This would not be an OSHA issue, it would be a NEC issue. It looks like it falls under NEC 110.26(c) Do a google search for that and see if it helps you out.
I joined this forum just to answer this question. Sorry if it is late, but at least all that read it from now on will know the answer.
The OSHA regulation 1910.147(c)(5)(ii) states "Lockout devices and tagout devices shall be singularly identified; shall be the only devices(s) used for...