Which term describes equipment approved for use in flammable atmospheres and must be incapable of releasing enough electrical energy to ignite the atmosphere?

• A. Intrinsically Safe
• B. Hazard
• C. Line Personnel
• D. Mitigate

Answer: (A)

The concept tested is intrinsically safe design. Intrinsically safe equipment is specifically approved for use in flammable atmospheres because it is designed to be incapable of releasing enough electrical energy to ignite the atmosphere, even under fault conditions. This is achieved by limiting the energy, current, and voltage that the equipment can generate or release, and by using protective barriers and energy-limiting components so that a fault or short circuit cannot produce a hazardous spark or hot surface.

So, the correct term describes equipment that is certified to operate safely in hazardous locations by keeping electrical energy well below ignition thresholds. The other terms don’t describe equipment types meant for hazardous atmospheres: hazard is a general danger, line personnel refers to people, and mitigate is an action to reduce risk rather than a description of equipment.