500.7 Protection techniques
What changed in 500.7
New protection techniques were added for optical radiation, and the gas detection system rules were heavily reworked.
Point by point
- Four new protection techniques were added as 500.7(L) through (O).
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- 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
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This section across NEC® editions
2020 NEC®RevisedYou're here
New protection techniques were added for optical radiation, and the gas detection system rules were heavily reworked.
2023 NEC®Revised
Five new protection techniques, (P) through (T), were added, along with a table showing which equipment and protection types fit each area classification.
Open the 2023 page →2026 NEC®No change
This section did not change from 2023 to 2026.
More 2020 changes in Article 500
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.
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