The grounding path for extension cords must be kept intact to keep you safe. A typical extension cord grounding system has four components:
❚ Make sure the path to ground is continuous.
❑ a third wire in the cord, called a ground wire;
❑ a three-prong plug with a grounding prong on one end of the cord;
❑ a three-wire, grounding-type receptacle at the other end of the cord; and
❑ a properly grounded outlet.
Control hazards of exposed live electrical parts: isolate energized components
Outlets must be grounded properly.
Electrical hazards exist when wires or other electrical parts are exposed. These hazards need to be controlled to create a safe work environment. Isolation of energized electrical parts makes them inac- cessible unless tools and special effort are used. Isolation can be accomplished by placing the energized parts at least 8 feet high and out of reach, or by guarding. Guarding is a type of isolation that uses various structures—like cabinets, boxes, screens, barriers, covers, and partitions—to close-off live electrical parts.
❚ guarding—a covering or barrier that separates you from live electrical parts
This exposed electrical equipment is guarded by an 8-foot fence.
Use covers to prevent accidental contact with electrical circuits.