No markings are required on wires shorter than what length?

No markings are required on wires shorter than what length?

• A. 1 inch
• B. 2 inches
• C. 4 inches
• D. 3 inches

Answer: (D)

Wiring identification markings exist to help identify circuits, but very short leads don’t leave enough room to apply a legible mark without interfering with terminals or connectors. The practical threshold is three inches: any wire shorter than three inches doesn’t require markings because there isn’t space to read or maintain the marking after installation. Wires three inches or longer are long enough to accommodate a readable identification near the connection or within the harness, so they must be marked.

Wiring identification markings exist to help identify circuits, but very short leads don’t leave enough room to apply a legible mark without interfering with terminals or connectors. The practical threshold is three inches: any wire shorter than three inches doesn’t require markings because there isn’t space to read or maintain the marking after installation. Wires three inches or longer are long enough to accommodate a readable identification near the connection or within the harness, so they must be marked.