What is the primary purpose of boxes and conduit bodies according to the NEC?

The primary purpose of boxes and conduit bodies according to the National Electrical Code (NEC) is to allow free space for all enclosed conductors. This ensures that conductors can be properly organized and secured, which is vital for maintaining system integrity and preventing issues such as overheating or damage due to overcrowding or improper bending of wires. The NEC emphasizes the need for appropriate spacing within these enclosures to facilitate safe and code-compliant wiring practices.

While secure attachments for wiring, aesthetic appeal, and simplifying installation are considerations in electrical installations, they do not capture the fundamental requirement of providing adequate space for conductors, which is essential for safety and functionality in electrical systems.