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 > > > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Carl Peterson *PORT NETWORKS* 401 E Pratt St, Ste 2553 Baltimore, MD 21202 (410) 637-3707
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