What material is required to be placed between metal deck plating and equipment when working on energized equipment?

The correct choice is rubber matting, as it serves a crucial role in electrical safety when working on energized equipment. Rubber is a non-conductive material, which means it does not allow electricity to pass through it. This property is vital in preventing accidental electrocution or electrical shorts, especially when technicians are working in close proximity to live electrical circuits or equipment.

Using rubber matting creates a safe barrier between the metal deck plating, which is conductive, and the worker or equipment. By standing or working on rubber, the risk of electrical shock is significantly reduced. Additionally, rubber matting is durable, provides some cushioning, and can help with grip, further enhancing safety in a potentially hazardous environment.

Plastic sheeting, wooden planks, and cardboard do not have the necessary insulating properties required to safely separate energized components from workers or other conductive surfaces.