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

[Bill Brooks]

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Todd,

It's created from a single phase from the utility. Often it is a 12 kV
distribution feeder and the distribution transformer is a 12kV/240V
transformer. The secondary (low voltage) side of the step-down transformer
has a tap half way between the two single phase conductors that is grounded.
This effectively splits the voltage in half so that you can pull 240 Volt
loads or imbalanced 120 V loads off the same transformer. As was explained
earlier, this keeps both legs no more than 120V from the ground reference,
which is inherently safer. 

Split-phase is a very informative way to explain it.

Bill.



-----Original Message-----
From: Todd Cory, Mt. Shasta Energy Services
[mailto:toddcory at finestplanet.com] 
Sent: Thursday, May 12, 2005 10:36 AM
To: RE-wrenches at topica.com
Subject: Re: like, what's your phase? [RE-wrenches]

So why the heck do they call this single phase since it is split voltage
120/240 created with two phases.

I think of single phase as two wires with one only voltage and one phase
available. Most homes in the US are wired with 120/240.

Todd

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