A shutoff valve shall be placed at the immediate connection of each source system to what type of system?

The correct answer is that a shutoff valve should be placed at the immediate connection of each source system to a source system. This is important for ensuring the safe and efficient operation of medical gas systems. The shutoff valve serves a critical role in allowing the maintenance or repair of the source system without disrupting the entire gas supply.

By placing the valve at the connection point, it provides a means to isolate the source, ensuring that gas supply can be efficiently managed while preventing any potential hazards that may arise if the source system needs to be serviced. It is a fundamental safety feature that is standard practice in medical gas installations.

In the context of medical gas regulations and best practices, this positioning of the shutoff valve is a vital part of system design that enables emergency response and minimizes risks associated with gas leaks or system failures.