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4300 Series Ancillary Cabinets Installation and Operation Manual
8.4 Grounding Wire
WARNING
Be sure to ground the UPS and ancillary cabinets as specied.
Using the UPS and ancillary cabinets without a proper ground will
deteriorate the insulation, cause leakage of currents and electric
shock. The resistance to ground should be 10 ohms or less.
The earth grounding bus for 431A and 431B are located inside, at the bottom-left front of each cabinet.
The earth grounding bus for 431M is located on the right side wall just above the inter-cabinet access
port.
Use a AWG 2 (or 38 mm
2
) or larger cable for the grounding wire. Run the grounding wire through the
opening at the bottom, through a hole in the top knockout plate or through the side access hole. Connect
the grounding wire to the earth ground bus.
The ground wire must have a crimp terminal with a 3/16 in. (4.76 mm) diameter screw hole. The ground
bus has twelve (12) 0.163 in. (4.1 mm) holes tapped for a 10/32 screw. Connect the crimp terminal and
ground bus together using a 10/32 screw.
Figure 8-4 - Example: UPS Ground Bus