Tripp Lite
1111 W. 35th Street
Chicago, IL 60609
1 773.869.1774
1 773.869.1329
presaleshelp@tripplite.com

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 Tripp Lite 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 Tripp Lite'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
Voltage
(Single-Phase)
Max Input Amps kW/kVA
Capacity
per PDU
kW/kVA
Capacity
per Load Bank[1]
Switched/Vertical PDU Models
NEMA 5-15R 120 120 12 1.44 1 x 1.44 PDUMV15NET
NEMA 5-20R or NEMA L5-20R 120 120 16 1.92 1 x 1.92 PDUMV20NET
PDUMVR20NET
NEMA L5-30R 120 120 24 2.88 2 x 1.44 PDUMV30NET
PDUMVR30NET
NEMA L6-20R 208 208 16 3.33 1 x 3.33 PDUMV20HVNET
PDUMV20HVNET2
NEMA L6-30R 208 208 24 5.0 2 x 2.5 PDUMV30HVNET
PDUMVR30HVNET
NEMA L15-20R or NEMA L21-20R 208
(3-Phase)
208 16 5.7 3 x 1.91 PDU3VSR10L1520
PDU3VSR10L2120
NEMA L15-30R or NEMA L21-30R 208
(3-Phase)
208 24 8.6 3 x 2.87 PDU3VSR10L1530
PDU3VSR10L2130
Hubbell® CS8365C 208
(3-Phase)
208 35 12.6 3 x 4.16 PDU3VSR10H50
Hubbell® CS8365C 208
(3-Phase)
208 45 14.4 6 x 2.4 PDU3VSR6H50A
IEC-309 Blue 60 A 208
(3-Phase)
208 35 12.6 3 x 4.16 PDU3VSR10G60
IEC-309 Blue 60 A 208
(3-Phase)
208 45 16.2 6 x 2.7 PDU3VSR6G60A
NEMA L22-20P 415
(3-Phase)
240 16 11.5 3 x 3.84 PDU3XMV6L2220[2]
NEMA L22-30P 415
(3-Phase)
240 24 17.3 6 x 2.88 PDU3XVSR6L2230
PDU3XVSR6L2230B
IEC-309 Red 60 A 415
(3-Phase)
240 35 25.2 6 x 4.2 PDU3XVSR6G60A
PDU3XVSR6G60B
IEC-309 Red 63 A 415
(3-Phase)
240 40 28.8 6 x 4.8 PDU3XVSR6G63A
PDU3XVSR6G63B
Hardwire 415
(3-Phase)
240 40 28.8 6 x 4.8 PDU3XVSRHWA
PDU3XVSRHWB

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

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Need help with your purchase?
We're always available to help with questions, including product selection, sizing, installation and product customization. Call us at 1 773.869.1774 or email presaleshelp@tripplite.com.