Final answer:
An LP regulator must have a rated capacity equal to or greater than the demand of the appliance it is supplying gas to.
Step-by-step explanation:
In engineering, an LP regulator is a device used to regulate the flow of liquefied petroleum gas (LP gas) from a cylinder to an appliance or equipment. The rated capacity of an LP regulator refers to its maximum flow rate, usually measured in BTU (British Thermal Units) per hour. It is important for the rated capacity of the LP regulator to be equal to or greater than the demand of the appliance it is supplying gas to, to ensure proper functioning.