[Shop-talk] Yet Another Wiring Question

[Vin Marshall]

A 2 phase circuit would look like what I have here in my shop (an old  
building in Philadelphia): two separate, 240 V single phase circuits  
phased 90 degrees apart.  Upon entering the shop, these two circuits  
run into a 2 phase -> 3 phase transformer.

Interesting footnote: This building is apparently supplied by the  
city with 3 phase (the city having all but terminated 2 phase service  
so far as I know to all but a small group of buildings), which is  
apparently transformed to 2 phase and run through out the building to  
the individual shops, which may then either pull off one leg for  
single phase 240 V service, or which may use both legs for conversion  
back to 3 phase (or do a little of both, as I do).

The building is reported to have a quite unfavorable power factor.

-vin




On Jun 30, 2009, at 6:26 PM, Doug Braun wrote:

> So, what DOES a real two-phase circuit look like?
>
> Doug
>
> --- On Tue, 6/30/09,
> David Scheidt <dmscheidt at gmail.com> wrote:
>
>>
>> My AC circuits prof would box
> your ears for that.
>> There's one phase.
>> Choosing the neutral as a
> measuring point doesn't magically
>> give you
>> two.  (Were there really two
> phases, you wouldn't be
>> able to run 240V
>> loads from the system.)
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