CML CML Safe & Vault Servicing 2 — Questions and Answers
Question 1: What does the fire rating label 'UL Class 350-1 hour' mean on a safe?
- The safe interior will stay below 350°F for at least 1 hour in a fire (Correct answer)
- The safe can withstand a 350-pound impact for 1 hour
- The safe door can resist fire for 1 hour from the outside only
- The safe has a 350-minute fire rating
Correct answer: The safe interior will stay below 350°F for at least 1 hour in a fire
UL Class 350-1 Hour means the interior temperature will not exceed 350°F during a one-hour fire test, which is the threshold that protects paper documents.
Question 2: Which type of vault door locking mechanism uses multiple large bolts that extend in several directions simultaneously?
- Pivoting bolt system
- Swing bolt system
- Four-way bolt work (Correct answer)
- Single-throw deadbolt
Correct answer: Four-way bolt work
Four-way bolt work extends bolts in four directions (top, bottom, left, right) simultaneously, dramatically increasing forced-entry resistance.
Question 3: When servicing a Sergeant & Greenleaf (S&G) three-wheel combination lock, what is the standard method to set a new combination?
- Replace all three wheels with pre-set wheels
- Use the change key inserted in the back of the lock to set each wheel's gate position (Correct answer)
- Contact S&G for a factory reset code
- Drill out the existing combination and install a new lock
Correct answer: Use the change key inserted in the back of the lock to set each wheel's gate position
S&G combination locks use a change key inserted through the back or a special procedure to rotate each wheel's gate to the new combination numbers.
Question 4: What is the purpose of a 'day gate' feature found on some high-security combination locks?
- Allows the safe to open during daytime hours only via a timer
- Provides a single fixed position where the dial can stop for a day-use bypass
- Enables the safe to open with only a partial combination rotation for quick daytime access (Correct answer)
- Locks the safe automatically at end of business day
Correct answer: Enables the safe to open with only a partial combination rotation for quick daytime access
A day gate allows authorized users to open the safe with an abbreviated dialing procedure during business hours, while the full combination reactivates after hours.
Question 5: Which standard governs the residential security container (RSC) rating for burglary-resistant safes?
- UL 752
- UL 687 (Correct answer)
- ANSI/UL 1037
- UL 2050
Correct answer: UL 687
UL 687 is the standard for burglary-resistant safes, while the RSC (Residential Security Container) rating is a subset for consumer-grade units tested against hand tool attacks.
Question 6: After drilling a safe and completing repairs, a CML should:
- Leave the drill hole open for future access
- Plug the drill hole with a hardened steel insert and document the service (Correct answer)
- Replace the entire door
- Inform the customer the safe is no longer burglar-rated
Correct answer: Plug the drill hole with a hardened steel insert and document the service
Best practice requires plugging drill holes with hardened steel to restore security, then documenting the service entry for liability and warranty purposes.
CML CML Safe & Vault Servicing 2
What does the fire rating label 'UL Class 350-1 hour' mean on a safe?