Insulation Stripped back too far.need narrative. - Electrical

Looking for a narrative explaining why the insulation on the main service conductors shouldn’t be stripped back too far.

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cdnassets.hw.net/dims4/GG/2a3f9dd/2147483647/resiz

Old Electrical Wiring History of Types in buildings

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Is this an acceptable amount of exposed wire? : r/electrical

Why do you need to strip at least 1 cm of insulation from both ends of a jumper wire? - Quora