310.10 Parallel conductors
What changed in 310.10
The parallel conductor rules were reworded; the requirements themselves didn't change.
Point by point
- Parallel conductors still have to be 1/0 AWG or larger.
The full lesson is in the Pro Version
Get the whole breakdown
- 3 more points on exactly what changed
- The 2020 rule next to the 2023 rule, side by side
- Why it changed
- What to do and check on the job
One membership unlocks every NEC® change lesson for 2020, 2023 and 2026, plus every video, quiz, flashcard and the Testing Center.
Checking your membership…
This section across NEC® editions
2020 NEC®No change
This section did not change from 2017 to 2020.
2023 NEC®RevisedYou're here
The parallel conductor rules were reworded; the requirements themselves didn't change.
2026 NEC®Revised
Where the code lets a conductor be bare, it can now be bare or have any covering in direct sun, even one not rated sunlight resistant.
Open the 2026 page →More 2023 changes in Article 310
This is a plain-English summary, not the NEC®'s exact wording. Always check the full section in the NEC® edition your area has adopted, plus any local amendments.
NEC® and National Electrical Code® are registered trademarks of the National Fire Protection Association (NFPA). Electrical Exam Coach is not affiliated with or endorsed by NFPA.
Find it faster on test day