U.L. Ratings Guide


Burglar Resistant Classifications:

TL-15
TL-30
TRTL-30
TRTL-60
TXTL-60

Fire Resistant Classifications:

Class 150 - 4 Hours
Class 150 - 2 Hours
Class 150 - 1 Hour
Class 350 - 4 Hours
Class 350 - 2 Hours
Class 350 - 1 Hour

Burglar Resistant Classifications:

Burglar Resistant Classification TL-15
Combination-locked safe designed to offer a limited degree of protection against attack by any combination of common mechanical and electrical hand tools. Safe must successfully resist entry(1) 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.

Burglar Resistant Classification TL-30
Combination-locked safe designed to offer a moderate degree of protection against attack by any combination of common mechanical and electrical tools. The safe must successfully resist entry(1) 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.

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Burglar Resistant Classification TRTL-30
Combination-locked safe designed to offer a moderate degree of protection against attack by any combination of common mechanical, electrical, and cutting tools and/or cutting torches. The safe must successully resist entry(1) 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.)

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Burglary Classification TRTL-60
Combination-locked safe designed to offer a high degree of protection against attack by any combination of common mechanical, electrical, and cutting tools and/or cutting torches. The safe must successfully resist entry(1) 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 1,000 cubic feet combined total oxygen and fuel gas).

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Burglary Classification TXTL-60
Combination-locked safe designed to offer a high degree of protection against attack by any combination of common mechanical, electrical, and cutting tools and/or cutting torches, and high explosives. The safe must successfully resist entry(1) 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).

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Fire Resistant Container Classifications:

U.L. Label Type Class 150 - 4 hours (Insulated Record containers)
Container must maintain an interior temperature less than 150F and an interior relative humidity less than 85% when exposed to fire as per the Standard Time Temperature Curve for 4 hours to 2000F. Container must also successfully undergo all other requirements for the
Fire Endurance Test(2), the Explosion Hazard Test(3), the Humidity Test(5) and the Fire & Impact Test(4) (separately or combined(6)). In summary, no explosion should occur through 30 minutes of exposure to a 2000F fire, an immediate 30' drop test, and a standard reheating for 60 minutes to 1700.

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U.L. Label Type Class 150 - 2 hours (Insulated Record containers)
Container must maintain an interior temperature less than 150F and an interior relative humidity less than 85% when exposed to fire as per the Standard Time Temperature Curve for 3 hours to 1850F. Successfully undergo all other requirements for the Fire Endurance Test(2), the Explosion Hazard Test(3), the Humidity Test(4) and the Fire & Impact Test(4) (separately of combined(6)). In summary, no explosion through 30 minutes of exposure to a 2000F fire, 15 minutes of standard exposure to 1638F, an immediate 30' drop test, and a standard reheating for 60 minutes to 1638F.

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U.L. Label Type Class 150 - 1 hour (Insulated Record containers)
Maintain an interior temperature less than 150F and an interior relative humidity less than 85% when exposed to fire as per the Standard Time Temperature Curve for 3 hours to 1700F. Successfully undergo all other requirements for the Fire Endurance Test(2), the Explosion Hazard Test(3), the Humidity Test(4) and the Fire & Impact Test(4) (separately or combined(6)). In summary, no explosion through 30 minutes of exposure to a 2000F fire, an immediate 30' drop test, and a standard reheating for 30 minutes to 1550F.

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U.L. Label Type Class 350 - 4 hours (Fire resistant safes)
Maintain an interior temperature less than 350F when exposed to fire as per the Standard Time Temperature Curve for 4 hours to 2000F. Successfully undergo all other requirements for the Fire Endurance Test(2), the Explosion Hazard Test*, the Humidity Test(5) and the Fire & Impact Test(4) (separately or combined(6)). In summary, no explosion through 30 minutes of exposure to a 2000F fire, 30 minutes of standard exposure to 1700F, an immediate 30' drop test, and a standard reheating for 30 minutes to 1700F.

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U.L. Label Type Class 350 - 2 hours (Fire resistant safes)
Maintain an interior temperature less than 350F when exposed to fire as per the Standard Time Temperature Curve for 2 hours to 1850F. Successfully undergo all other requirements for the Fire Endurance Test(2), the Explosion Hazard Test(3), the Humidity Test(5) and the Fire & Impact Test(4) (separately or combined(6)). In summary, no explosion through 30 minutes of exposure to a 2000F fire, 15 minutes of standard exposure to 2000, an immediate 30' drop test, and a standard reheating for 45 minutes to 1638F.

