The Underwriter’s Knot is a stopper knot used in electrical wiring.
Its main job is to prevent the wires from being pulled out of electrical terminals.
It works as a strain relief by taking all the strain and keeping the pressure off the terminals.
In the Ashley Books of Knots, it’s mentioned that “I can recommend it unhesitantly to electricians in general for employment where rough treatment is expected.”
Let’s learn it in detail.
Underwriter’s Knot Details
Type: Stopper Knots
Other Names: Electrician’s Knot, Two strand Wall Knot
ABoK Reference: #237
Quick Guide
To tie the Underwriter’s Knot, start by twisting the wire around one another three times. Then, bend the wire back on itself to make a loop. Now, pass the working end of another wire under the first wire and through the loop on the first wire.
Finally, pull both ends to tighten the knot and then attach the wire to the terminals.
How to Tie the Underwriter’s Knot Step by Step
- Form a Loop with the RED wire.
- Bring the BLACK wire down.
- Feed it through the RED loop.
- Pull both ends to tighten the knot.
- Attach the wires to their terminals.
Application and Uses
The Underwriter’s Knot is used in lamps and electrical plugs.
It prevents wires from pulling free when they pass through the holes by reducing strain on the terminal connection where the wire is screwed with the metal.
So, even if someone trips on the cord too hard, the knot takes the strain—no the metal connections.
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