Underwriter's Knot
( Electrician's Knot | Two-strand Wall Knot | ABOK #237 )
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Usage
The Underwriter's Knot is used in electrical applications to reduce strain on the terminal leads of a wire. A hair dryer, for example, will use the Underwriter's knot to protect the wire connections inside. If the hair dryer is accidentally dropped or the cord is pulled, the knot, found just inside the housing, removes the strain from the wires where they attach to the electronics inside.
Common Uses
- protect the wire connections inside a lamp or appliance from pulling loose.
- provide strain relief where an electrical cord enters a plug or housing.
- prevent damage to wiring when a cord is pulled or yanked.
- serve as a stopper inside a lamp to prevent the cord from slipping through the fixture.
- provide strain relief inside a hair dryer or small appliance.
Also known as
- Electrician's Knot
- Two-strand Wall Knot
ABOK
- 237
Structure
The Underwriter's Knot is unique in that it is typically tied in two-strand wire used for electrical purposes. The two wires are typically joined together by an insulated covering that is split down the center leaving two short working ends that are used to form the knot.
