R 408.41861 Ignition hazards.

Rule 1861. (1) Internal combustion engine powered equipment shall be so located that the exhaust piping is at a distance away from flammable and combustible materials to prevent ignition. When the exhaust is piped to outside the building under construction, a clearance of not less than 6 inches shall be maintained between the piping and flammable and combustible material. (2) Smoking shall be prohibited within 25 feet of flammable material. The area shall be posted with a sign "No Smoking or Open Flame." The sign shall be as prescribed in the Construction Safety Standard Part 22 “Signals, Signs, Tags and Barricades,” as referenced in R 408.41802. (3) Electrical wiring equipment and portable battery-powered lighting equipment used in connection with the storage, handling, or use of flammable material shall be of the type approved for the hazardous location. (4) The nozzle of an air, inert gas, and steam line or hose, when used in the cleaning or ventilation of tanks and vessels that contain flammable gases or vapors, shall be bonded to the tank or vessel shell. (5) When a hazardous concentration of flammable gas or vapor exists in the area outside of the tank or vessel, the external bonding connection shall be made to the tank or vessel with the non-sparking device. The final bonding connection shall be made outside the hazardous concentration.