[Prev][Next][Index][Thread]
Re: Ground current
That's interesting, because (in the US anyway) the NEC and the power
companies require that the neutral and ground be connected together. But
only at one place, the building's service entrance. Anywhere else is a
no-no. In fact they won't even turn on your service in a new building until
the neutral is properly grounded.
- Mike
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Ground current
> Date: Saturday, October 03, 1998 5:46 AM
>
> Original Poster: "Nathan Bonsal" <nbonsal-at-swcp-dot-com>
>
> Another reason not to connect Neutral and earth ground- Power companies
use
> the neutral end to send intercompany communications around. Grouunding it
> effectively kills their signals by somewhere around 10 dB and they will
come
> looking for you.
>
> -----Original Message-----
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> Date: Friday, October 02, 1998 8:12 PM
> Subject: RE: Ground current
>
>
> >Original Poster: Sulaiman Abdullah <sulaiman-at-lityan-dot-com.my>
> >
> >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
> >>
> >> ______________________________________________________
> >> Get Your Private, Free Email at http://www.hotmail-dot-com
> >>
> >>
> >
> >
> >