Conduit fill-DeRating

[High Peak]

On a 20 amp circuit on a dimmer panel, how many number 10 thnn current carrying conductors are allowed in a 1" EMT conduit without derating?
How many equipment grounding conductors do you need in the same conduit and what size?

 

[480sparky]

Sounds like a homework question.

What answers did you come up with?

 

[raider1]

On a 20 amp circuit on a dimmer panel, how many number 10 thnn current carrying conductors are allowed in a 1" EMT conduit without derating?

3, take a look at 310.15(B)(2)(a).

Or are you asking how many #10 can be installed in a 1" conduit before the derated ampacity is below 20 amps?

How many equipment grounding conductors do you need in the same conduit and what size?

Take a look at 250.122(B) and (C).

Chris