33
G8000 Series with Isolated Output Installation and Operation Manual
11.3 Grounding Wire
WARNING
Be sure to ground the UPS as specied.
Using the UPS without a proper ground will deteriorate the insulation,
cause leakage of currents and electric shock.The resistance to ground
should be less than or equal to 10 ohms.
The 100/150 kVA earth grounding bus is located inside, at the bottom-front of the unit. The 150 kVA earth
grounding buss is accessable through either the bottom or top knockout panel.
Use a 2 AWG (or 38 mm
2
) or larger cable for the grounding wire. Run the grounding wire through the
opening at the bottom, or alternately through the top if a 150 kVA unit.
The ground wire must have a crimp terminal with a 1/2” (12 mm) diameter bolt hole. The ground bus has
a 33/64” (13 mm) bolt hole. The crimp terminal and ground bus should be connected together using a
7/16” (10 mm) diameter bolt.
FIGURE 11.7 - EARTH GROUND WIRE
100 kVA
12 mm or 1/2”
Terminal
Ground bus
10 mm or
7/16” Bolt
Feed-through opening
2 AWG (38 mm2)
ground wire
To facility
earth ground
Ground bus
12 mm or 1/2”
Terminal
10 mm or
7/16” Bolt
Feed-through opening
2 AWG (38 mm)
ground wire
To facility
earth ground
Facility earth ground.
Alternate ground wire routing
through top knockout plate.
Note: Use either the top or the
bottom access for the ground
wire to connect to the ground
buss, but use only one ground
wire.
150 kVA
