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9400016-J0 Rev D
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 0.25 V 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 con-
nection 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— five 3/8" on 1"
center lug 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 4.0kW Rectifier Shelf
The 4.0kW rectifier shelves used within the CXPS-E3 systems are 23” in width. The individual rectifier shelves are
wired to the customer provided AC termination panel. The AC input is routed through a 1” 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)
1 Phase , 208Vac – 277 Vac
6x 30A AC breakers
#10 AWG
3 Phase, 208Vac (w/o neutral)
2x 50A AC breakers
#6 AWG
3 Phase, 277/480Vac (e/w neutral)
2x 30A AC breakers
#10 AWG
7.4.3 AC Wiring-4.0kW Rectifier Shelf
Figure 23 shows the AC connections for one of the rectifier shelves. For other AC connection options (e.g. single
phase), refer to the rectifier shelf manual that ships with your system.
Terminate flex conduit at rectifier shelves—one connection each side.
Figure 23 — Shelf AC Connection (3-phase, 3-wire shown with rear cover removed)
AC wireway 1.313"
(33.4mm) for 1"
conduit
