1.3.49non-sparking by naturedevice that does not have electrical contacts that move, i.e. “make” or “break” during normal operation, and thus presents a lower risk of ignition of a flammable atmosphereNote 1 to entry: Devices such as plugs, fixed terminals and encapsulated solenoids are considered non-sparking by nature. Devices such as mechanical switches commutating motors, relays and, contactors are considered sparking by nature.1.3.50operating pressuregas pressure that the piping or the appliance is or will be subjected to under normal operating conditions1.3.51outdoor(s)above-ground open-air situation with natural ventilation, without stagnant areas, and where gasleakage and products of combustion are rapidly dispersed by wind and natural convectionNote 1 to entry: Appendix K provides diagrammatical representations of outdoor areas.1.3.52oxygen-depletion sensorODSoxygen depletion devicedevice designed and installed to shut off the gas supply to a gas appliance when the oxygen content of the ambient air is depleted to a specified concentration1.3.53pigtailshort length of small bore copper pipe or a hose assembly (to allow flexibility) used for the high-pressureconnection between an LP Gas cylinder and the cylinder regulator or the cylinder manifold1.3.54pipingsystem of pipes, fittings, components and equipment that conveys gas from a cylinder regulator to the appliance inlet1.3.55POL fittingcommon name for a standard union with left-hand thread, used for connecting to an LP Gas cylinder valveNote 1 to entry: POL fitting is known as a Type 21 connection as defined by AS 2473.2.1.3.56pressurepressure above atmospheric pressure, or gauge pressure1.3.57proprietary systemmanufacturer-specific system using matched components, which may require special tools for installationNote 1 to entry: Proprietary systems may be incompatible with those of other manufacturers and may include piping, flues, and fittings.1.3.58purgepurgingwith respect to piping —(a) replacing the air in piping with gas or inert gas; or