What is the maximum fill percentage for conductors in removable cover nonmetallic raceways?

The maximum fill percentage for conductors in removable cover nonmetallic raceways is indeed 75 percent. This is established in the National Electrical Code (NEC), which outlines the requirements for raceway fill to ensure safety and prevent overheating.

By allowing a maximum of 75 percent fill, the NEC aims to provide sufficient space for heat dissipation among the conductors, which is essential for maintaining proper operating temperatures. Overfilling a raceway can lead to increased resistance, excessive heat generation, and potentially hazardous conditions, such as insulation failure or fire. Thus, adhering to the 75 percent fill limit helps promote safe and effective electrical installations.

Considering the other fill percentages, 50 percent, 60 percent, and 85 percent do not align with the code requirements for nonmetallic raceways, making them unsuitable as the correct answer in this context.