Which safety rule applies to ignition sources near flammable liquids?

• A. Ignition sources may be placed close for testing
• B. Ignition sources must be at least 50 feet away
• C. Ignition sources must be at least 120 feet away
• D. Ignition sources must be at least 300 feet away

Answer: (B)

Keeping ignition sources away from flammable liquids is about preventing ignition from vapors. The standard rule is to maintain a minimum distance of 50 feet between any ignition source and areas where flammable liquids are present. This buffer reduces the chance that vapors, which can ignite from sparks, flames, or hot surfaces, will reach an ignition source. Distances like 120 or 300 feet aren’t the typical requirement, and placing sources closer than 50 feet increases the risk. Along with the distance, use proper grounding, ventilation, and non-sparking tools as part of a safe setup.