This is similar to mechanical lockout where 1910.147 states that verification of isolation to a piece of machinery must take place prior to conducting service and maintenance tasks.

Page 2 of 2. A Guide to LOTO's Eight Critical Elements. Mar 01, 2006; THE lockout/tagout standard--29 CFR 1910.147--is arguably the best OSHA standard ever written. For the price of a lock and tag ...

6. Verification of isolation: lock-tag-try. Verification of isolation must be performed by every employee prior to commencing servicing and maintenance activities. Many companies refer to their ...

You can, of course, remove the one lock (per isolation point), add a group hasp and make room for each participant to add his or her protection. But remember, this is short-term activity, and to ...