How many times the size of pull boxes should a straight-through installation be?

In a straight-through installation, the size of pull boxes is critical for ensuring both functionality and safety during wiring processes. The standard guideline is that a pull box should be at least eight times the size of the conduit or raceway that leads into it. This sizing allows for sufficient space to make wire connections, maneuver conductors, and ensure that there is enough room for any necessary bends in the wiring. Adequate sizing of pull boxes minimizes the risk of stress on the conductors and helps to maintain the integrity of the system over time.

Therefore, selecting the option indicating eight times the size aligns with the best practices in electrical installation and ensures compliance with code requirements. The reasoning behind this standard involves both safety and practicality, ensuring that technicians can efficiently work within the confines of the installation without risk of damage or complications.