NFPA 58 requires that there be no ignition sources:

• A. Within 25ft of a propane transfer location
• B. Within 10ft of a propane transfer location
• C. Within 5ft of a propane transfer location
• D. Within 50ft of a propane transfer location

Answer: (A)

NFPA 58 sets a safety zone around propane transfer locations because propane vapors can escape during transfers and are easily ignited by flames, sparks, or hot surfaces. Vapors tend to travel along the ground and can accumulate if ignition sources are nearby, so keeping them out to a distance of 25 feet significantly reduces the chance of a flash fire or explosion if a release occurs. This means no open flames, smoking, sparks from welding or grinding, or hot equipment within that area, and it emphasizes proper grounding and bonding to prevent static discharge during transfers. The 25-foot distance is the standard protection measure here, not the other distances listed.