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7 Steps to Choosing the Right Single-Phase or 3-Phase PDU

  1. Determine your IT equipment load in watts, including room for future growth. This is the maximum load that must be supported by a single PDU in a single rack, not the total load for the entire data center. (If you need assistance, contact Eaton or use the interactive load calculator.)
  2. Refer to Table 1 (shown below) to determine which circuits can supply the power capacity your application requires. (To reduce the chance of downtime, do not load the PDU over 80% of maximum, or 40% for redundant configurations.)
  3. Review the available circuit options with your facility manager to find out which circuits are most feasible for your site. Some options will be easier to set up and some options will be more difficult and/or costly, so you'll need to find the best balance between your technical requirements and what's most practical for your organization.
  4. After you pick a circuit, review the PDUs that can plug into the circuit. Check each PDU's outlet configuration to make sure you will have enough outlets of the correct voltage and type to connect your equipment. (Whether you decide to use single-phase or 3-phase input power, the output power supplied to your IT equipment by the PDU will be single-phase.)
  5. For PDUs with multiple load banks, make sure the loads can fit on each bank without overloading an individual load bank or creating a load imbalance. A perfectly balanced load may not be possible, but get as close as you can.
  6. If your equipment has redundant power supplies, you should connect the power supplies to redundant PDUs that are connected to redundant supply circuits and UPS systems in order to provide maximum power availability. If your equipment has a single power supply, consider connecting it to a PDU with a built-in automatic transfer switch (ATS) to provide increased power availability. Whether you decide to provide redundant power will depend on your budget and the system availability requirements of your application. Your organization's cost of downtime will help you determine what level of redundancy will be most cost-effective.
  7. Nothing can replace the advice of an experienced power professional. For free advice from an expert, contact Eaton's application engineers. Call +1 (888) 447-6227 or email us.

Table 1: Rack-Level AC Power Distribution (North American Applications)

"Wall" Outlet Type Input Voltage Output
Max Input Amps kW/kVA
per PDU
per Load Bank[1]
Switched/Vertical PDU Models
NEMA 5-15R 120 120 12 1.44 1 x 1.44 PDUMV15NETLX
NEMA 5-20R or NEMA L5-20R 120 120 16 1.92 1 x 1.92 PDUMV20NETLX
NEMA L5-30R 120 120 24 2.88 2 x 1.44 PDUMV30NETLX
NEMA L6-20R 208 208 16 3.33 1 x 3.33 PDUMV20HVNETLX
NEMA L6-30R 208 208 24 5.0 2 x 2.5 PDUMV30HVNETLX
NEMA L15-20R or NEMA L21-20R 208
208 16 6.7 3 x 2.23 PDU3EVSR6L1520
NEMA L15-30R or NEMA L21-30R 208
208 24 10.0 3 x 3.33 PDU3EVSR10L1530
Hubbell® CS8365C 208
208 35 14.5 3 x 4.83 PDU3EVSR10H50
Hubbell® CS8365C 208
208 45 14.4 6 x 2.4 PDU3EVSR6H50A
IEC-309 Blue 60 A 208
208 35 14.5 3 x 4.83 PDU3EVSR6G60
IEC-309 Blue 60 A 208
208 45 16.2 6 x 2.7 PDU3VSR6G60A
NEMA L22-30P 415
240 24 17.3 6 x 2.88 PDU3XEVSR6L230B
IEC-309 Red 60 A 415
240 35 25.2 6 x 4.2 PDU3XEVSR6G60A
IEC-309 Red 63 A 415
240 40 28.8 6 x 4.8 PDU3XEVSR6G63A
Hardwire 415
240 40 28.8 6 x 4.8 PDU3XEVSRHWA

Note: TAA-compliant models are also available. [1] Balanced load. [2] Metered model.

Need help with your purchase?
We're always available to help with questions, including product selection, sizing, installation and product customization. Call us at +1 773-869-1776 or email