Electronics > Beginners
Prevent cable from being pulled through hole
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Mr. Scram:

--- Quote from: jpanhalt on May 14, 2018, 10:26:52 am ---I have just used a zip tie (nylon strap).   You can also wrap tape around it, use heat shrink, or any combination of the three.

--- End quote ---
Even Weller uses zip ties this way in their higher end stuff. If it works, I guess.
Richard Crowley:

--- Quote from: Gyro on May 14, 2018, 10:22:41 am ---Nobody asked if it was a mains cable?  ???  If it is, then no way should you ever tie a knot in it! Mains cables require proper strain relief to prevent tugging or chafing on the sides of the hole. That's a safety issue. [Edit: Another vital function of a strain relief is rotation prevention - that can tear internal mains wiring loose.]

--- End quote ---
Yes that seems like common sense here in the 21st century.  But back 60-80 years ago, rubber grommets and special knots were quite common with attached zip-cord power entrances.  I remember seeing the special knots where you zip apart the two wires (L & N) and tie a symmetrical knot.  Look at some of those videos showing vintage electronic gear.

I hate attached power cords (including wall-warts and line-lumps).  I take special pleasure in replacing those old crumbly grommets (and even Heyco bushings) with proper IEC 60320 panel-mount connectors. I still have a nice big bag of IEC connectors that I bought at the Tektronix surplus sales.

Gyro:
Me too. You can almost guarantee, the more valuable or irreplaceable the 'treasure' you're carrying, the more likely the cord is to get wrapped around your ankles!
bd139:
Captive leads of any kind are evil.

I watched my father stand on an old radio power supply lead when he was carrying it once. Faceplanted and cracked a rib.

Yes I did laugh  >:D
Kjelt:
Yes also often put a knot in it or used a tiewrap,
it prevents the cable from being pulled out but it does not prevent the cable from being pushed in  :)

Also in dusty environments those holes are dustcollectors.
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