Re: Testing 813's.
As I see it, there are several power supplies connected in series. Each power supply will provide <270V and will feed into the string. There will be no very high voltage on the power supply. There is the possibility of reverse voltage with a fault but the bridge rectifier will take care of that.
The winding at the 'top' will have a very high voltage to the core so must be insulated very well.
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