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When can a certified hose be used to connect a construction heater to temporary piping?

  1. Only if a lever handle shut off valve is installed upstream of the hose

  2. Only if the hose is 15 feet long

  3. Never

The correct answer is: Only if a lever handle shut off valve is installed upstream of the hose

A certified hose can be used to connect a construction heater to temporary piping when a lever handle shut-off valve is installed upstream of the hose. This safety requirement ensures that there is a reliable means to quickly shut off the gas flow in case of an emergency or when the heater is not in use. The lever handle is preferred because it provides a clear visual indication of whether the valve is open or closed, enhancing safety for workers on a construction site. The other options do not meet the necessary criteria for safe installation. The length of the hose, for example, is not specified as a standard requirement; rather, proper shut-off mechanisms and certifications are essential for safe gas operations. Additionally, stating that a certified hose can never be used does not align with safety regulations that allow for its use under specific conditions, such as the installation of a properly placed shut-off valve.