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Anonymous Poster

Two-Pole Connection

10/16/2009 10:55 AM

Hello!

I have circuit connect on 2 pole breakder in 120/208v panel connect phase-phase. For power calculation do I use:

P=208*I*PF

If not what do I use please? What do we call this, 2-phase? 1-phase?

Thankyou!
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Yuri B.
Power-User

Join Date: Jun 2009
Posts: 262
Good Answers: 1
#1

Re: 2 pole connection

10/16/2009 11:16 AM

Correct if you know the values of V, I , and PF.

For me phase-neutral voltage is "phase voltage",

phase-phase voltage is "line voltage",

so there is no "phase voltage" in the supply whose transformer is delta connected,
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msamad
Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#2
In reply to #1

Re: 2 pole connection

10/16/2009 11:16 PM

The power formula is correct.

It is still 1 phase (line to line or 2 hot wire) supply. Unlike phase to neutral supply, you have to use protection in both lines (either by 2 pole breaker or fuses in both lines).

The idea of 2 phase supply (4 wire system) is completely different and it is an old system, not used now a day (http://en.wikipedia.org/wiki/Two-phase_electric_power).

- MS

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joseph sithole
Active Contributor

Join Date: Oct 2009
Posts: 24
#3

Re: Two-Pole Connection

10/17/2009 12:40 AM

Hi,

What is connected to this supply- load?

Formular is correct

P=V*I*PF

Thanks,

Joseph
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ikhanuk
Commentator

Join Date: Aug 2009
Posts: 91
#4

Re: Two-Pole Connection

10/21/2009 5:09 AM

it is the voltage line to line 208 -----if it is 120 then it is line to phase

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