Thank you for visiting In Class II Division 1 hazardous locations where pendant mounted luminaires are suspended by rigid metal conduit RMC and a means for flexibility is not. This page is designed to guide you through key points and clear explanations related to the topic at hand. We aim to make your learning experience smooth, insightful, and informative. Dive in and discover the answers you're looking for!
Answer :
In Class II, Division 1 hazardous locations, where pendant-mounted luminaires lack flexibility, the maximum allowable length for rigid metal conduit (RMC) is 18 inches. Therefore, the correct answer is B. 18 inches.
In Class II, Division 1 hazardous locations, where pendant-mounted luminaires are suspended by rigid metal conduit (RMC) and flexibility is not provided, the length of the RMC is regulated to minimize the risk of ignition due to mechanical stress or vibration. According to the National Electrical Code (NEC) Article 501.10(B)(2), the maximum allowable length of the RMC in this scenario is typically limited to 18 inches. This limitation helps ensure that the conduit remains rigid and prevents excessive movement or vibration, which could potentially cause sparking or arcing in the hazardous environment. Therefore, the correct answer is B. 18 inches. Adhering to this requirement is crucial for maintaining safety in hazardous locations where the presence of flammable gases, vapors, or combustible dusts poses a risk of explosion or fire.
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