In weather-exposed service raceways, which construction is specified for enclosing service entrance conductors and allowing drainage?

• A. Flexible nonmetallic conduit
• B. PVC conduit with drainage
• C. No special drainage requirement
• D. Threaded rigid metal conduit and drain

Answer: (D)

Weather exposure means the raceway must be durable outdoors and able to shed moisture that can collect inside. A threaded rigid metal conduit is designed for outdoor use, providing strong mechanical protection and a weatherproof seal at the joints. When it’s equipped with a drain, any condensation or infiltrated water can escape, preventing water from pooling inside the raceway and protecting the service conductors from moisture-related damage. Other options either lack a reliable drainage path, aren’t as weatherproof for outdoor service entrances, or would require additional provisions not typical for standard weather-exposed installations. So, the configuration that both encloses the conductors and allows drainage is threaded rigid metal conduit with a drain.