arseegee, you present another problem that is at least as—if not more—critical. Attempting to do your work within panels or boards, with less-than-Code clearances, heavier circuits and increased short-circuit currents, {typically electrically closer to utility-owned gear} presents a significant personnel arc-blast/flash hazard. Although this has been studied and documented as a danger for decades, it is now newly added, formally enforceable language in US maintenance-oriented codes like NFPA 70E. It is referenced and enforceable by default by many state industrial-safety departments for all places of employment in their jurisdiction.
It may be difficult to withhold suggestion to the person responsible for plant facilities, {super or ?} that you would hate to see a governmental inspector and electric-utility representative show up unannounced at the same time, for they may choose to make an unscheduled service disconnection based on an “Immediately Dangerous To Life or Health” [IDLH] condition, where potentially expensive and time-consuming procedures may be required for restoration.
[Locate your portable generator (with full fuel can) and light stands now.]
