CML CML Safe & Vault Servicing 2

Question 1

What does the fire rating label 'UL Class 350-1 hour' mean on a safe?

Accepted Answer

The safe interior will stay below 350°F for at least 1 hour in a fire

Answer

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?

Accepted Answer

Four-way bolt work

Answer

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?

Accepted Answer

Use the change key inserted in the back of the lock to set each wheel's gate position

Answer

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?

Accepted Answer

Enables the safe to open with only a partial combination rotation for quick daytime access

Answer

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?

Accepted Answer

UL 687

Answer

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.

(CML) Certified Master Locksmith Practice Test

(CML) Certified Master Locksmith Practice Test

CML CML Safe & Vault Servicing 2