What is the relationship between the inside diameter of a conduit and the outside diameter of the wire bundle inside it?

The correct answer highlights an important consideration in the design and installation of electrical conduits. The conduit should indeed be larger than the wire bundle to allow for proper handling, installation, and future maintenance. A conduit that is 25% larger than the diameter of the wire bundle provides sufficient space for the wires to fit comfortably without excessive pressure, which could lead to wear or insulation damage. This clearance also helps accommodate any additional wiring or components that may need to be added later, ensuring that there is adequate room to manage the wiring effectively.

Choosing a conduit size that is exactly equal to the wire bundle or smaller can hinder installation, restrict airflow, and create further complications such as heat build-up. These factors underscore the importance of selecting a conduit size that exceeds the diameter of the wire bundle by a sufficient margin, which is aligned with established electrical codes and best practices for installation.