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Greetings. Well, the manufacturer says its not necessary but most folks do. The only issue it can raise is when a maximum of say (4) 12 AWG per wirenut but they twist (4) and it possibly changes the overall OD of the overall conductors and then the wirenut doesn't fit right. Now, if you are soldering joints as I used to like to do to break up the routine, then you must pre-twist prior to soldering so that the solder is not the method relied on mechanically. I kinda ignore the instructions and twist unless the instructions on the package says they must not be twisted otherwise I take it as a recommendation. But the wire nut is optimized to not require pre-twisting but I would be lying if I said I have not done it both ways over my 30+ years.
Thanks for your insight as I am helping my son understand good practice versus being more efficient and profitable in commercial installation
For example....this manufacturer which is the owner of the term wire nut says its not required but acceptable to pre-twist
Thank you, I have had my Journeyman tell me that pre-twisting is the number one rule of terminating and then others tell me it isn't necessary. Glad to get a thorough explanation on it.
You are most welcome. The key is to always check any products listing, even if simply a "wirenut" to ensure its being used per the manufacturer instructions. In the example above, ideal who actually owns the name "wirenut" says its permitted but not required. So mileage will vary with all manufacturers so read those labels.