paco SWR-3000VA Instruction Manual page 10

In a stationary land based installation, the earth terminal should be
connected to a metal earthing stake driven into the ground to a depth of
1.2m or more.
Model: 3KVA, 5KVA
Input Output
Model: 8KVA, 10KVA
Input
GND
NOTE:
The earth terminal of the AC outlet is connected to the neutral terminal.
This is the same as a standard household power point where the neutral line is
bonded to earth and there is normally no voltage between them.
Output
GND
Output
9
GROUND TERMINAL
GROUND TERMINAL