My rule for DC plants is BLACK == Ground Referenced side.
On Mon, Jan 8, 2024 at 11:02 AM Ken Hohhof <khoh...@kwom.com> wrote:
> What I can never decide on is wire colors. Especially when using red/black
> zipcord or tray cable. People expect red to be +, but they also expect
> black to be ground (except electricians who expect black to be hot and
> white
> to be neutral and green or green/yellow to be ground). And how to
> differentiate battery wiring from load wiring. I have not found an ideal
> solution other than labels.
>
> -----Original Message-----
> From: AF <af-boun...@af.afmug.com> On Behalf Of Bill Prince
> Sent: Monday, January 8, 2024 10:45 AM
> To: af@af.afmug.com
> Subject: Re: [AFMUG] -48V kicking the dead horse
>
> Yes. -48VDC means the negative side is hot, and the positive side is ground
> (or return).
>
> You can mix +48VDC and -48VDC if you know what you're doing. It helps a
> bunch if the equipment floats logic ground. You need to check to see if
> your
> equipment isolates logic from the supply voltage.
>
> Yes. Batteries can be grounded either way. They don't care.
>
> bp
> <part15sbs{at}gmail{dot}com>
>
> On 1/8/2024 8:25 AM, Mark - Myakka Technologies wrote:
> > I know we have been though this many times and I thought I understood it.
> >
> > -48VDC is the Negative side being HOT, correct?
> >
> > It is BAD to try to mix -48VDC and 48VDC
> >
> > There is no such thing as a -48V battery. A battery is a battery,
> correct?
> >
> > How about the ICT Platinum power supplies. They show as 48VDC, can they
> be used on -48VDC equipment?
> >
> > I remember Check saying something about a way to test to see if a piece
> of
> equipment that is Neg 48VDC is truly grounded as Neg 48VDC.
> >
> >
> > --
> >
> > Thanks,
> > Mark mailto:m...@mailmt.com
> >
> > Myakka Communications
> > www.Myakka.com
> >
> >
>
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Carl Peterson
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