Just as Joe had never heard of twin entry wire ferrules, I also had no experience with them and I am a retired inside wireman.
As usual the Internet and YouTube comes through to provide why we Yanks have never heard of them. These are quite common (generally required) in Europe and in Asia, but USA manufacturing requirements do not require their use on our products.
Here is a link to a YouTube video that makes things much clearer.
https://youtu.be/os66cID30Ek
Larry
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