Chapter:	51C	Title:	GAS SAFETY (INSTALLATION AND USE) REGULATIONS	Gazette Number:	L.N. 290 of 1999
Regulation:	2	Heading:	Interpretation	Version Date:	01/04/2000

In these regulations, unless the context otherwise requires-
"domestic gas appliance" (住宅式氣體用具) means a gas appliance which is designed, or intended, to be used primarily in domestic premises, irrespective of whether it is so used;
"emergency control" (緊急控制閥) means a valve for shutting off the supply of gas in an emergency;
"flue" (煙道) means a passage for conveying the products of combustion from a gas appliance to the external air, and includes any part of the passage in a gas appliance ventilation duct which serves the purpose of a flue;
"flue pipe" (煙道管) means a pipe forming a flue, but does not include a pipe built as a lining into a chimney or a gas appliance ventilation duct;
"gas supply company" (氣體供應公司) means a gas supply company within the meaning of the Gas Safety (Registration of Gas Supply Companies) Regulations (Cap 51 sub. leg. E);
"isolation valve" (切斷閥) means a gas valve which may be used to stop the supply of gas downstream of such valve;
"low pressure" (低壓) means a pressure of not more than 7.5 kPa;
"meter box" (氣體錶箱) means a receptacle or compartment designed and constructed to contain a gas meter and gas fittings used in connection with such meter;
"operating pressure" (操作壓力), in relation to a gas appliance, means the pressure of gas at which it is designed to operate;
"pressure test point" (試壓點) means a gas fitting to which a pressure gauge can be connected;
"shut off" (切斷), in relation to the supply of gas, includes disconnecting the supply of gas and ceasing to supply cylinders; (L.N. 222 of 1999)
"work" (工程) means gas installation work within the meaning of the Gas Safety ( Registration of Gas Installers and Gas Contractors) Regulations (Cap 51 sub. leg. D).