208 volt circuit and receptacle

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LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
On a 208/120 system was is the minimum number of conductors I can use to install 2 15amp receptacles each on a dedicated circuit?

I assume there are only two choices? 3 or 4? :confused:
Yes, and, as you ask the question, the answer is four.
 
Okay, final questions.
Where can I find information on three phase to educate myself?

On a 208/120 system was is the minimum number of conductors I can use to install 2 15amp receptacles each on a dedicated circuit?

I assume there are only two choices? 3 or 4? :confused:


Try:

http://en.wikipedia.org/wiki/Three-phase_electric_power

http://www.3phasepower.org/

http://www.kilowattclassroom.com/IES12.htm

http://www.elec-toolbox.com/usefulinfo/xfmr-3ph.htm

Try searching this magazine - a good source of info
http://www.ecmag.com/?articleID=10080&fa=article
 

Greg1707

Senior Member
Location
Alexandria, VA
Occupation
Business owner Electrical contractor
Don't let the difference in voltage to ground or the third phase distract you in this case. It's just two hots and a two pole breaker per circuit, whether the panel is three phase or single.
Isn't there a disagreement between the last two posts? One says "disregard whether it is single phase or three phase" and Larry says four wires.

Okay, once again: three phase panel 208/120. I want to run two 120v 15 amp circuits to two separate receptacles. Excluding the equipment ground wire, what is the minimum number of wires? 2 hots and a neutral or 2 hots and 2 neutrals?
 
"three phase panel 208/120. I want to run two 120v 15 amp circuits to two separate receptacles.
Excluding the equipment ground wire, what is the minimum number of wires? 2 hots and a neutral or 2 hots and 2 neutrals?"

2 hots and a neutral is the minimum number of conductors as per above.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Okay, once again: three phase panel 208/120. I want to run two 120v 15 amp circuits to two separate receptacles. Excluding the equipment ground wire, what is the minimum number of wires? 2 hots and a neutral or 2 hots and 2 neutrals?
Well, now that you've changed the question, the answer is three.

Up till now, we've been using 208v to answer you, because you originally said:
I have a job installing a circuit for a 208 volt copy machine. The specifications call for a NEMA 6-15 2 pole, 3 wire, grounding rated at 250V/ 15AMP.

What is up with this? If I install this type of receptacle on a 208 volt circuit--what would prevent some unsuspecting person from plugging a 240V device into this receptacle?
Now, you want two 120v receptacles, which can share the grounded conductor.

This will work equally well on either a 120/240v or a 120/208v supply.
 
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