590.8 Temporary overcurrent devices
What changed in 590.8
Reused overcurrent devices must be examined before going into temporary wiring, and temporary services over 150 volts to ground on grounded wye systems need current-limiting devices.
Point by point
- Overcurrent devices that were used before must be examined before they go into a temporary installation.
The full lesson is in the Pro Version
Get the whole breakdown
- 3 more points on exactly what changed
- The 2017 rule next to the 2020 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®RevisedYou're here
Reused overcurrent devices must be examined before going into temporary wiring, and temporary services over 150 volts to ground on grounded wye systems need current-limiting devices.
2023 NEC®Revised
For temporary services, current-limiting overcurrent devices are now only required on certain 3-phase wye systems when the available fault current is over 10,000 amps.
Open the 2023 page →2026 NEC®No change
This section did not change from 2023 to 2026.
More 2020 changes in Article 590
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