Which type of conduit is not a permitted method for service entrance conductors?

Study for the National Electrical Code (NEC) Article 230 Exam. Prepare with challenging questions and detailed explanations. Master the material and boost your confidence before the test!

The correct answer highlights that wooden conduit is not a permitted method for service entrance conductors under the National Electrical Code (NEC). The NEC establishes guidelines to ensure that materials used for electrical installations meet safety standards. While rigid metal conduit, liquidtight flexible metal conduit, and electrical nonmetallic tubing are all suitable and permissible materials for protecting service entrance conductors, wooden conduit does not provide the necessary protection and durability required for electrical installations.

Service entrance conductors are subject to environmental conditions and require conduits that can withstand these conditions, resist corrosion, and provide mechanical protection. Wooden conduits lack the structural integrity and protective characteristics of metal or nonmetallic conduits, which is why the code does not permit their use for this specific application. This helps to ensure safety and reliability in electrical systems.

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