Apple Power Mac G4 (Gigabit Ethernet) - Manual (Page 6)

6 Chapter 1
Plugging In the Computer
1 Make sure the voltage switch on the back of the computer is set for the kind of voltage
system to which you are connecting.
The voltage switch must be set correctly to avoid damaging your computer.
Set the switch to show “ 115” for AC voltages in
the 100– 120 V range. Set the switch to show
“ 230” for AC voltages in the 200– 240 V range.
If you need to change the setting, insert a small
screwdriver in this slot and slide the switch.