Final answer:
A gas appliance regulator is required to control the flow and pressure of gas entering a gas appliance, ensuring safe and efficient operation.
Step-by-step explanation:
A gas appliance regulator is required to be installed when connecting a gas appliance to a gas supply. The regulator is responsible for controlling the flow and pressure of the gas entering the appliance, ensuring safe and efficient operation.
Gas regulators are particularly important when using propane or other gases that come in tanks, like those used with barbeque grills. The gas pressure inside the tank can vary depending on factors such as temperature, so a regulator is needed to reduce and stabilize the pressure before it reaches the appliance.
Gas appliance regulators are designed to meet specific safety standards and regulations to prevent over-pressurization, which could lead to leaks, malfunctions, or even explosions. Therefore, it is essential to follow manufacturers' instructions and local codes that require the installation of regulators when connecting gas appliances.