Editing Wire wrap (section)

== Method ==
[[file:Manual wire wrap tool and wire wrap wire in various colours.jpg|thumb|left|Manual wire wrapping/stripping tool]]

A correctly made wire-wrap connection for 30 or 28 [[AWG]] wire is seven turns (fewer for larger wire) of bare wire with half to one and a half turns of insulated wire at the bottom for strain relief.<ref name="NASA Workmanship standards for Discrete Wiring">{{Citation| url = http://workmanship.nasa.gov/lib/insp/2%20books/links/sections/301_Discrete%20Wiring.html| publisher = NASA| place = USA| title = Workmanship| contribution = Standards for Discrete Wiring| date = 2000-03-31| access-date = 2011-08-21}}</ref><ref name="MIL-STD-1130B">{{cite web|author=Department of Defense|title=Military Standard: Connections, Electrical, Solderless Wrapped|date=1978-12-12|url=http://everyspec.com/MIL-STD/MIL-STD-1100-1299/MIL-STD-1130B_22383/|format=pdf|df=dmy|access-date=2016-11-04|at=sec. 5.3.2}}</ref>  The square hard-gold-plated post thus forms 28 redundant contacts.  The silver-plated wire coating cold-welds to the gold.  If corrosion occurs, it occurs on the outside of the wire, not on the gas-tight contact where oxygen cannot penetrate to form oxides.  A correctly designed wire-wrap tool applies up to twenty tons of force per square inch on each joint.

The electronic parts sometimes plug into [[Jack (connector)|sockets]]. The sockets are attached with [[cyanoacrylate]] (or [[silicone]] adhesive) to thin plates of glass-fiber-reinforced [[epoxy]] ([[fiberglass]]).

The sockets have square posts. The usual posts are {{convert|0.025|in|mm|abbr=on}} square, {{convert|1|in|mm|abbr=on|1}} high, and spaced at {{convert|0.1|in|mm|abbr=on|2}} intervals. Premium posts are hard-drawn [[beryllium copper]] alloy plated with a {{convert|0.000025|in|nm|abbr=on}} of gold to prevent corrosion. Less-expensive posts are [[bronze]] with [[tin]] plating.

30 [[American wire gauge|gauge]] (~0.0509mm<sup>2</sup>) [[silver]]-plated soft [[copper]] wire is insulated with a [[fluorocarbon]] that does not emit dangerous gases when heated. The most common insulation is "[[Kynar]]". The 30 [[American wire gauge|AWG]] Kynar wire is cut into standard lengths, then one inch of insulation is removed on each end.

There are three ways of placing wires on a board. In professionally built wire-wrap boards, long wires are placed first so that shorter wires mechanically secure the long wires. Also, to make an assembly more repairable, wires are applied in layers. The ends of each wire are always at the same height on the post, so that at most three wires need to be replaced to replace a wire. Also, to make the layers easier to see, they are made with different colors of insulation. In space-rated or airworthy wire-wrap assemblies, the wires are boxed, and may be conformally coated with wax to reduce vibration.  Epoxy is never used for the coating because it makes an assembly unrepairable.{{citation needed|date=June 2022}}