How many cubic feet should securely installed boxes and fittings not exceed if they do not support fixtures or contain devices?

Securely installed boxes and fittings that do not support fixtures or contain devices should not exceed a maximum volume of 100 cubic feet. This limit is established to ensure safe practices in electrical installations, preventing overcrowding of electrical boxes, which can lead to overheating, poor connections, or fire hazards.

Maintaining this limit is crucial for proper wiring practices and ensuring that the installation complies with safety standards. By keeping the cubic volume within this specified amount, it facilitates adequate spacing for wires and helps maintain the integrity of the electrical system.