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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.

Section 7

Page 45

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