You may have been a Boy Scout, a Girl Scout, an FFA member, a sailor, or a horse lover, and have probably tied a lot of knots in your day, but it's unlikely that you've ever tied this kind of knot. The Underwriter's knot is a special kind of knot especially designed to keep a light cord from being pulled out of a cord plug. It is the strain relief for the cord on common desk lights and such. So get the wire ready and tie the knot
If you've ever walked by a light fixture sitting on an end table and tripped over the cord, only to pull the cord right out of the plug, you'll understand why this knot is so useful. The knot prevents the cord from being pulled out and acts like a built-in shock absorber. That's the nice thing about an Underwriter's Knot, they hold the connection tight.
Photo: Timothy Thiele