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service) rather than cords marked “SJ” (junior hard service). Make sure the grounding prong is intact. In damp locations, make sure wires and connectors are waterproof and approved for such locations. Do not create a tripping hazard.

Check power cords and extensions—Electrical cords should be inspected regularly using the following procedure:

  • 1.

    Remove the cord from the electrical power source before inspecting.

  • 2.

    Make sure the grounding prong is present in the plug.

  • 3.

    Make sure the plug and receptacle are not damaged.

  • 4.

    Wipe the cord clean with a diluted detergent and examine for cuts, breaks, abrasions, and defects in the insulation.

  • 5.

    Coil or hang the cord for storage. Do not use any other methods. Coiling or hanging is the best way to avoid tight kinks, cuts, and scrapes that can damage insulation or conductors.

You should also test electrical cords regularly for ground continuity using a continuity tester as follows:

  • 1.

    Connect one lead of the tester to the ground prong at one end of the cord.

  • 2.

    Connect the second lead to the ground wire hole at the other end of the cord.

3. If the tester lights up or beeps (depending on design), the cord’s ground wire is okay. If not, the cord is damaged and should not be used.

Do not pull on cords—Always disconnect a cord by the plug.

Use correct connectors—Use electrical plugs and receptacles that are right for your current and voltage needs. Connectors are designed for specific currents and voltages so that only matching plugs and receptacles will fit together. This safeguard prevents a piece of equipment, a cord, and a power source with different voltage and current requirements from being plugged together. Standard configurations for plugs and receptacles have been established by the National Electric Manufacturers Association (NEMA).

Section 8

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