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18 Specifications
3.4 Externally Mounted Battery Return Busbar
The battery return busbar is designed to mount on the overhead racking for 6000 A systems and
top cabled 1500, 3000 or 4000 A power systems. It can also be mounted on a wall or on the floor
below the raised floor for bottom cabled 1500, 3000 or 4000 A power systems (which are assumed
to be installed on a raised, computer type floor).
3.4.1 Mechanical Specifications of the External Battery Return Busbar
The external battery return busbar kit consists of a group of single busbar laminations and
attachment hardware assembled as shown in
Figure 17
(6000 A shown). The kit can grow verti-
cally in such a way as to maintain the 3-ft maximum radius grounding requirement. Laminations
are added as required to increase the capacity. The mechanical specifications of a single lamina-
tion are listed in
Table 22.
Figure 17 Top and side views of the external battery return busbar
3.4.2 Electrical Specifications of the External Battery Return Busbar
A single busbar lamination has a current carrying capacity of 3000 A.
Table 22 Mechanical specifications of a single lamination
Figure Length Width Thickness
Figure 17
863.6 mm
(34 inches)
152.4 mm
(6 inches)
12.7 mm
(0.5 inches)
NOTE
All bars and details are 0.5 in. thick.
* For a 1500 A system, only the bottom level is provided for the external
battery return ground bar.
Top view of the external ground bar
Side view of the external ground bar installed on
auxiliary framing above the power system
Smaller busbar for
small wires and cables
Future growth as required
Available
configurations:
= 1500*
&
3000 A
= 4000
A
= 6000
A
34” (864 mm)
6” (152 mm)
6”