Re: power supply connection issues

--- In CAD_CAM_EDM_DRO@y..., Larry Shull <larryshu@p...> wrote:
> Jim,
> You can hook the green wire to a water pipe also, anything
that is well
> grounded. It is called a case ground for a good reason, it grounds
the case
> of the equipment. If there is a short to the case of the equipment
it takes
> it to ground instead of to you the first time that you touch it.
People used
> to get killed that way, that is why there is a 3 wire system now
instead of
> the old 2 wire system.
> The reason that the white wire is called a neutral instead of a
ground is
> because that is what it is. It may not necessarily be at ground
potential.
> It is the ground reference for the transformer but it may not be a
ground.
> If you have a clamp on amp meter put it on the neutral wire coming
from your
> house to the transformer on the pole. You will probably get a
reading on the
> neutral wire. It carries the diffrence between the 2 hot legs to
your house.
> If you have 15 amps on one hot leg and 10 amps on the other hot
leg then you
> will have 5 amps on the neutral. If you are between that neutral
and a
> better ground than the transformer has that 5 amps will pass
through you to
> ground. I personally do not want 5 amps of current passing through
me, it is
> certainly more than enough to cause a 60 cycle heart failure.
> You pays your money and you takes your chances as they say, to
you it
> may not be worth the effort of running a ground wire, to me it
would be a no
> brainer. I've been doing Power Co work for over 40 years, I expect
to retire
> next year with no burn marks on me after working with everything
from 110
> volts to 34500 volts on a daily basis.
> Larry Shull
>
>
>
> ----- Original Message -----
> From: "jagco1998" <jagco1998@y...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Wednesday, October 16, 2002 7:01 PM
> Subject: [CAD_CAM_EDM_DRO] Re: power supply connection issues
>
>
> > I live in an old house. And the last time I changed a burnt
outlet,
> > it was not grounded(only had 2 wires...black and white)
> > So if I want to use this supply I need to drive me a grounding
rod
> > and run the "G" terminal off of that and hook up the other two
Wht
> > to Wht.........Blk to Blk. Right?
> > Is the grounded green wire to grounding rod really necessary?
> > Will not using this "G" terminal hinder the performance of the
PS or
> > cause it to malfunction?(ie. just using L and N to power the
supply)
> > I realize that I probably sound like an idiot , but I payed good
> > money for this used Power supply, and I do not want to burn it up
> > before I even get to use it throwing some chips!
> >
> > Regards,
> > Jim
> >
> > --- In CAD_CAM_EDM_DRO@y..., Larry Shull <larryshu@p...> wrote:
> > > That is an easy one! Even I am smart enough to answer that one.
> > (I'm really
> > > feeling stupid right now because I know nothing at all about
CNC,
> > but am
> > > starting to get the idea, thanks to this group.)
> > > I work for the power Co.
> > > The N is for your neutral connection, it will be the white
wire.
> > > The L is for line voltage, it will be your black wire.
> > > The G is as you guessed, the case ground wire.
> > > The neutral and the ground wires are not interchangeable.
The
> > green case
> > > ground should go to a good hard ground, such as a driven ground
> > rod. The
> > > neutral should be connected to your neutral connection in your
> > breaker box,
> > > which is a return line to the transformer. Without it you may
get
> > some
> > > strange voltages.
> > > Hope that helps you out.
> > > Larry Shull
> > > ----- Original Message -----
> > > From: "jagco1998" <jagco1998@y...>
> > > To: <CAD_CAM_EDM_DRO@y...>
> > > Sent: Wednesday, October 16, 2002 5:13 PM
> > > Subject: [CAD_CAM_EDM_DRO] power supply connection issues
> > >
> > >
> > > > I bought a used power supply that has no cord attached.
> > > > I went to the manufacturers website and the only info they
had
> > on it
> > > > was the same markings that are on the board of the power
supply.
> > > > I was hoping that one (or more) of you intelligent people
could
> > help
> > > > me with this.
> > > > The marking for the input AC are N,L,G. All of which are
> > together
> > > > in one terminal block.
> > > > I assume that the "G" is ground,(could be wrong), but what
are
> > the
> > > > other two?
> > > >
> > > > Regards,
> > > > Jim
> > > >
> > > >
> > > > Addresses:
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> > > >
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> > Addresses:
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> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach it if
> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
as a
> sister site to the CCED group, as many of the same members are
there, for OT
> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> >
> > Post messages: CAD_CAM_EDM_DRO@y...
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