Which of the following is a requirement for Flexible Metal Conduit (FMC) when filling with conductors?

The requirement for Flexible Metal Conduit (FMC) when filling with conductors is determined by regulatory codes, which set specific limits on the fill percentage to ensure safety and proper operation of the electrical system. The correct option notes that the fill percentage should not exceed the limits indicated in the code. This is crucial because overfilling the conduit can lead to overheating, which poses a significant fire hazard as well as potential damage to the conductors due to excessive heat buildup.

Adhering to the maximum fill percentage ensures that there is adequate space for heat dissipation and that the conductors can be easily pulled through the conduit without excessive friction or damage. Each code, such as the National Electrical Code (NEC), provides guidelines that help electricians and engineers maintain a safe and efficient electrical installation.