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For 6mm it is better to use an uninsulated crimp with a hex crimper than those plastic jobbies.
Anything above 2.5mm I'd use an uninsulated ferrule or lug with an indent crimper or if it's a larger size like 16mm or above a hex type crimper then use heat shrink to finish. I'm not a big fan of insulated lugs TBH, they're not very consistent and they're not visually checkable in the same way an uninsulated crimp is.
Why do you feel it is a better crimp when uninsulated (crimping tool is making direct contact with metal rather than PVC?)? Also, why a Hex crimping tool when the conductors get larger? Is this from experience or just known better practise?
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