Red Seal Gasfitter — Class B Practice Exam

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In gas safety, what does the acronym "LEL" stand for?

  1. Low Energy Level

  2. Lower Explosive Limit

  3. Leakage Emission Level

  4. Low Environment Limit

The correct answer is: Lower Explosive Limit

The acronym "LEL" stands for Lower Explosive Limit, which refers to the lowest concentration of a gas or vapor in the air that can ignite and cause an explosion when exposed to an ignition source. Understanding LEL is critical for gas fitters, as it allows them to assess the safety of an environment and take appropriate precautions to prevent dangerous situations. Monitoring LEL is essential in various industries to ensure that gas concentrations remain below this threshold, thereby minimizing the risk of fire or explosion. This concept emphasizes the importance of proper gas monitoring and ventilation to maintain workplace safety.

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