One minor issue with the above. NFPA 70E is not codified in most jurisdictions. OSHA requires any employer to have a plan, and strongly SUGGESTS that it look like 70E, but nobody will be reading 70E and writing out violations.
However, the NEC (NFPA 70, no E) is law in almost every jurisdiction in the US, and 110.16 does indeed REQUIRE arc flash labeling.
So Dan Kissel, yes your employers are required to label every panel with electrical equipment that someone may open (other than limited energy equipment like alarm, BMS or telecom) with arc flash information. Some people even extend that to junction boxes, but I don't take it that far if they are not easily accessible. If you have come across a control panel that doesn't have it, you are required to do the necessary study and apply the label. Using 70E as your guide is the best way to get there in most people's opinion.
Many people are shocked when they discover I am not a good electrician...