Manufacturer Instructions Trump Codes

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  • Manufacturer instructions must be followed. AND codes must be followed. [1] If codes impose additional requirements, talk to the AHJ.

More: And codes defer to manufacturer installation manuals and manuals defer to local codes. Somewhat circular argument. Once local is invoked, the AHJ has the authority to make things up, in which case you can challenge it if you don't like it. Cost-benefit depends on the situation. [2]