The following are a list of the Underwriters Laboratory (U.L.) Rating Labels and their performance requirements:

Burglary Classification TL-15
Signifies a combination-locked safe designed to offer a limited degree of protection against attack by common mechanical and electrical hand tools and any combination of these means. Has sucessfully resisted entry* for a net working time of 15 minutes when attacked with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills, pressure applying devices or mechanisms. 

Burglary Classification TL-30
Signifies a combination-locked safe designed to offer a moderate degree of protection against attack by common mechanical and electrical tools and any combination of these means. Has successfully resisted entry* for a net working time of 30 minutes when attacked with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills, pressure applying devices or mechanisms, abrasive cutting wheels and power saws.

Burglary Classification TRTL-30
Signifies combination locked safe designed to offer a moderate degree of protection against attack by common mechanical and electrical tools and cutting tools and cutting tourches and any combination of these means. Has successfully resisted entry* for a net working time of 30 minutes when attacked with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills, pressure applying devices or mechanisms, abrasive cutting wheels, power saws, impact tools and oxy-fuel gas cutting or welding torch (test gas limited to 1000 cubic feet combined total oxygen and fuel gas.)

Burglary Classification TRTL-60
Signifies a combination-locked safe designed to offer a high degree of protection against attack by common mechanical and electrical tools and cutting torches and any combination of these means. Has successfully resisted entry* for a net working time of 60 minutes when attacked with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills, pressure applying devices or mechanisms, abrasive cutting wheels, power saws, impact tools and oxy-fuel gas cutting or welding torch (test gas limited to 1000 cubic feet combined total oxygen and fuel gas).

Burglary Classification TXTL-60
Signifies a combination-locked safe designed to offer a high degree of protection against attack by common mechanical and electrical tools and cutting tools and cutting torches, high explosives and any combination of these means. Has successfully resisted entry* for a net working time of 60 minutes when attacked with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills, pressure applying devices or mechanisms, abrasive cutting wheels, power saws, impact tools, and oxy-fuel gas cutting or welding torch, nitroglycerin or other high explosives equivalent to not more than 4 ounces of nitroglycerin in one charge (entire test must not use more explosive than that equivalent to 8 ounces of nitroglycerin).

*Entry means for:
Safes classed TL-15 and TL-30 - Opening the door or making a 6 square inch opening entirely through the door or front face.

Safes classed TRTL-30-, TRTL-60, and TXTL-60 - Opening or making a 2 inch square opening entirely through the door or body.