and checked again, 3 amps ! I turned off the power at the
> mains
> still 3 amps. Next I checked to see what the voltage was. It wasn't
> measurable < 1 volt. Can anyone tell me what is going on ? Also there
> is
> no sign of a spark between the ground lead and the ground terminal.
>
> paul m
>
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