Thanks,
This answers my question.
The system is quite complicated in comparison with the European only 230V
three phase. Has that a historical reason?

Leo van Loon

-----Oorspronkelijk bericht-----
Van: Dennis O'Brien <deobrien@SYMPATICO.CA>
Aan: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Datum: dinsdag 21 juli 1998 14:58
Onderwerp: Re: [OT] 240V in USA


>The 120/240 single phase power ( two lines and a neutral) basically goes
into every home. The connection is simply a centre tapped transformer.
>
>Low power appliances (TV, lights, ...) run on 120 V. Higher power loads
(stove, clothes dryer, electric furnace,...) run on the 240 V supply.
>
>For light/medium industrial the power system typically uses  120/208 or
277/480 Volt, 3 phase power. In Canada we use 120/208 or 346/600 Volt 3
phase.
>
>Hope this answers your question.
>
>
>----Original Message-----
>   >From:       Leo van Loon <sbb.simpeltron@TIP.NL>
>   >To:         PICLIST@MITVMA.MIT.EDU
>   >Subject:            [OT] 240V in USA
>   >Reply-To:           pic microcontroller discussion list
<PICLIST@MITVMA.MIT.EDU>
>   >Date:       Tuesday, July 21, 1998 05:15
>   >
>   >Dear friends,
>   >
>   >In another mailinglist a member told about a two-phase 120V net with
180
>   >degrees phase difference in parts of the US. I do not understand how
high
>   >power induction motors can be used with such an electricity supply.
Three
>   >phase rotary currant was invented for this type of motors.
>   >Can anybody from the States tell me about the finesses of this type of
>   >electricity supply?
>   >
>   >Leo van Loon
>   >SBB simpeltronics
>   >Netherlands
>   >tel +31 (0481) 450034
>   >fax+31 (0481) 450051
>   >mail sbb.simpeltron@tip.nl
>   >url http://www.sbb-simpeltronics.nl
>   >SBB simpeltronics ontwikkelt technische projecten voor basisschool en
>   >basisvorming.
>   >SBB simpeltronics develops technical projects for children in primary
and
>   >secondary education.
>   >
>
>