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Date:	Sun, 9 Mar 2003 19:10:59 PST8
From:	Steve Carter <scarter@vcnet.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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The standard color scheme for 12V DC is
red = positive
and
black = negative

(But in PCs, the yellow wire is the +12V; the red wire is +5V.
Go figure.)

Negative ground systems are most common, although in a UPS there is
no requirement to ground either terminal of the battery. It may
or may not be grounded.

The standard color scheme for 120V AC is:
White = neutral (grounded at the building's service entrance)
and
black = "Hot" (hot by default since the white wire is nominally "grounded")

In multi-phase systems other colors are "hot" also, most commonly red
and brown.

There can be a difference of several volts between neutral and "ground",
due to ground shift (voltage drop) caused by current flowing in the
neutral wire.

The green wire is safety ground and does NOT carry any current,
except in the case of a an electrical fault, thus saving your bacon
and preventing your heirs from collecting on your estate right away.
It is securely bonded to the metal chassis. Keep it that way.

+++++++++++++++++++
On 3/9/03, Martin Rosenfeld wrote, in part:
>
>All:
>
>Between black and red, which wire should go to a battery's
>positive pole? I thing red should be positive.
>=====================================================

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