After a punctured or damaged EV battery, how far should the vehicle be isolated from flammable materials?

• A. 20 feet
• B. 50 feet
• C. 75 feet
• D. 150 feet

Answer: (B)

When a punctured or damaged EV battery is involved, creating a safety buffer around the vehicle is essential because lithium-ion cells can undergo thermal runaway, vent flammable vapors, and potentially ignite if exposed to heat, sparks, or flames. Maintaining a minimum distance helps protect people and nearby property, and also gives responders space to work, assess the scene, and apply cooling or suppression as needed. The recommended exclusion distance is fifty feet. This distance reduces the risk from radiant heat and any possible venting, while still allowing efficient operation of emergency actions. Distances shorter than that increase exposure to heat and ignition risk, while much larger distances, though safer, can hamper response effectiveness. Fifty feet offers a practical safety balance for typical incidents.