422.12 Central heating equipment
What changed in 422.12
More types of equipment are allowed on the furnace circuit.
Point by point
- Exception No. 1 now covers similar equipment tied to the heating unit, not just the pumps, valves, humidifiers and air cleaners it names.
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- 3 more points on exactly what changed
- The 2023 rule next to the 2026 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®No change
This section did not change from 2017 to 2020.
2023 NEC®No change
This section did not change from 2020 to 2023.
2026 NEC®RevisedYou're here
More types of equipment are allowed on the furnace circuit.
More 2026 changes in Article 422
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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