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Answer :
Final answer:
When Type PVC conduit is used for the underground wiring of gasoline dispensing pumps, the last 10 feet of the conduit run must be upgraded to Type RMC or Type IMC threaded conduit for enhanced protection.
Explanation:
When Type PVC conduit is used for underground wiring of gasoline dispensing pumps, the last portion of the underground run must adhere to specific safety and construction standards to prevent hazardous situations. It is essential to switch from PVC to a more robust conduit type capable of withstanding potential damages near the surface. The correct answer to the question is B) 10 feet, meaning the last 10 feet of the underground run shall be Type RMC or Type IMC threaded conduit. This requirement ensures a higher level of protection in areas that might be more susceptible to damage or where additional mechanical protection is deemed necessary. These types of conduit provide the durability and protection required for such critical installations, reflecting best practices in the installation of electrical systems in potentially hazardous environments.
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