When the gas supply is delivered to a building at 2 psi, an over pressure protection device shall be installed to protect appliances designed to operate at what pressure?

The requirement for installing an over-pressure protection device when the gas supply is delivered at a pressure of 2 psi is critical to ensure that appliances operate safely and effectively. Appliances designed to function at 14 inches of water column (w.c.) or less are typically more sensitive to pressure fluctuations.

When appliances are designed for lower pressure, exceeding this limit can lead to unsafe conditions, potential damage to the appliances, or malfunctioning of systems due to excess pressure. Therefore, the over-pressure protection device serves to prevent the pressure in the gas supply system from exceeding the operating threshold of these appliances.

Options with pressure settings above 14 inches w.c. are designed to handle higher pressures, which would not require the same level of protection against over-pressurization. By focusing on appliances that operate at 14 inches w.c. or less, regulations and standards prioritize safety and appliance integrity, making it essential to install the protective device to guard against pressure levels that could be detrimental to these appliances.