Surface metal raceways with a metal thickness of less than 0.040 in. can be used where the voltage does not exceed what level?

Surface metal raceways with a metal thickness of less than 0.040 in. are regulated under specific guidelines to ensure safety in electrical installations. The correct answer indicates that these raceways can be used safely where the voltage does not exceed 300 volts.

This voltage limitation is significant because it correlates with the capabilities of the materials used in the raceway. A thickness of less than 0.040 inches suggests that the metal may not provide adequate protection against electrical faults or environmental factors at higher voltages. At 300 volts or lower, the risks of arcing and electrical failure are manageable, and the raceway can effectively contain and protect the wiring within it.

Understanding these specifications is essential for ensuring compliance with safety codes and regulations in electrical work. Choosing the appropriate raceway based on thickness and voltage helps prevent electrical hazards, such as shock or fire, associated with improper use of materials in electrical installations.