Picture of Use a Barrel Knot When You're Out Of Zip Ties
It happens to everyone. You thought you had a stash of zip ties (cable ties, tie wraps, whatever) in your tool bag and you just found out your all out. Sometimes you have to secure cables in a plenum environment but you don't have the plenum rated zip ties. The barrel knot will fill in nicely and you can use wire or string to tie it.

The barrel knot is the old school zip tie. This was taught to me by a Marine who had learned it by reading a WWII era field manual on cabling.
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Step 1: Choose the material for the knot

Picture of Choose the material for the knot
You want to use something strong with a relatively small diameter. The wire inside a cat5e or cat6 cable will work great. You'll want to straighten it out as much as possible.

Here I am using 24 gauge cross connect wire. You can buy a roll of it here

Step 2: Prep the wire

Picture of Prep the wire
Straighten out the wire as much as possible. Then make a "u" with the wire. The length of the "u" will determine the length of the knot.

Step 3: Begin Wrapping The Cables

Picture of Begin Wrapping The Cables
Lay the "U" parallel with your cables and begin wrapping the extra wire as neatly as possible around the cables. You will want to keep this as tight (for strength) and as neat (so you can take pride in your work) as possible. 

Step 4: Insert the wire through the loop

Picture of Insert the wire through the loop
Now insert the wire through the loop.

Step 5: Pull the loop through

Picture of Pull the loop through
Now pull the loop under the wraps. At this point your knot is as good as done. But if you want to go pro. Follow the next step.

Step 6: Bonus Points: Tie off the wire

Picture of Bonus Points: Tie off the wire
For bonus strength points, tie off the wire with a good twist. That cable is not going anywhere.

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Okay. Great... I see a length of wire. What's it's total length? Is it a cut section to be incorporated into the wrap or, just the first section >>> the lead of the wrap wire around the bundling?
johnpoole4 years ago
anyone other then myself remember 12 twine and a double chicago stitch..
Yup, cable lacing is almost a lost art, but is actually seeing a resurgence amongst many companies. I learned how from an senior telephone tech and use it whenever the opportunity presents itself...
Would either of you be interested in making an 'ible on it? I'm fascinated by ropework/knots, as are many other makers. A quick google search only turned up this page :-/
thoraxe3 years ago
Very nice, this seems like it can be used with regular twine as well.
spacesaver4 years ago
This is very similar to the way wire bundles in aircraft used to be fastened together. While restoring a WWII aircraft my boss at the time did all the wiring like this; for gearheads it truly was close to artwork.
CaseyCase4 years ago
A "packer's knot" works very well for this as well.
PKM4 years ago
This, to me, looks related to the art of whipping- tying a thin thread around the end of a thick rope to stop it fraying or unbundling.  You can find more techniques of this type by Googling for "whipping rope".  Certainly useful to know that this one works with wire, though.