In the context of cross-manufacturer compatibility, what data does the AHJ typically rely on?

• A. The color of the concentrate
• B. Manufacturers' data
• C. System age
• D. Market availability

Answer: (B)

Cross-manufacturer compatibility relies on data published by the manufacturers themselves. The AHJ uses this information because it directly shows how devices or components from different brands will interoperate safely and as designed. This includes compatibility matrices, installation and wiring diagrams, performance and test results, and listing or approval documents from recognized labs that verify cross-brand interoperability. While standards and codes guide the approval, the concrete evidence comes from the manufacturers’ data about how their products interact with others. The color of a concentrate, the age of the system, or market availability don’t provide technical proof of compatibility, so they aren’t what the AHJ depends on when assessing cross-brand compatibility.