Which option is not a method for routing conduits through a roof?

Routing conduits through a roof requires specific methods that ensure both structural integrity and protection from the elements. The correct choice highlights that "overhang" is not a conventional or recognized method for routing conduits.

Roof overhangs are typically designed to extend beyond the walls of a building to protect the structure from rainwater. While they serve as a protective feature, they do not provide a designated channel or method for installing electrical conduits. This makes it impractical to consider overhangs as a valid routing option for conduits.

Conversely, penetration refers to creating an opening through the roof for conduits to pass through, ensuring a secure and waterproof seal around the conduit. Surface-mounting involves attaching conduits to the surface of the roof, which can be an effective way to route wiring without compromising the integrity of the roofing material. Underlaying generally indicates placing conduits below a certain layer for protection or concealment, aligning with standard practices for moisture management in roofing systems.

Understanding the function and limitations of each method is essential for ensuring that electrical installations are safe and compliant with building codes while also protecting the wiring from potential damage caused by environmental factors.