Model codes are enforceable when:

Model codes are enforceable when:

• A. The AHJ adopts them
• B. The codes are in revision
• C. They are in their original form
• D. They are based on NFPA standards

Answer: (A)

Model codes become enforceable only after the local Authority Having Jurisdiction adopts them into law. The AHJ—such as the city, county, or fire authority—enacts the code (often with amendments) so it can be enforced through permits, inspections, and citations. Without formal adoption, the codes remain voluntary or referential. Merely being in revision, existing in their original form, or being based on NFPA standards does not make them enforceable unless the AHJ adopts them.