And then you run into the electrician that looks at black and thinks
"LOAD"... and white "NEUTRAL"... ARGGGHHH!!!
On 04/10/2019 02:12 PM, [email protected] wrote:
This I like.
*From:* Carl Peterson
*Sent:* Wednesday, April 10, 2019 2:57 PM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] DC/DC converter question
My rule for -48 plants is we label the - side -48 and the + side RET.
Then I get a hammer and beat "positive is positive and negative is
negative" into my techs heads. I also like to do Black for RET and
white for -48.
On Wed, Apr 10, 2019 at 3:49 PM Adam Moffett <[email protected]> wrote:
There's an IEC standard where you use +blue and -gray for a -V DC
system.
I'm sure we can find a document somewhere saying -Red for a -V DC
system.
I read a book when I was around 10 or 11 that said red was positive,
and
that stuck with me forever.
Then I learned about AC where red was a second hot when you need 2
phases or a 3-way circuit.
When you get multiple DC circuits in one box it seems more dangerous to
follow "standard" colors than not to.
So I'm not gonna bag on anybody for preferring one way or another as
long as they're self consistent. Some future generation might thank
you
for putting a label somewhere that says "+" or "-".
When you get into someone else's box, Red is just a color, and you
better get your multimeter out and check. Assume makes an ass out of u
and me. Mostly me. It also blows up your equipment and trips
breakers. I guess if someone labeled a wire as "+" I'd be more likely
to believe it, but you never know who came after and thought it was
wrong and decided to "fix" it.
I'm not trying to lecture the EE about electricity. Just shouting at
the wind I guess.
On 4/10/2019 4:16 PM, Ken Hohhof wrote:
> I have a couple sites where I used purple or blue for -48, but I
have spools
> of red/black zipcord that I use a lot, and I assign red to voltage
> independent of polarity, so that black is ground. Then even if I
use single
> wires, I make red voltage and black return in order to be consistent.
>
> I think it would be even more confusing to have red be ground and
black
> be-48V. Especially at mixed voltage sites that also have +24V.
>
>
> -----Original Message-----
> From: AF <[email protected]> On Behalf Of Adam Moffett
> Sent: Wednesday, April 10, 2019 3:08 PM
> To: [email protected]
> Subject: Re: [AFMUG] DC/DC converter question
>
> Some people use red for negative on -48V systems.
> I've got a -48V Alvarion Wimax thingamabob with a red and black
pigtail
> coming out the back and the red is clearly labeled negative.
>
> So yeah, can't go by color unless you put that color there.
>
>
> On 4/8/2019 3:31 PM, Christopher Tyler wrote:
>> Turns out the whole shelter's bus was wired backwards when we
got it. Red
> is negative and black is positive. Not sure what the ground is
relative to,
> not sure it really matters at this point but I'll check that out
when I go
> out there later myself.
>
> --
> AF mailing list
> [email protected]
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
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