CPL Key Systems & Key Control 3

Question 1

What does 'total position change' (TPC) refer to in key system design?

Accepted Answer

The number of unique change keys possible in a system

Answer

Total position change (TPC) is the total number of unique individual change key combinations available in a master key system.

Question 2

A key system that uses rotating elements rather than traditional pin tumblers for higher security is best described as a:

Accepted Answer

Disc detainer system

Answer

Disc detainer locks use rotating disc elements that must align precisely, offering high pick resistance and key control.

Question 3

In key system terminology, what is a 'keyway'?

Accepted Answer

The profile cut into the cylinder plug that accepts a specific key blade shape

Answer

The keyway is the shaped opening in the cylinder plug that matches the corresponding key blank profile, controlling which blanks can enter.

Question 4

What is the function of a 'control key' in a proprietary cylinder system?

Accepted Answer

It allows removal of the core from the cylinder for rekeying

Answer

A control key is used in interchangeable core (IC) systems to remove or insert the core, enabling rapid rekeying without tools.

Question 5

Which ANSI/BHMA grade rating indicates the highest performance level for locks used in key control systems?

Accepted Answer

Grade 1

Answer

ANSI/BHMA Grade 1 is the highest rating, indicating heavy-duty commercial performance and the strongest security standards.

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