Test buttons: Use the test buttons whenever you want to test a GFCI or AFCI breaker. Simply press the button to disrupt the electrical current, then check to see if the breaker tripped as intended.

Breaker or Fuse (amps) Min. copper wire size (AWG) 15 14 20 12 30 10 40 8 55 6 70 4 For the full story, you'd have to start with table 310.15(B) (16) in the National Electric Code, but there are a ...