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I would suggest that any load related to protection, switchgear operation, alarm system, recorders, or operator safety would be on the essential bus. E.g. dc chargers, UPS, minimum important lighting. All other loads mey be relegated to the non-essential bus.

Referring to my previous question (thread238-22832) on voltage detectors vs. electric field detectors, I finally found what I was looking for. An electric field detector for use of utility personnel to alarm them in case of inadvertently energized equipment was produced by Avo, the Megger...

Does anyone know if electric field detectors are available that can be used by linesmen or other field staff to determine if an overhead line / high voltage equipment is energized? I'm looking for an electric field detector that can be used at a distance from the live parts and gives an...

Is there any national or international standard manufacturers of switchgear should comply with, that specifies some minimum number of operations at full short circuit current for a circuit breaker before it requires maintenance? While my question is a general one for all types of circuit...

Thanks to all who provided answers to my original question. Unfortunately, I apparently was not precise or clear enough about my requirements. I'm looking for information the effects of the compounds resulting from arcing in SF6 on the health of the technicians working to repair the switchgear...

Where can I find information on the web on the health effects of SF6 gas and (especially) of its decomposition byproducts after a short circuit?