If the customer load cannot be power-off, what should be taken care when closing the maintenance bypass switch? (Multiple choice)
A . The maintenance bypass switch can also be closed in the inverter power supply mode.
B . Turn off the inverter, let the UPS be in bypass power supply mode and then close the maintenance bypass switch.
C . First perform EPO then close maintenance switch
D . Close the maintenance switch first and then execute the EP
Answer: BD
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