G2 Gas Fitter Practice Exam

What is a system regulator?

1. A pressure regulator upstream of the appliance regulator

2. A device located at the appliance itself

3. A regulator that only functions under high pressure

4. A component that is part of the gas meter

The correct answer is: A pressure regulator upstream of the appliance regulator

A system regulator plays a vital role in managing gas pressure before it reaches appliances. Specifically, it is designed to reduce the pressure of gas from the supply line to a level that is appropriate for safe operation of the downstream appliances. By being positioned upstream of the appliance regulator, it ensures that the gas entering the system is at a consistent and controlled pressure, which is crucial for the stable and efficient functioning of gas appliances. This upstream regulation is essential for protecting appliances from pressure fluctuations that can occur in the main supply, thereby enhancing safety and performance. While other devices may serve different functions or be located at other points in the system, the definition of a system regulator as one that specifically acts before the appliance regulator accurately reflects its place in the gas distribution chain. The other options describe different types of regulators or components: a device located at the appliance itself refers to the appliance regulator, which further reduces the pressure for safe appliance operation; a regulator that only functions under high pressure does not capture the full function of a system regulator, which can operate in varied pressure situations; and a component that is part of the gas meter describes a different aspect of gas regulation entirely, primarily concerning metering rather than pressure control.