Application Guide

SAG584000300 System Application Guide
Issue AB, April 5, 2013 NetSure™ 4015 30kW 400V DC Power System
Spec. No. 584000300 (Model 4015-X003)
Page 22 of 32
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Return Busbar (-Bus) Grounding (NPG Configurations Only)
The return busbar (–Bus) in a negative pole ground (NPG) configuration is to be connected to ground. A
grounding connection point for the return busbar (-Bus) is provided on the negative bus in the power and
control sub-rack. This connection can also be made on the rear of the load distribution sub-rack, if furnished.
Note: When the system is pre-assembled and pre-wired in a factory furnished IT rack (List R1, R2), a
grounding lead is factory connected between the –Bus in the power and control sub-rack and the rack
ground bar located on the rear left side of the furnished IT rack.
Refer to Table 6 for recommended grounding wire size and lug selection. For convenience, a grounding
cable is furnished loose as shown in Table 6.
Return Busbar (-Bus) Grounding
Recommended
Wire Size
Lug Requirements
Recommended Lug
(Emerson P/N)
Furnished Grounding Cable
4 AWG
(25mm
2
)
To Power and
Control Sub-Rack:
2-Hole,
1/4” Bolt Clearance
Holes, 5/8" Centers
245346800
P/N 555262, 965mm (38”),
terminated on both ends with
lug P/N 245346800.
To Load Distribution
Sub-Rack: None
(screw-clamp type
terminal provided)
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Table 6
Recommended Return Busbar (-Bus) Grounding Wire Size and Lug (NPG Configurations Only)