breaker ties for circuits sharing neutrals

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shawnbebout

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What specific code article is it that states I need a breaker tie on circuits sharing a neutral? I had an "discussion" at work today and have the kids tonight, so I can't spend much time looking it up. The guys at work are trying to tell me that I can't use a "full boat" anymore and have to pull a seperate neutral for everything. Course they can't give me a code article, "someone told them that it's in there" type arguement and I would like to show them in the code book.
Thanks
Shawn
 
shawnbebout said:
What specific code article is it that states I need a breaker tie on circuits sharing a neutral? I had an "discussion" at work today and have the kids tonight, so I can't spend much time looking it up. The guys at work are trying to tell me that I can't use a "full boat" anymore and have to pull a seperate neutral for everything. Course they can't give me a code article, "someone told them that it's in there" type arguement and I would like to show them in the code book.
Thanks
Shawn
Click to expand...

210.4 (B). Tell 'em to buy a code book. You can still do the "full boat" but with this requirement. That's why they (full boat) are falling out of favor for many because of the new problems it creates.
 
Awesome, thanks. Apparently I did have time to do the research. I will have to explain a multi wire branch circuit to them. I tried explaining using a 12/4 MC home run to them and they didn't understand. I also explained breaker ties and was told "The owner of the building wouldn't like it, cause if one breaker trips, all three will trip." So they are going to add an extra HR of 3/4 GRC in a 25' ceiling and pull extra wire, so every circuit can have its own neutral.

I tried showing them how to do it with 9 current carrying conductors in a 3/4 GRC pipe. They want to put a seperate neutral for each circuit so they are gonna have 12 current carrying cconductors in 2 different 3/4's. Couse they also wanted to explore running 1-1" GRC for all 12 current carrying conductors. I had to explain deration to them as well.

Thanks guys,
Shawn
 
shawnbebout said:
"The owner of the building wouldn't like it, cause if one breaker trips, all three will trip."
Click to expand...
Not neccessarily, handle ties do not equal "common trip", the other breaker(s) may or may not trip. The requirement is only for disconnecting purposes, not for opening all ungrounded conductors OCPD's for a fault on one of the others.

Roger
 
Thanks for the welcome. Have been lurking for a bit, and have learned a lot in my short time here. :bye:
 
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