North Carolina Locksmith Practice Exam

Which UL rating indicates a mechanical combination lock that is X-Ray resistant along with other specifications?

1. Group 1

2. Group 2

3. Group 1R

4. Group 2M

The correct answer is: Group 1R

The Group 1R rating specifically indicates that the mechanical combination lock is designed to be resistant to X-ray attacks, in addition to meeting other stringent performance standards. This rating denotes that the lock has enhanced security features that protect against various forms of unauthorized manipulation, including physical attacks, making it suitable for high-security environments. In contrast, Group 1 locks provide basic security measures without the particular X-ray resistance, while Group 2 locks are designed with additional security features but do not typically include the X-ray resistance either. Group 2M locks, although they may offer additional features, are generally not classified under the same standards for X-ray resistance as Group 1R locks. Hence, the designation of Group 1R specifically highlights its advanced security capabilities and specialized resistance to X-ray threats.