U.L. Residential Security Container Rating (RSC)

This UL rating is based on testing conducted for a net working time of five minutes, on all sides, with a range of tools. Underwriters Lab conducts the test and provides certification to the safe manufacturers.  
See U.L. TL-15 and TL-30 descriptions below for "net working time" description.

Burglary Classification Residential Security Container (RSC) signifies a combination or keylocked unit designed to offer protection against entry by common mechanical tools. Performance tests are conducted against the entire unit. The basic standard used to investigate in this category is UL 1037, "Anti theft Alarms and Devices.

1. An Anti-theft device, as defined by Paragraph 1.3, shall resist at least 5 minutes of attack that would defeat its purpose.
2. Any disassembly of the protected property required to make it removable, is to be included in the 5 minutes of attack test.
3. The tools used in the test are to include hammers, chisels, adjustable wrenches, pry bars, punches and screwdrivers. The hammers are not to exceed 3 pounds in head weight, and no tool is to exceed 18 inches in length.
4. The product under test is to be mounted securely in its intended position, and the attack is to be carried out by one operator.