Do you need an arc flash label for equipment that is powered by a 480v drop cord?

I often check these just to understand the hazard. This connection would be best represented by an HCB orientation. Many times I find these plugs energized in their normal state. The plug then is considered a movable conductor so the approach boundary increases. I have found a somewhat elevated arc flash hazard at plugs which is not ideal. When personnel then make/break this connection while the plug is energized their hands are directly on each end and the connection is likely near their body, possibly face. An arcing fault in this situation would not be good.

I am a fan of keeping these de-energized. Once the connection is made or broken, the upstream disconnect switch can more safely be used to energize the circuit.