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4.7 DC Connections
•
Access to connection points is provided through the opening in the top of the system rack
•
Access can also be provided by removing the side panels. Note that this will expose the installer to AC con-
ductors and wiring.
•
DC wires enter the cabinet either through the top (Top Feed Configured) or the bottom (Bottom Feed Config-
ured) of the cabinet.
•
A low voltage disconnect should be provided with the battery system.
4.7.1 DC Battery Cabling
•
DC battery cable terminations are designed for two-hole spade lugs (3/8" diameter on 1" centers) crimped to
the cabling, then attached to the bus bars.
•
Torque specifications for DC wiring (3/8" bolts that attach the DC lugs at the back of the DC distribution box)
are 190 – 240 inch/lbs (21.5 – 27.1 N-m).
•
Use 90°C rated copper only.
4.7.2 DC Connection Configurations
CAUTION!
A tie bar is only recommended for single feed installations. The use of a tie bar in a
two feed installation can cause current loops.
If the system is equipped with optional rectifiers, each rectifier shelf in a hybrid system is only connected to one
of the DC- battery feeds:
•
Top rectifier shelf to DC1
•
Bottom rectifier shelf to DC4
In a system with four independent battery feeds, two of these battery banks will not be charged from the AMPS
HP rectifiers. When using two independent A/B feeds, DC1 should be tied to DC2 and DC3 tied to DC4 at the
AMPS HP DC connection points. Tie bars are provided.
The following sections cover configuration for top and bottom feed systems as well as single, dual, and four inde-
pendent battery feed connections.
0260080-J0 Rev D
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