like, what's your phase? [RE-wrenches]

[Drake Chamberlin]

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Hi Marco,

A 120/240 volt single phase system is derived from a center tapped single 
phase transformer (or generator).  By grounding the center point of a 
standard 240 volt transformer, we get our two 120 volt legs.  We also get 
the benefit of having 240 volts available with only 120 volts to ground.

European systems often have a single phase 240 volt system grounded at one 
end.  That way, one can get a 240 volt shock from a wire touching the case 
of an ungrounded appliance.

-Drake



At 09:21 AM 5/11/2005 -1000, you wrote:
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>A basic Electricity 101 question: why is "single phase" three-wire (two hots
>and a neutral) 120/240VAC called single phase?  Aren't there actually two
>phases 180 degrees opposite of each other?  I mean, I can clearly understand
>why three-phase power is called three phase with each phase, at least in the
>U.S., 120 degrees out-of-phase with each other with no congruence of the
>phases at the zero crossing.  Why then isn't "single phase" actually called
>two phase?  (And yes, I know that "single phase" is also referred to as
>"split phase."  The word "split" implies two, right?
>
>And if, in fact, "single phase" power is single phase, then what's two phase
>power?  I read in the American Electricians' Handbook over the weekend
>references to "two phase power."
>
>I'm confused...
>
>Marco Mangelsdorf
>President
>ProVision Technologies, Inc.
>69 Railroad Avenue, Suite A-7
>Hilo, Hawaii 96720 USA
>(808) 969-3281, fax 934-7462
>www.provisiontechnologies.com
>
>
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