What is the monthly gating interlock tolerance?

• A. Functional
• B. 1%
• C. 2%
• D. ±1 mm

Answer: (A)

The main idea is that some safety-critical parts are judged by how they perform, not by an exact measurement. For a monthly gating interlock, what matters is that it operates reliably—engages and disengages correctly under the expected conditions. That’s what a functional tolerance captures: the acceptable outcome is determined by function, not by a specific size.

If the interlock consistently performs its intended function, the tolerance is met even if there are small dimensional variations due to manufacturing or wear. In contrast, numeric tolerances like a percentage or a millimeter limit impose fixed size constraints, which may not directly relate to whether the interlock works safely. So the functional tolerance best aligns with the requirement for the interlock’s correct operation.