NonStop NS2400 Series Planning Guide

Figure 55 (page 182) shows the AC power feed cables from the bottom of the cabinet for the
three-phase PDU when the optional UPS and ERM are installed.
Figure 55 Bottom AC Feed With UPS and ERM Installed, Three-Phase
Each PDU is wired to distribute the load segments to its receptacles.
CAUTION: If you are installing NonStop NS2400 series system enclosures in a rack, balance
the current load among the available load segments. Using only one of the available load segments,
especially for larger systems, can cause unbalanced loading and might violate applicable electrical
codes. Connecting the two power plugs from an enclosure to the same load segment causes failure
of the hardware if that load segment fails.
PDU Strapping Configurations for NonStop NS2400 Series Systems in G2 Racks
PDUs are available in four static strapping configurations that are factory-installed in a modular
cabinet. The specific PDU strapping configuration for a particular site depends on the type and
voltage of AC power at the intended installation site for the system. For information on the PDUs
supported for a NonStop NS2400 series system, see “AC Input Power for Modular Cabinets in
G2 Racks” (page 182).
AC Input Power for Modular Cabinets in G2 Racks
This subsection provides information about AC input power for NonStop NS2400 modular cabinets
and covers these topics:
Single-Phase Power Specifications
• “North America and Japan: 200 to 240V AC, Monitored Single-Phase PDU Power” (page 183)
• “International: 200 to 240V AC, Monitored Single-Phase PDU Power” (page 183)
• “Branch Circuits and Circuit Breakers, Monitored Single-Phase PDUs” (page 184)
• “North America and Japan: 200 to 240V AC, Modular Single-Phase PDU Power” (page 184)
• “Branch Circuits and Circuit Breakers, Modular Single-Phase PDUs” (page 185)
• “Circuit Breaker Ratings for Single-Phase UPS” (page 185)
Three-Phase Power Specifications
• “North America and Japan: 200 to 240V AC, Three-Phase PDU Power” (page 186)
• “International: 380 to 415V AC, Three-Phase PDU Power” (page 186)
182 Power Configurations for NonStop NS2400 Series Systems in G2 Racks