CPL Safe Manipulation & Lock Opening 3

Question 1

A UL-listed Group 2M combination lock differs from a standard Group 2 lock primarily in that it:

Accepted Answer

Includes a manipulation-resistant barrier or hardened components making manipulation harder

Answer

Group 2M locks meet UL requirements for manipulation resistance, incorporating design features like false gates, tight tolerances, and hardened materials.

Question 2

When drilling a safe to bypass the combination lock, the preferred entry point is typically:

Accepted Answer

A location that provides direct access to the relocker or lock bolt while avoiding hardplate

Answer

Locksmiths plan drill points to access the lock mechanism or relockers while routing around hardplate and glass relocker plates to minimize damage.

Question 3

What is a 'glass relocker' and when is it typically triggered?

Accepted Answer

A hardened glass plate that shatters under attack, releasing spring-loaded bolts that lock the safe permanently

Answer

Glass relockers are secondary locking devices that shatter when attacked by drilling or impact, causing additional bolts to engage and making opening much more difficult.

Question 4

The 'try-out key' method for opening certain types of safe deposit box locks works because:

Accepted Answer

The warding variations in guard lock keys are limited, allowing a set of keys to cover most locks

Answer

Safe deposit box guard locks have limited warding variations, so a set of try-out keys covers the range of possible ward configurations.

Question 5

In the context of safe manipulation, what does 'dialing in' or 'parking' a wheel mean?

Accepted Answer

Rotating the dial the correct number of turns to engage a specific wheel and position its gate

Answer

Parking a wheel means dialing far enough in the correct direction to engage that wheel and leave its gate at the desired position as subsequent wheels are set.

(CPL) Certified Professional Locksmith Practice Test

(CPL) Certified Professional Locksmith Practice Test

CPL Safe Manipulation & Lock Opening 3