By how many degrees can an installed escalator exceed the code's specified angle of inclination?

The correct answer is 1 degree because industry codes and standards often specify the maximum allowable angle of inclination for escalators to ensure safe and reliable operation. In many cases, this maximum inclination is defined to prevent excessive slope, which could compromise passenger safety and operational performance.

Allowing an escalator to exceed this specified angle by up to 1 degree provides a margin of tolerance for slight variations during installation or structural settling without significantly increasing risk. This controlled flexibility recognizes that minor deviations can occur in practical applications. By adhering to this strict limit, the safety and comfort of passengers using the escalator are maintained while ensuring compliance with established regulations.

The other options suggest larger permissible angles that would likely exceed safe operational thresholds, potentially leading to increased risks such as difficulty in boarding and alighting, or issues with escalator stability and performance.