Under what condition would an FDNY permit be required for hot work?

• A. Working with non-flammable materials
• B. Working away from hazards
• C. Use of oxygen and flammable gas
• D. When using hand tools

Answer: (C)

Hot work permits are issued when there is a real risk of ignition from tasks that produce heat, sparks, or flames in an environment that could ignite nearby materials. The scenario with oxygen and a flammable gas creates a highly explosive or very easily ignitable atmosphere, so any hot work could ignite the gas-air mixture. The permit process ensures crucial controls are in place before work begins—isolating or purging the gas, providing proper ventilation, removing combustibles, and establishing a fire watch. That elevated hazard is why a permit is required. The other situations described don’t inherently create the same ignition risk: working with non‑flammable materials, staying away from hazards, or using hand tools generally don’t produce the heat or sparks needed to ignite a flammable atmosphere.