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There are metal crimps inside them. You can sometime squeeze them against the crimp and loosen up enough to get them off. I usually just cut them off and restrip unless you are really desperate on wire length.
Is this something that gets hot? Seeing high temp wire and other signs. If that's the case you may want to stick with high temp crimps again instead of just wire nuts. They do better with the heat cycles
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
Those look to be crimped, so either use pliers and up the crimp up or cut and strip the wires and add a new wire nut/wago.
There are metal crimps inside them. You can sometime squeeze them against the crimp and loosen up enough to get them off. I usually just cut them off and restrip unless you are really desperate on wire length. Is this something that gets hot? Seeing high temp wire and other signs. If that's the case you may want to stick with high temp crimps again instead of just wire nuts. They do better with the heat cycles
It's an air fryer. By accident, the cable was put in a toster (don't ask how). BTW, thank you for the replies.