Is a double tap ever ok?

My training tells me to call out double taps but are there breakers and situations where circuit breakers can be double tapped?

Yes, on those rated for it.

Here is an example

http://www.nachi.org/forum/attachments/f19/6793d1163122524-double-lugged-square-d-breakers-twowirebreaker.jpg

Example of Square D:

Square-D-Breaker-440x340.jpg

And the wires don’t need to be the same gauge, as long as they fit within the scope of the breaker (#14 - #10 in the case above)?

Correct.

So for the sake of further discussion…

I don’t consider a breaker designed for two wires to be “double tapped”. It is installed and used as designed.

I consider a “double tap” as a breaker designed for a single conductor that has two conductors instead. Some may consider it a matter of semantics but I think it is a matter of using the correct terminology.

Further discussion?

I agree. No breaker can be double tapped, but some breakers are designed and listed to have two conductors installed.

A double tap is always a defect.

I agree

How would you handle OCP with two different gauges?

Sorry, what’s OCP?

Over current protection

Good question. In posts 4 & 5 I asked if two different gauges could be used and I was answered yes. I would defer to the limits of the smaller gauge wire if two differently sized wires were on a breaker that can accept two wires.

I’ve always been under the impression the two wires must be the same guage. And usually you’d be talking about #14 and #12. #10 is for a 30 amp circuit and probably dedicated equipment.

I don’t see that Square D QO CB’s listed for two conductors require that they be the same size. They just need to fall within the range listed on the CB.

https://lh4.googleusercontent.com/cGkGM9E6tIf1-iM4wItIfMVBnJVgef100AL4tZhB2UY=w884-h786-no

You’ve got it Robert. Thanks.

Hey, Robert, email Nick at fast reply@nachi.org and request a login so you don’t have to be moderated. He wanted to give you, and a couple of others that help out around here, one in another thread but I don’t see that thread just now.

That was the panel inspection thread with the giveaways for contributing.

Thanks, Jim. I think you were mentioned and could do the same.
:slight_smile:

Larry, I have the information, but am not moderated now AFAIK so I left it as is.

Thanks Larry, my posts appear right after I hit the reply so I’m assuming that I’m not moderated?