Quote:
Originally Posted by jimhoward
If your fingers would otherwise be touching the metal screwdriver blade, then it will provide some insulation. It will also prevent the shank of the screwdriver blade from making a short if it hits a live wire.
I am sure you would not intentionally be putting a screwdriver into an appliance with the power on, so this is presumably belt and suspenders in case there is power in a circuit that you did not realize was present and missed in your testing.
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When I can I make sure power off before I stick my fingers and tools in. I alway check it with multimeter for stray voltage. Just added safety precaution.