Which requirement must be fulfilled before placing appliances and equipment into operation?

Before placing appliances and equipment into operation, conducting a leak check of the piping system is essential to ensure safety and proper functioning. This requirement is fundamental because a leak in the piping system can lead to hazardous situations, including fires or gas exposure. Ensuring that there are no leaks protects both users and the environment and is crucial in preventing potential accidents related to gas or other hazardous materials.

While verifying fuel type, installing exhaust systems, and conducting user training are all important components of a safe operational setup, ensuring that the piping system is leak-free is a primary safety measure that must be taken before anything else. It directly addresses one of the most critical aspects of appliance operation: preventing leaks that could create dangerous conditions. Therefore, the leak check is a vital step in the preparation process for a safe and efficient operation.