The 3/8 inch pigtail length refers to the minimum length of what feature?

• A. Wire Insulation
• B. Square Knot Pigtails
• C. Cable Shielding
• D. Wire Group Egress

Answer: (B)

When you secure conductors with a pigtail, the length of that short tail matters. The 3/8 inch pigtail length refers to how long the end of the wire left to form the knot (the square knot pigtail) must be. This minimum gives enough material to wrap and complete the knot securely and to provide some strain relief, so the knot won’t loosen and the insulation isn’t stressed or damaged as the wire flexes or vibrates. If the tail were shorter, the knot could fail or slip; if longer, it’s simply extra length without changing the fundamental requirement. This guideline specifically applies to the length of the pigtail used to form the square knot, not to insulation length, shielding, or the way wires leave a bundle.