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Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-06
Chapter 2 Power and Cooling
AC Power Requirements
Figure 2-4 AC Wye Power Cord Plug
Figure 2-5 AC Delta Power Cord Plug
For detailed AC power specifications, see the “Line Card Chassis Specifications” section on page 3-1.
In addition, the next section “AC PDU Wiring” describes the 3-phase wiring for AC Delta and Wye
configurations.
AC PDU Wiring
This section contains a brief description of the 3-phase wiring for AC Delta and Wye configurations that
facilities electricians should understand.
AC Delta and AC Wye are both basically 200 to 240 VAC input power:
• AC Delta 3-phase wiring is typically used in the United States, Japan, and other countries where the
phase-to-neutral voltage is approximately 120 VAC and 208 VAC phase to phase.
• AC Wye 3-phase wiring is typically used in Europe and countries where each phase-to-neutral
voltage is approximately 220 VAC.
AC Delta 3-Phase Wiring
Figure 2-6 shows a PDU wired for AC Delta 3-phase power. As shown, input AC power is routed to three
internal 2.5-kW power modules in the rectifier, where it is converted into DC power (nominal 54.5 VDC,
46 ADC) and routed to the three load zones of the chassis.
The AC Delta PDU is shipped with a 14-foot (4.3 m) AC power cord with a 4-pin L15-30P plug.
116877
To AC outlet
116876
To AC outlet