What term means any operation that uses tools or machines that may produce a source of ignition?

• A. Hot Work
• B. Plenum
• C. Explosion
• D. Gravity System

Answer: (A)

Hot work is any operation that uses tools or machines capable of producing heat, sparks, or an open flame that could ignite flammable materials. This includes activities like welding, cutting, grinding, brazing, and soldering. Because these tasks can create ignition sources, they’re typically controlled with safety measures such as hot-work permits, fire watches, and appropriate fire protection equipment. The other terms don’t describe a process that inherently generates ignition sources: a plenum is an air distribution duct, an explosion is a destructive event, and a gravity system refers to a type of system not defined by ignition-producing activity.