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Old 11-12-2005, 03:03 PM   #15
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I agree that calling it a two phase system is awkward terminology Usually we talk about either single phase or three phase.

That said, technically there are two 120v 'phases' is 240v systems. This is referenced in the code.

I prefer referring to them as the black and red legs.

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Old 11-12-2005, 03:04 PM   #16
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old lineman saying: if you don't know what it is don't touch it!

I believe 220 VAC is considered single-phase power from a lineman's perspective.
tom you are correct, a 240 volt service with 3 wires is single phase in lineman speak. however, each hot wire is considered a seperate phase.

a three phase service would have 3 or 4 wires depending on weather it was delta or wye connected.

here is a partial list of what you can get from the power company:

120v single phase 2 wire

120/240v single phase 3 wire

120/240v 3 phase delta 4 wire

240/480v 3 phase delta 3 wire (no neutral)

480v 3 phase delta 3 wire (no neutral)

120/208v single phase 3 wire (network)

120/208v 3 phase wye 4 wire

277/480v 3 phase wye 4 wire


you call them ferrets, i call them weasels.
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Old 11-12-2005, 03:06 PM   #17
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Thank you Mark. I, in this case was forced into learning some things that I did not previously know. That is the most important thing, and what I value most from this group, that I (we) learn things from each other that can save us time, money or health and safety.

I am a health adviser (communicable disease expert) and often times am entering buildings with other experts such as police, electrical inspectors, building officials, housing authorities etc. to determine if a structure is suitable for habitation.

In lockstep with the building guys I see a lot of really dangerous wiring jobs done by people who do not install it right. I am also required to compare notes with state fire Marshall's after buildings are leveled by poor wiring, and that is not a happy business I can tell you.

I came to this thread with a filter on, granted, and I think that is what you picked up on. I apologize for the passion on this subject but as you see, alot of this funnels past me at work so I am, perhaps, overly cautious, not knowing how much the person asking the advice knows.

Thank you for your kind patience and explaining and better clarifying the 110 and 220 load/shared neutral/ground scenario. I was thinking 220 and did not know that besides newer 50 amp 220 hook ups, 30 amp 220 is not done.

Anyway, I was not irritated just ignorant, wanting to be sure and telegraphing caution.

Thanks again. Thank you Squirrelly and good luck on your coach !

"It takes a village to raise a silver twinkie."

-Jim Phillips
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