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IGNITION SOURCES <br />Common Sources <br />• Vehicles, motors <br />• Power tools <br />• Radios, phones, cell phones <br />• Doorbells, light switches <br />• Flashlights <br />• Automatic timers (e.g., exterior lights) <br />• Static electricity <br />Natural Gas Explosive Range <br />Ignition temperature: 9900 F — 11000 F <br />Mercaptan is perceptible at about 10% of LEL <br />EXPLOSIVE <br />RANGE <br />EXPLOSION <br />LEL POSSIBLE UEL <br />(LOWER EXPLOSIVE LIMIT) (UPPER EXPLOSIVE LIMIT) <br />ODOR <br />PERCEPTIBLE <br />9 GAS <br />