Whenever recharging with carbide always replenish the water-supply.
Never deposit residuum or exhausted material from water-feed machines in sewer-pipes or near inflammable material.
Always keep water-tanks and water-seals filled with clean water.
Never test the generator or piping for leaks with a flame, and never apply flame to an outlet from which the burner has been removed.
Never use a lighted match, lamp, candle, lantern or any open light near the machine.
Failure to observe the above cautions is as liable to endanger life as property.
9. OUTSIDE GENERATOR HOUSES.--(a) Outside generator houses should not be located within 5 feet of any opening into, nor shall they open toward any adjacent building, and must be kept under lock and key.
(b) The dimensions must be no greater than the apparatus requires to allow convenient room for recharging and inspection of parts. The floor must be at least 12 inches above grade and the entire structure thoroughly weather-proof.
(c) Generator houses must be thoroughly ventilated, and any artificial heating necessary to prevent freezing shall be done by steam or hot-water systems.
(d) Generator houses must not be used for the storage of calcium carbide except in accordance with the rules relating to that subject (vide Chapter II.).