Show me in either the NEC code (for ist stickers)
or 70 E (for second stickers) The design issue statement please???
There are no specific label application requirements in NEC or NFPA70E.
It is up to your customer to decide what the label layout will look like. It is their choice what the label says. It is their choice on where the labels go. NFPA 70 requires the employer to design an Electrical Safe Work Practices program. Part of that program should be training on the label locations and information for that employer.
I have customers put labels on the lug compartment for a busway run that is over 200' long, their ESWP says got to the beginning of the bus duct to find the proper label. I have had some customers put a label on every 10' piece of duct. There was even a customer that was going to make a label large enough that it could be read from the floor 20' away.
For MCC's I think my customers are evenly split between those that want (1) label only on the lugs compartment (right next to the nameplate) and those that want labels on every vertical wireway door.