When would a worker typically need to use a full body harness?

A full body harness is specifically designed to provide safety and support for workers who are exposed to fall hazards while working at heights. This type of harness secures the worker's body to a lanyard and anchor point, effectively minimizing the risk of injury should a fall occur.

In situations where workers are at elevations—such as on scaffolding, ladders, rooftops, or elevated platforms—the harness ensures that they remain secured and can prevent them from falling to lower levels. This is critical in various industries like construction, maintenance, and any job that involves working above ground level.

The other scenarios mentioned—operating machinery, working near open flames, and handling chemicals—involve different risks that may require different types of personal protective equipment (PPE) but do not specifically necessitate a full body harness. For instance, operating machinery may focus more on hand and eye protection, while handling chemicals would require gloves and goggles. Therefore, the correct application of a full body harness is pertinent during work conducted at heights to safeguard against falls.