Hello and welcome to the forums. Two options you might consider for mitigating risk at the transfer switch are 1) an external bypass to allow safe testing or servicing of the unpowered switch cabinet while the critical load remains powered up and 2) redundant switches. In my experience, option 1, along with a regular testing and maintenance program, is equally reliable and much more cost-effective than option 2.
Hope that helps.
Ken
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DR/BC Planner
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