NEC® Changes · 2020 NEC®

110.22 Labeling disconnects

RevisedChanged in the 2020 NEC® (from the 2017 NEC®)· Updated October 24, 2026

What changed in 110.22

Outside one- and two-family homes, disconnects now have to be marked with the source that feeds them and where that source is.

Point by point

  • Except at one- and two-family dwellings, a disconnect's marking must now name the circuit source that feeds it.

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

Outside one- and two-family homes, disconnects now have to be marked with the source that feeds them and where that source is.

2023 NEC®Revised

Outside one- and two-family homes, a disconnect's label now has to show both the source that feeds it and where that source is located.

Open the 2023 page →
2026 NEC®No change

This section did not change from 2023 to 2026.

More 2020 changes in Article 110

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

Get a code book that's already tabbed and highlighted.