How far must a conduit installed underground extend outside the building?

In accordance with the National Fuel Gas Code, the conduit that is installed underground must extend a specific distance outside the building to ensure proper safety and functionality. The requirement for a conduit to extend 4 inches outside the building is designed to prevent potential hazards associated with the conduit being too close to the building's foundation or any adjacent structures. This distance helps to provide ample protection against potential damage from water intrusion or movement in the soil, which could lead to damage to the conduit or any pipes within it.

This regulation also facilitates easier access for inspection and maintenance while ensuring that the conduit is securely positioned to mitigate any external impacts. Extending the conduit the appropriate distance beyond the building's outer wall is crucial for maintaining the integrity and safety of the gas piping system that it houses.