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Knot List: Underwriter's Knot (Electrician's Knot) ‐ Step-by-Step

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Underwriter's Knot (Electrician's Knot), Showing Name
Underwriter's Knot (Electrician's Knot), Step-by-Step Animation
 

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Underwriter's (Electrician's) Knot Tying

Form a loop using the first wire. With the second wire, form a loop around the first and pass the tail through its loop. Attach the wires to their terminals. Strain on the cable is now taken by the knot.
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Underwriter's (Electrician's) Knot Details

Origin: This knot was described by Ashley as a Wall Knot of two strands which he recommended for electricians expecting rough treatment (ABOK # 237, p 44.) It is known as the Underwriter's Knot – presumably because fire underwriters know that the strain relief reduces the risk of fires and electrocution.

Tying it: The two strands wrap around each so that each strand exits the knot away from the standing end. This is the same technique employed when tying a Wall Knot.

Strain Relief: When finished and installed, the knot should be snug against the housing and both terminal leads should have a little slack. Then, strain on the line is taken by the knot and does not affect the connections.

Disclaimer: Any activity that involves ropes is potentially hazardous. Lives may be at risk - possibly your own. Considerable attention and effort have been made to ensure that these descriptions are accurate. However, many critical factors cannot be controlled, including: the choice of materials; the age, size, and condition of ropes; and the accuracy with which these descriptions have been followed. No responsibility is accepted for incidents arising from the use of this material.

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