Two conductors on a 3? breaker

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chris kennedy

chris kennedy

Senior Member
Location
Miami Fla.
Occupation
60 yr old tool twisting electrician
I was asked today if this would fly. My first thought was yes, if the rating, slash rating was in line with the applied voltage. Then the wheels got turning and I can't be sure.

I have looked at 240 and 408 and also searched for a thread I remember that touched on this.



Little help please.
 
Dennis Alwon

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
chris kennedy said:
I was asked today if this would fly. My first thought was yes, if the rating, slash rating was in line with the applied voltage. Then the wheels got turning and I can't be sure.

I have looked at 240 and 408 and also searched for a thread I remember that touched on this.



Little help please.
Click to expand...

If you are asking if you can use a 3 pole breaker and only use 2 poles then the answer is yes. :D. I don't know that there is a code reference but the breaker will trip with overload, short circuit or ground fault on any pole or combo thereof.
 
B

benaround

Senior Member
Location
Arizona
Chris, My thought would be that the code says the conductors need protection, and the

3 pole c.b. will provide that protection.
 
chris kennedy

chris kennedy

Senior Member
Location
Miami Fla.
Occupation
60 yr old tool twisting electrician
benaround said:
Chris, My thought would be that the code says the conductors need protection, and the

3 pole c.b. will provide that protection.
Click to expand...

Thank you both, my first thought also.

If the conductor range of the breaker is taken into consideration for heat sink purposes and one is missing, is this a problem?
 
Dennis Alwon

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
chris kennedy said:
Thank you both, my first thought also.

If the conductor range of the breaker is taken into consideration for heat sink purposes and one is missing, is this a problem?
Click to expand...

Now you are using too many words. Also who you calling an old man-- I can stillvdance all night at my young age.
 
J

jim dungar

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Location
Wisconsin
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PE (Retired) - Power Systems
chris kennedy said:
If the conductor range of the breaker is taken into consideration for heat sink purposes and one is missing, is this a problem?
Click to expand...
No, the heat sink effect is only for those poles carrying current - no conductor, no current, no problem.

When I read your OP, my first thought was two conductors in one lug.
 
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