Underwriter's knot
The underwriter's knot is used in electrical wiring as strain relief to prevent a cable from being pulled from electrical terminals when the cable is yanked.[1]
| Underwriter's knot | |
|---|---|
 | |
| Names | Underwriter's knot, Two-strand wall knot |
| Category | Stopper |
| Related | wall knot, crown knot |
| Typical use | electrical |
| ABoK | #237, #775 |
History
Clifford Ashley listed it as an electrician's knot in 1944. He suggested it be used "where rough treatment is expected" and described it as a two-strand wall knot.[2]
The name may come from its use by fire underwriters, who understood its importance in electrocution and fire prevention.[3]
Function
The knot is typically used for tying lamp or appliance cords where they join the plug or socket. Its purpose is to order to "reduce strain on the screw terminal connections—where the metal parts of the wires connect to the socket or plug—and prevent the wires from pulling free."[4]
See also
References
- "Underwriter's Knot Strain Reliefs - What is an Underwriter's Knot - Strain Reliefs". electrical.about.com. Retrieved 2014-01-26.
- Ashley, Clifford W. (1944), The Ashley Book of Knots, New York: Doubleday, p. 44
- "Underwriter's (Electrician's) Knot | 101Knots". www.101knots.com. Retrieved 2020-03-31.
- "This Is How to Tie an Underwriter's Knot for Lamp Sockets". The Spruce. Retrieved 2020-03-31.
External links
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.