Re: [CAD_CAM_EDM_DRO] Re: power supply connection issues

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@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
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
> > >
> > >
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> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> 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........
>
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