What constitutes adequate insulation?

• A. Rubber gloves and sleeves
• B. Safety glasses
• C. Steel-toed boots
• D. Insulated tools

Answer: (A)

Adequate insulation means providing a dielectric barrier that stops electrical current from reaching the body when working with energized equipment. Rubber insulating gloves and sleeves are designed for this purpose—they are rated for specific voltage classes and are used to cover the skin and hands, creating the primary protection against electric shock. When they’re in good condition, properly rated for the task, and used with the appropriate cuff coverage, they prevent current from passing through to the worker.

Safety glasses shield eyes from debris and heat but do not block electrical current, so they don’t meet the insulation requirement. Steel-toed boots protect feet from crush hazards and do not offer reliable electrical insulation. Insulated tools help reduce the path current can take through a tool, but they don’t provide the skin’s dielectric barrier by themselves; gloves are the fundamental insulation, with insulated tools as a supplementary measure.