9. Why should an electrical worker determine the nominal voltage of a circuit first before making contact with the circuit?

So the worker can select the proper PPE and voltage tester to use before contact with the circuit is made
So the worker can select the proper PPE to use before contact with the circuit is made
So the worker can select the proper voltage tester to use before contact with the circuit is made
As long as the circuit is properly tagged/locked out, no determination of the nominal voltage is necessary

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