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- Indoor extension cords come in two-wire cords in lengths from 6' to 15'. White and brown are the basic colors.
- Outdoor extension cords are used for outdoor power tools and exterior lighting. They come in 16/3, 14/3 and 12/3 wire, and the most common lengths are from 25' to 100'. Heavy-duty extension cords should be used with high-wattage appliances.
- Any UL-listed cord will carry a UL label near the female end. Many companies are now using an alternative method of labeling allowed by UL, which permits the UL markings to be molded into the cord ends. This ensures a permanent marking that cannot be provided with a label. It is important to check for this UL insignia, whether it is a label or a permanent marking. Non-listed cords can be similar in appearance to listed ones.
- To be UL-listed for outdoor use, three-wire round cords must have connector and cap molded to the cord and a lip on the end of the connector to prevent misuse. Beginning in 1998, UL-listed outdoor cords began appearing with the “SJTW” marking on the cord, not “SJTW-A” as was previously used. For a period of time, either marking will be acceptable for outdoor use.
- Grounding cords are available in both heavyweight and heavy-duty construction differing from standard cords, because they have three conductors instead of two and are equipped with a three-prong grounding plug and connector.
- Step-saver cords have built-in pendant switches to control appliances and lamps across the room.
- Wind-up reels keep tangled, foot-catching cords off the floor.
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