I literally smoked a digital COE switch due to this one time.
I have seen Blue for hot and Red for return -48
I have seen Blue for hot and Black for return -48
Black for hot and Red for return in a -48 system.
Which would make that one Red+ and Black - but positive ground.
Red for hot and Black for a return in many + and - systems.
So red is + in some systems and - in others.
I think I prefer red and black with red being positive and then you have to
have enough brains to know that it is also return and usually ground with
black being hot. Should not be a stretch due to residential 120 VAC has
black being hot.
So there, all confusion has now been erased... right...
-----Original Message-----
From: Ken Hohhof
Sent: Monday, January 8, 2024 10:00 AM
To: 'AnimalFarm Microwave Users Group'
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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