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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