A residential clothes-dryer branch circuit uses 10 AWG copper conductors with an allowable ampacity of 30 amperes after all applicable corrections. No special overcurrent-protection exception applies. Under 2024 IRC Table E3705.5.3, what is the maximum permitted breaker rating for these conductors?
- A15-ampere
- B20-ampere
- 30-ampere
- D40-ampere
Where to look it up
https://codes.iccsafe.org/content/PHXRC2024P1/chapter-37-branch-circuit-and-feeder-requirements
Why C is correct
The copper-conductor overcurrent limit for 10 AWG is 30 amperes. A 40-ampere breaker exceeds that limit. Source: ICC official 2024 IRC, unchanged provisions reproduced in the Phoenix adopted edition. https://codes.iccsafe.org/content/PHXRC2024P1/chapter-37-branch-circuit-and-feeder-requirements