HOLT Electricians Practice Exam

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Which of the following wiring methods is permitted in Class I Division I locations?

  1. Flexible rubber conduit

  2. Non-metallic conduit

  3. Threaded rigid metal or steel intermediate metal conduit

  4. Standard plastic boxes

The correct answer is: Threaded rigid metal or steel intermediate metal conduit

In Class I Division I locations, where flammable gases or vapors are present in the atmosphere, it is paramount to use wiring methods that ensure safety and reduce the risk of ignition. Threaded rigid metal or steel intermediate metal conduit is designed to provide a robust barrier against the entry of gases, vapors, and accidental physical damage, making it suitable for these hazardous environments. Rigid metal conduit is highly resistant to corrosion and offers a high degree of protection for the electrical conductors it houses, effectively minimizing the risk of electrical sparks that could ignite flammable substances. The thread design of the conduit allows for secure connections, ensuring tight fits that prevent the ingress of hazardous materials. Therefore, selecting this type of conduit aligns with the National Electrical Code (NEC) requirements for electrical installations in hazardous locations, ensuring both safety and compliance.

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