An "underwriter's knot" is a simple knot used primarily in electrical wiring to prevent wires from being pulled out of their terminal connections when tension is applied to the cord, essentially acting as a strain relief mechanism; it's also known as an "electrician's knot" and is named after fire underwriters due to its safety function in reducing the risk of electrical issues caused by loose connections.
Key points about the underwriter's knot:
Purpose: To reduce strain on the screw terminals where wires connect to a socket or plug, preventing them from pulling free when the cord is yanked.
Application: Commonly used in electrical appliances like lamps, hairdryers, and power cords where the wire might experience pulling forces.
How it works: The knot is tied by forming a loop with one wire and then passing the other wire around it, creating a secure hold that distributes tension evenly.
TWO SINGLE CONDUCTOR WIRES
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SPT TYPE WIRE
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