What is the maximum distance a shutoff valve at the manifold can be located from the appliance when gas is supplied from a remote manifold?

The maximum distance a shutoff valve at the manifold can be located from the appliance when gas is supplied from a remote manifold is established to ensure both safety and efficiency in gas systems. In this case, the correct answer is 50 feet. This distance is recommended because it strikes a balance between accessibility and the need to minimize pressure loss in the gas line.

At distances greater than 50 feet, various safety and operational challenges may arise. For example, longer distances can lead to increased pressure drops and may complicate the maintenance of the system. Additionally, having the shutoff valve too far from the appliance could hinder prompt access in emergencies, which is critical for safety in gas installations.

It's essential to adhere to these guidelines to ensure that the gas system operates effectively while also ensuring the safety of the premises. Proper planning around the placement of shutoff valves is vital to meet industry standards and best practices.