9400016-J0 Rev E
40
User Guide
CXPS-E3
7.4 DC wiring
WARNING!
Leave cables or busbars disconnected at the battery and verify the output
polarity using a voltmeter. Make battery connections only after all other wiring is
completed.
DC output wire must be UL approved XHHW or RHH/RHW (for Canadian users, RW90 Type). Control and sense
wires must be UL approved Style 1015 (for Canadian users, TEW type).
The common output leg of the rectifier system must be connected to ground, typically at the battery return bus.
7.4.1 External battery bay output connections
Battery cables must be sized for a 0.25V drop from the battery to the power system at full load including
anticipated growth. The cables must also meet ampacity requirements. Cables terminating directly on the battery
posts or connection details must be secured so that there is no stress on the battery posts. Lead plated lugs and
lead plated or stainless steel hardware must be used on all terminations at vented batteries to reduce corrosion.
1. Prepare, route, and connect cables from the power system to the battery termination details—connections
are available for both hot and return.
2. Burnish the terminating points and apply a corrosion-inhibiting agent, such as NO-OX-ID “A”, to all battery
terminal connections.
3. Do not complete the final live connections to the battery. Leave open and insulate the final connections or
remove the battery fuses. Switch off the battery contacts if used.
Refer to the system startup procedure before connecting the batteries online.
7.4.2
AC wiring for 4.0kW | 4.6kW rectifier shelf
The 4.0kW | 4.6kW rectifier shelves used within the CXPS-E3 systems are 19- or 23 inches in width. The
individual rectifier shelves are wired to the customer provided AC termination panel. The AC input is routed
through a 1 inch trade size knockout on the side of the shelf for a direct connection. The AC wiring size depends
upon the rectifier shelf voltage configuration and the local electrical code.
The recommended AC breaker and wire gauge sizes are as follows:
Rectifier shelf
Recommended AC breaker size (A) Recommended AC wire size
(AWG)
Single phase , 208Vac – 277 Vac
6× 30A AC breakers
#10 AWG
Three phase, 208Vac (without neutral)
2× 50A AC breakers
#6 AWG
Three phase, 277/480Vac (with neutral) 2× 30A AC breakers
#10 AWG
7.4.3
AC wiring for 4.0kW rectifier shelf
Figure 21 shows the AC connections for one of the rectifier shelves. For other AC connection options (for
example, single phase), refer to the rectifier shelf manual that ships with your system.
Terminate flex conduit at rectifier shelves—one connection each side.
Figure 21 — Shelf AC connection (three-phase, three-wire shown with back cover removed)
AC wireway 1.313"
(33.4mm) for 1"
conduit
