[Boatanchors] Basic electricity question

[Chuck McGregor]

John-

Two-phase is an archaic 4-wire power system which may still be in use in 
some heavy industrial facilities in the northeastern US. The two phases are 
90 degrees phase shifted from each other.  I doubt that any new two-phase 
systems have been installed during our lifetimes.

The common US domestic wiring system is correctly called a 120/240v Single 
Phase system.

73,
Chuck N7RHU


At 03:59 PM 1/13/2005, J. Forster wrote:

>Simply put, the ground is a protective conductor. Akin to the case of a 
>breaker
>box. It's typically connected to physical ground or a water pipe, depending on
>code.
>
>In two phase circuits (as used in domestic situations) the line is like 
>the plus
>and is hot to ground.
>
>The neutral is the return like the minus and is usually near ground. 
>Neutral and
>Ground are connected at some point.
>
>If the line voltage is observed with respect to neutral on a scope, it 
>will be a
>sine wave. If you have a multi-trace scope, and put the other channels on the
>other lines in a three phase circuit, you will see three sine waves, 120 
>degrees
>shifted in phase between them.
>
>That's roughly it.
>-John
>
>William L Howard wrote:
>
> > BA's and 3-wire cords
> >
> > For those of us who are not electricians, would somebody please explain
> > two phase versus three phase current and also what is meant by neutral
> > lead, and ground? If it were DC it would be positive + and negative -
> > but with AC it alternates.
> >
> > Simple explanations appreciated.
> >
> > Thanks,
> >
> > Bill Howard
> >
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