Code 7502 applies to employers engaged in operating gas companies involving local distribution of natural gas by means of gas mains or piping to their customers.  This classification is also applicable to employers engaged in the local distribution of liquified petroleum gas (LPG) and gas companies that produce and distribute artificial gas.  LPG is also distributed to customers through gas mains or pipelines and is stored in central tanks.  Gas companies that produce artificial gas use LPG as an operator, equipment maintenance, installation and repair, and gas main connection and construction employees, etc. are inclusive under this classification, provided that such work is performed in connection with the gas company operation. 

Gas companies will also handle emergency problems for customers in which repair technicians will be dispatched to a particular location.  Since natural gas is colorless and odorless, gas companies will add an odorant to the gas so that customers can smell the gas and detect whether or not they have a leak or suspect a leak.  Gas leaks can occur on outdoor gas lines or on indoor lines when the lines are damaged.  Technicians may install and/or repair gas meters, appliances or gas regulators connected to piping in a residence.