Quote Originally Posted by big john View Post
I don't think 70E does explicitely state what you're looking for.

But 130.2 says that parts shall be put in an electrically safe condition before working on or otherwise interacting with them.

The action of "working on" includes the voltage check needed in 120.1 to verify a safe condition, so you would need PPE until you demonstrate you don't.
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And that doesn't mean that the power is off. That means that the power is off, the means of disconnect locked, and idiot proof! Random empoyees can, will, and do energize circuits with the electrician working on things right next to them! If you are working on an outlet you will get a good shock. If you are working on a large sign ballast you may not be here tomorrow. Make sure no one has access to the means of disconnect.