Bundling question

[Stevenfyeager]

How many 12-2 cables zip tied together and what distance would be considered ‘bundling’
or would be considered a heat buildup possibility? Thank you.

 

[augie47]

Five and > 2 ft

 

[infinity]

Two cables zip ties together are bundled. As Augie stated after 4 cables the derating will lower the 20 amp rating associated with #12 AWG.

 

[Stevenfyeager]

Five and > 2 ft

 

[wwhitney]

Just a quick note that the previous answers assume a 30C or less ambient temperature. If bundling occurs in a higher ambient temperature (say a typical unconditioned residential attic), then bundling can cause significant derating with fewer than (5) 12-2 cables.

Cheers, Wayne

 

[infinity]

Where did you come up with (5) 12-2's?

Because that is 10 CCC'S which requires a derating to 50%.

30*50%=15 amps no good for 20 amps.

9 CCC'S would be 30*70%=21 amps good for a 20 amp circuit.

 

[Rick 0920]

Because that is 10 CCC'S which requires a derating to 50%.

30*50%=15 amps no good for 20 amps.

9 CCC'S would be 30*70%=21 amps good for a 20 amp circuit.

I see that now. I didn't understand Gus' reply at first. my initial thought was what you said in your post. Two cables would be bundling as you would have (4) CCC

 

[infinity]

I see that now. I didn't understand Gus' reply at first. my initial thought was what you said in your post. Two cables would be bundling as you would have (4) CCC

Yeah Gus just gave us a shortcut to the no more than 9 CCC'S rule of thumb for #12 NM cables.