What safety equipment should be worn when working on live circuits?

When working on live circuits, the primary concern is to protect oneself from electrical hazards, which can result in severe injuries or even fatalities. Insulated gloves are specifically designed to prevent electrical currents from passing through the body, providing a critical layer of safety by ensuring that any accidental contact with live components does not lead to electrical shock.

Safety goggles are also essential, as they protect the eyes from potential hazards such as sparks, flying debris, or other materials that could result from working on or near energized equipment. This combination of insulated gloves and safety goggles addresses both electrical and physical safety risks effectively, making it the appropriate choice for working on live circuits.

The other options, while they include some safety measures, do not directly address the crucial need for protection from electrical hazards. Metal gloves could increase the risk of shock by providing a conductive path, while hard hats and ear protection primarily protect against different types of hazards, such as falling objects or noise, and do not specifically pertain to electrical work. Respirators and isolation equipment may have their place in certain environments but are not focused on the immediate electrical risks associated with live circuits.