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Date:	Sun, 9 Mar 2003 20:39:27 PST8
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Re: Help with UPS...?

Content Type: text/plain

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Steve Carter wrote:
>

Hi Steve, good to have an expert in on this.

> The standard color scheme for 120V AC is:
> White = neutral
> and
> black = "Hot"

Yes, standard as per electrical code. White is the "good guy" (you can
touch it all day and it won't mess up your hair) and black is the "bad
guy" (the shorter of the two slots where you plug something into the
wall).

> The standard color scheme for 12V DC is
> red = positive
> and
> black = negative

Is this a true standard or did you mean "typical"?

> Negative ground systems are most common

I'm not much of a car mechanic, but didn't they used to ground (to the
chassis) the positive side of some cars' electrical systems? I seem to
remember (from 40 years ago) being told never to jumpstart two cars
while their bumpers were touching because some cars grounded one side
and some grounded the other side and you were likely to make more than
just the starters jump. I know this has no bearing on UPS systems but
I'm curious.

- Peter

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