1.1 These requirements cover vault doors and vault modular panels (for use in the construction of vault floors, walls, and ceilings) of the type intended for use in financial institutions, commercial, industrial and mercantile properties, and the like, and that are relied upon to protect the contents from burglary attack.
1.2 These requirements are intended to establish the burglary resistant rating of vault doors and modular panels according to the length of time they withstand attack by common mechanical tools, electric tools, cutting torches, or any combination of these means. The ratings based on the net working time to effect entry are as follows:
a) Class M – 1/4 hour.
b) Class 1 – 1/2 hour.
c) Class 2 – 1 hour.
d) Class 3 – 2 hours.
1.3 These requirements do not cover attacks with the burning bar (thermal lance) or explosives.