California ICC UST Service Technician Practice Exam

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When monitoring a confined space, which gas level should be monitored?

  1. Upper explosive limit (UEL)

  2. Lower explosive limit (LEL)

  3. Combustible gas limit (CGL)

  4. Flammable gas limit (FGL)

The correct answer is: Lower explosive limit (LEL)

Monitoring the lower explosive limit (LEL) is crucial in confined spaces because it represents the minimum concentration of gas in air that can ignite. When the concentration is at or above the LEL, there is a risk of explosion if an ignition source is present. Therefore, measuring the LEL allows technicians to ensure safety by identifying potentially hazardous conditions before they reach dangerous levels. In confined spaces, where ventilation can be limited and gas accumulation can occur, monitoring for LEL is essential for maintaining a safe working environment. By ensuring that gas levels remain below the LEL, workers can mitigate the risk of fire or explosion, protecting both personnel and property. This focus on the lower explosive limit provides a proactive approach to safety in environments where combustible gases may be present.

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