U.L. Label Type Class 350 - 1 hours (Fire resistant safes)
Maintain an interior temperature less than 350F when exposed to fire as per the Standard Time Temperature Curve for 1 hour to 1700F. Successfully undergo all other requirements for the Fire Endurance Test(2), the Explosion Hazard Test(3), the Humidity Test(5) and the Fire & Impact Test(4) (separately or combined(6)). In summary, no explosion through 30 minutes of exposure to a 2000F fire, an immediate 30' drop test, and a standard reheating for 30 minutes to 1550F.

U.L. Test Descriptions

(1) Entry Test
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.

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(2) Fire Endurance Tests
For this test, the container has items placed inside it. Interior items must be in contact with the interior walls. The container is then closed, locked, and exposed to a uniformly distributed fire. The fire temperature is regulated and increased according to the Standard Time Temperature Curve. The fire is continued for the period required for the classification desired and allowed to cool without opening the furnace. The interior temperature is recorded throughout the test and during the subsequent cooling period until a definite drop is shown and must never exceed 150F or 350F as the case may be. Once cooled, the unit is opened, dismantled and its contents examined for usability. The units' locking mechanism and part fastenings are examined for security and the interior examined for any visible evidence of undue heat transmission. Regular production units must again pass the Fire Endurance Test, 1 year after the first test or 1 year after production of the tested unit began.

Standard Time Temperature Curve

Minutes

Temperature ° F

Minutes

Temperature ° F

5

1000°

120

1850°

30

1550°

180

1925°

60

1700°

240

2000°

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(3) Explosion Hazard Test
The container to be tested is emptied, closed, locked and placed into a furnace preheated to 2000F. This temperature is maintained for 30 minutes (20 minutes for units rated1/2 hour) and if no explosion results, the unit is allowed to cool without opening the furnace doors. Once cooled, the unit is opened, dismantled and examinations made regarding the heat insulating properties of the sample such as condition of interior finish, security of interior equipment, lock part fastenings, and any signs of undue transmission of heat or moisture.

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(4) Fire & Impact Test
After the units' contents are placed inside and in contact with the interior walls, the unit is closed, locked and exposed to the Standard time as in the Fire Endurance Test for the period of time stated for that classification. Within two minutes, the unit is removed from the furnace and dropped 30' onto a riprap of brick on a heavy concrete base. After impact, the unit is examined for deformation, rupture of parts, damaged insulation, and any other openings into the interior of the unit. When sufficiently cooled for handling the unit is inverted, reheated for the time stated and allowed to cool without opening the furnace doors. Once cooled, the unit is opened, dismantled and examinations made regarding the heat insulating properties of the sample such as usability of contents, condition of the interior finish, security of locks, part fastenings and any signs of undue transmission of heat or moisture.

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(5) Humidity Test
After pre-conditioning, the unit is heated for 12 hours to obtain an interior temperature of 70+or- 5F and a relative humidity of 50 +or- 15 percent. The unit must successfully maintain an interior relative humidity less than 85% during that part of the cooling period when the interior temperature is above 120F. Units are also examined for any signs of moisture penetration into the interior.

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(6) Combined Explosion Hazard - Impact Test
A manufacturer may opt to combine and conduct both the Fire-Impact Test and the Explosion Hazard Test on one sample fire resistant safe or insulated record container as follows:

  1. The Explosion Hazard Test is first conducted. If no explosion results during 30 minutes at 2000F, the furnace temperatures are to be reduced to those of the Standard Test Temperature Curve and the fire continued for an additional 30 minutes for units to be rated 4 Hours, and for an additional 15 minutes for units to be rated 2 Hours. No additional exposure is required for units to be rated 1 Hour.
  2. After exposure to the fire for the total period necessary for the classification desired, the furnace fire is to be extinguished and the test sample withdrawn. Within 2 minutes, the unit is dropped from 30' into the riprap of brick on a heavy concrete base, examined, reheated, and re-examined as per the requirements of the Fire And Impact Test.

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