I would be more than happy with that scheme.
Look up at a fuse or CB panel, see red and blue and you immediately know
what you are working with.
-----Original Message-----
From: dmmoff...@gmail.com
Sent: Monday, January 8, 2024 10:39 AM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] -48V kicking the dead horse
I concur with the wire color problem.
* My current employer pays big bucks to a low voltage guy who wires up our
sites. His work is absolutely beautiful. It's like friggin artwork.
He uses black for return (+) and green for ground. Then since most of our
equipment has dual power supplies he uses red and blue for the "A" hot and
"B" hot. I assume his employer trained him that way for a reason and that's
probably common.
* I was taught in childhood that red is positive, so that's what I have
always done. I'm not philosophically opposed to the idea that red is "hot",
but that's just now how I learned it.
* https://ztlabels.com/blogs/news/dc-power-circuit-wiring-color-codes
This site advises that for 2-wire DC with positive ground is white for
positive and black for negative. Someone apparently thinks that's the right
way. The same site points out that the only color called out specifically
in the NEC is green or green/yellow for ground. Everything else is just the
convention people landed on.
Out in the wild you might see anything so there is and will always be a
multi-meter in my everyday toolkit.
-Adam
-----Original Message-----
From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof
Sent: Monday, January 08, 2024 12:01 PM
To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com>
Subject: Re: [AFMUG] -48V kicking the dead horse
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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