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Old 05-14-2013, 10:34 PM   #1
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


I need to replace several circuit breakers and just noticed that there are both "15-20" and "20-20" circuit breakers in the electrical box. Is that okay or do I need to make sure they are consistent? Thanks!

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Old 05-14-2013, 11:41 PM   #2
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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I need to replace several circuit breakers and just noticed that there are both "15-20" and "20-20" circuit breakers in the electrical box. Is that okay or do I need to make sure they are consistent? Thanks!
Just make sure the wires are on the correct size breaker. How they are arranged doesn't matter.

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Old 05-15-2013, 05:30 AM   #3
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


Why do you need to replace breakers?
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Old 05-15-2013, 06:41 AM   #4
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


OK, I'll bite. What is a 15-20 circuit breaker? I've never seen a breaker so labeled.
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Old 05-15-2013, 06:45 AM   #5
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Can you mix 20 and 15-20 circuit breakers in same electrical box?




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Old 05-15-2013, 06:52 AM   #6
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


If you are thinking about upping the breaker because the circuit is tripping, please do not do it. You would be creating a fire hazard.

Breakers rarely go bad, so replacing one let alone a couple raises some eyebrows.
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Old 05-15-2013, 06:59 AM   #7
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


having different size breakers is OK what you dont want is different brands as not all breakers are UL listed for different panels. If you are unsure it is best to match the breakers to the panel by manufacture
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Old 05-15-2013, 10:00 AM   #8
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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Well, I've never seen one of those. I learn something every time I come here.
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Old 05-15-2013, 10:03 AM   #9
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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Well, I've never seen one of those. I learn something every time I come here.
Sieman's has them as does a lot of other manufacturers.
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Old 05-15-2013, 10:11 AM   #10
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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Well, I've never seen one of those. I learn something every time I come here.
Square D makes some funky stuff, like this "Quad" 20-30-20 breaker:
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Can  you mix 20 and 15-20 circuit breakers in same electrical box?-homeline_quad.jpg  
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Old 05-15-2013, 11:11 AM   #11
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


All manufacturers that I know of make tandem breakers of just about any combo you would like.
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Old 05-15-2013, 02:07 PM   #12
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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Sieman's has them as does a lot of other manufacturers.
What's the advantage? Are they cheaper than two separate breakers in one slot?
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Old 05-15-2013, 02:10 PM   #13
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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What's the advantage? Are they cheaper than two separate breakers in one slot?
If anything, they're more expensive. The reason they make them is for people who's panel is full, but need to add more circuits. A tandem is cheaper than ripping out a whole panelboard and installing a bigger one.

It's better to just install a 40-space panel to begin with, and only fill it half full with full-size breakers at construction.
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Old 05-15-2013, 04:17 PM   #14
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


Not all panels are rated for tandem breakers. And some panels that are, limit where you can locate the tandem on the buss.
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Old 05-15-2013, 05:09 PM   #15
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Can you mix 20 and 15-20 circuit breakers in same electrical box?


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If anything, they're more expensive. The reason they make them is for people who's panel is full, but need to add more circuits. A tandem is cheaper than ripping out a whole panelboard and installing a bigger one.
So what's the point of using them? Since they're cheaper, why not instead use two separate tandem breakers instead of the more expensive "combined" ones?

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