Applying Conductor Adjustments & Corrections- Simple Example II

[@mikecruce9933]

I had a question like this on my Michigan Journeyman's Test, thank you for explaining this it really helped!

[@dja711]

Thank you for the video I have a job site situation. I have 9 circuits (general use receptacles) to run in a 1 inch EMT. So 18 current carrying conductors. number 12 thhn. So 50 percent adjustment on 30 amp wire. Is that ok on a 20 amp breaker. Thank you.

[@MasterTheNEC]

Greetings David - Typically you would do 30A x .50 = 15 Amps rated conductor, assuming you used wire rated 90°C in the first place. Now, you have to protect a conductor at its ampacity and now its 15 amps...so under 240.6(A) you have a 15 Amp rated OCPD available. You would need to use a 15 A rated protection device.

[@dja711]

@@MasterTheNEC thank you very much.