No worker shall undertake any servicing or maintenance of a vehicle while a flammable liquid or gas or an explosive substance is loaded into or unloaded from the vehicle or is present in the vehicle in any place other than the fuel tank.
- Any driver who operates a vehicle that contains a flammable liquid or gas or an explosive substance shall ensure that the engine of the vehicle is shut off during the connection or disconnection of the lines for the loading or unloading of the flammable liquid, gas or explosive substance.
- All internal combustion engines in a hazardous location shall have combustion air intakes and exhaust discharges that are equipped with a flame arresting device or they will be located outside the hazardous location. Whenever possible, internal combustion engines should be located outside the hazardous location.
- All diesel engines to be used with in hazardous locations shall be equipped with positive air intake shutoff valves.
