Fire performance isn't simply the core; bracket alloys, screw grades, and coating systems all affect scores

https://www.scribd.com/document/1041186672/Leader-Boxes-Built-to-Last-The-Architect-s-Copper-Requirement-135654

Fire performance isn't simply the core; bracket alloys, bolt grades, and finish systems all influence ratings, so assemblies are evaluated with each other for real-world conformity.