PowerWalker VFI 6000LE Plus - Manual (Page 20)

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3. Operation
3.1 Operation Safety Instructions
operation personnel
operation warning
Do not disconnect the earth conducting wire on the UPS or the
building wiring terminals in any time since this would cancel the
protective earth of the UPS system and all connected loads.
The UPS output terminal may be electrically lived even if the
UPS system is not connected to the mains power source.
Do not try to disassemble the original part of the UPS before
turn off and disconnect it from the mains power and external battery.
Do not make any liquid and foreign objects enter the UPS.
Turn off the mains input switch and external battery switch
immediately at any accident of electric shock and fire related to the
UPS.
You must read the following safety instructions before
operation!
Laymen can operate this product.