There is a happy medium between no delegation and full delegation of the fire protection system. 

The requirements of residential sprinkler systems are similar across the three installation standards, with a few variations to provide cost-saving options for homeowners. Where additional protections are necessary or desired, it is up to the engineer to specify.

The use of UL-listed antifreezes helps meet the intent of NFPA freeze protection requirements and the requirement of using an agency-listed antifreeze in both new and existing systems.