Difference between Regular and Modified Wrap

[shawn_adams]

When looking at wire wrap tools such as the WSU-30 and WSU-30M from Jonard Tools, the only difference noted in the datasheet (seen below) is that WSU-30 is regular and WSU-30M is modified.

Jonard had this to say about regular versus modified wrapping:

A standard wrap is generally used tor 18 AWG and larger diameter wires: a modified wrap is typically used for 26 AWG and smaller wires, and is used almost exclusively for 28 to 30 AWG wires, In either case, the wrap style affects only the connection’s mechanical stability; both styles provide suitable electrical connections.

and

A ‘Regular’ bit wraps the bare wire around the terminal. A ‘Modified’ bit wraps a portion of insulation around the terminal in addition to the bare wire. This greatly increases the ability to withstand vibration.

For more information about wire wrapping and instructions to do so, please see the brief below from Jonard Tools.

Jonard Tools Wire Wrap Overview.pdf

[APDahlen]

This is an example of a modified wire wrap

Additional information about the technique is located in this article. It provides justification for wire wrap as a prototyping method.

Use Wire Wrap Techniques for Secure Wire to PCB Connections

What is wire wrap? The wire wrap technique and tools facilitate semipermanent electrical connections for low current applications. As shown in Figure 1, small gauge wire is wrapped around square posts such as the 0.1 in pitch headers attached to this used Arduino PORTENTA Pro breakout board. The result is a fast heat- and chemical-free joint with good mechanical stability on par with a soldered joint. The square pin is an important stipulation for the wire wrap technique as it ensures a solid o…