Who enforces the code and can approve alternatives

What the code requires

The NEC is written to be adopted into law by government bodies, usually a state, county or city. Once it is adopted, the enforcing official is what the code calls the authority having jurisdiction, or AHJ. For most jobs, that means your building department and your inspector.

Under 90.4(B), the AHJ interprets the rules, decides whether equipment and materials are approved, and grants the special permission that some rules call for. The code defines special permission as the written consent of the AHJ.

Under 90.4(C), the AHJ may waive a specific requirement or allow an alternative method, but only by special permission and only where the alternative achieves equivalent objectives by establishing and maintaining effective safety. Under 90.4(D), if the code requires a new product that is not yet available, the AHJ may accept products that comply with the most recent earlier edition that jurisdiction adopted.

In the 2023 edition, these powers are organized into lettered parts, (A) through (D). The reorganization did not add any new authority.

On the job

• Get any waiver or alternative method approved in writing before the work is done. A verbal okay in the field is not the same as special permission, which the code defines as written consent.
• If an inspector rejects work, ask which code section it violates. Mike Holt's commentary on this section says a rejection should cite the specific rule.

Related sections

• NEC 90.2
• NEC 90.5
• NEC 110.2
• NEC 110.3(B): Install equipment per its listing instructions

Where this comes from

• NFPA: Article 90 and Electrical Inspectors (Mar 22 2023)
• Oregon BCD: 2023 Oregon Electrical Specialty Code, Table 1-E (2023 NEC text)
• Mike Holt: Summary of the 2023 Changes to the NEC
• Mike Holt: Understanding the 2020 NEC, 90.4 (background)
• Read the official NEC free at NFPA