PowerWalker VFI 1000 LE - Manual (Page 18)

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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.
Do not try to disassemble the original part of the UPS before turn off
and disconnect it from the mains power & external battery.
The UPS output socket may be electrically lived even if the UPS
system is not connected to the mains power source.
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.