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Three Questions to Ask About Three Phase Power Distribution

Posted by RJ Tee on Mar 10, 2017 9:30:24 AM

Across the globe, data center managers are making the move to 60A service at the rack level. Why? One big reason is because it better supports higher-density applications. As a result, three-phase power distribution is seeing a boost in popularity. Put simply, it just makes sense for data centers from economic and efficiency standpoints.

A popular choice for those looking to make the move to alternating phase power is the HDOT Switched power distribution unit from Server Technology. These rack-mount PDUs simplify time consuming processes such as cable management and load balancing. Offering up to a 30 percent footprint reduction, HDOT PDUs let you install more servers per rack and create a much more efficient flow over standard one- or two-phase power by using three-phase power distribution.

As you weigh your options for power distribution solutions, it’s crucial to ask all the right questions. In particular, you should train your focus on the issues of load balancing, its impact on power bills and related power loss.

Questions to ask when considering three-phase power distribution:

  1. Are my phases properly balanced? If all three phases aren’t correctly balanced, more heat will be generated. This leads to higher cooling costs.
  2. What’s the impact on my power bill? When loads are unbalanced, inefficiency follows, and so do skyrocketing power bills.
  3. Am I running too high of a load on my single phases? This is a risky approach and can result in tripped PDUs and upstream breakers. This leads to power loss at the rack level.

Opting for a switched rack-mount PDU from Server Technology can help alleviate the potential problems of a single- or two-phase load by distributing alternate phased power on a per-outlet basis rather than per branch. And, when you choose an HDOT unit, you’re getting the highest outlet count in the most compact form factor on the market.

As densities and power in the racks continue to grow, and as data center managers install more and more gear in the cabinets, it’s no secret power requirements are also rising. With an HDOT Switched rack PDU in your corner, you’ll not only survive, but thrive when it comes to efficiency and savings.

Topics: HDOT, Alternating phase, HDOT Switched, three phase power

The Top Benefits of True HDOT With Alternating Phase Outlets

Posted by Josh Schaap on Jul 11, 2016 12:40:30 PM


In the past, a standard rack only held about nine servers and consumed around 6 kW of power when running at full capacity. With this load capability, you could safely power a full rack using a single-phase power distribution unit (PDU).

Times have changed, though, as the servers you are using today are slimmer and more powerful, which allows for much greater density in the rack. Now, you can fit about 10 times as many servers onto a single rack, which can save valuable data center real estate. For this reason, many data centers are now experimenting with higher cabinet densities to maximize output.

As convenient as this is, however, it also presents a challenge from a power management perspective. The more servers you add to a rack, the more power you will draw. A full rack of blade servers, for instance, can easily consume around 20 kW of electricity or more depending on your usage. Running a single-phase PDU with such a heavy load is a sure-fire way to trip your circuit breakers and cause a power outage.

So, what can you use to run high-density power loads both safely and efficiently?

Consider investing in Server Technology’s patented, market-leading High Density Outlet Technology (HDOT) Alternating Phase PDUs—specifically engineered for data centers with limited cabinet space and heavy power workloads. HDOT Alternating Phase PDUs deliver three-phase power distribution to the rack, providing over 50 percent more electricity. With 42 C13 outlets in a 42U-high by 1U-wide device, HDOT offers the highest outlet density on a connected PDU. 

Here are the top benefits of using HDOT Alternating Phase PDUs in your data center:

Easier load balancing for three-phase PDUs: Load balancing is necessary for reasons related to safety and power efficiency; unbalanced power loads, for instance, can cause uneven voltage and current measurements, which can be harmful to your equipment. Unbalanced loads can also trip your circuit breakers. Whereas load balancing can be a confusing and time-consuming task, HDOT simplifies the process with an alternating phase arrangement that will allow you to alternate phase pairs on a per-outlet basis. The result is less clutter and shorter cords.

Convenient size: Part of what makes HDOT so popular is its stripped-down, convenient size. When creating the HDOT product line, Server Technology’s designers removed all of the unnecessary material around each outlet. Like other PDUs in the HDOT family, the only thing that remains on the HDOT Alternating Phase PDUs is the core outlet structure, which makes them easier to mount in or around tightly packed cabinets.

High native cord retention: We’ve all been there: You’re performing routine maintenance in your data center and you accidentally bump into a power cord, causing it to disconnect from its outlet. It happens quite frequently in the data center, especially when moving equipment. Traditionally, the solution was to invest in expensive, custom ancillary cord-locking devices for each outlet. HDOT streamlines the process by using high native cord retention, which holds plugs firmly in place while they are attached to an outlet. So, once you plug a device into an HDOT Alternating Phase PDU, you can rest assured that it will stay exactly where you put it.

Custom design: When purchasing an HDOT PDU, you can choose a configuration that meets your exact needs using Server Technology’s “build your own PDU” program. The process takes just seven steps, and is a walk through where you will select everything from your voltage, amperage and phase requirements to power input, orientation, outlets, connectivity and quantity preferences. This program can also be used to build HDOT Switched, Smart and Metered PDUs. 


Want to learn more about how Server Technology can help your business improve its power density strategy? Click here.

Topics: HDOT, Alternating phase

Your All-In-1 PDU Solution - HDOT Switched

Posted by Erik Stabile on Mar 10, 2015 12:49:36 PM


Introducing the High Density Outlet Technology (HDOT) Switched PDU, your All-in-1 PDU Solution. The HDOT Switched PDU is the most versatile solution for today’s demanding data center environment, which combines Server Technology’s best solutions in an All-in-1 PDU,  it includes

  • HDOT- most outlets in the right place in a smaller form factor
  • Alternating Phase Outlets- provides easy load balancing, better airflow and greater efficiencies
  • PRO2 a flexible and feature rich hardware and firmware platform.

See the press release to learn more or new Solution Video.  

Topics: HDOT, PDUs, Alternating phase, PRO2, New Products, HDOT Switched, Products

Upgrade Your Power Distribution With HDOT Alt. Phase PDUs

Posted by Travis Irons on Aug 22, 2014 9:24:00 AM

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Right now data center power consumption is on the rise in North America, as the number of racks increased by 9.1 percent in Canada and 4.3 percent in the U.S. in 2013. All signs are showing this trend continuing through 2014 and beyond as data centers standardize on high-density equipment to achieve more processing power in a smaller space.

As power requirements increase, data center managers everywhere are looking for ways to deliver more power to the computer cabinet in a cost-effective way. One way they are accomplishing this is by upgrading their power distribution systems from single phase to three phase.

Why are three phase systems more cost efficient? A single phase power cord contains three wires. A three-phase delta power cord contains four wires. For that one additional wire, three phase delta delivers 52% more power than single phase. But it doesn’t come without risks.

Thankfully, Server Technology makes it easy and risk-free for you to migrate to three phase power distribution with its new line of alternating phase power distribution units (PDU).  These PDU’s alternate the phase pairs on a per-outlet basis instead of a per branch basis.

In addition, Server Technology has incorporated its patented High Density Outlet Technology (HDOT) into the Alternating Phase PDU’s, resulting in the maximum achievable number of outlets in the smallest form factor PDU. This provides the utmost flexibility when it comes to supporting the myriad array of IT equipment in the rack.

Here are some major benefits HDOT Alternating Phase PDUs can provide:  

Phase Balancing simplified:  The inherent design of Server Technology’s Alternating Phase PDUs simplifies the task of balancing equipment loads across the multiple branches of the PDU.  The alternating phase outlet arrangement allows a simple ‘top down’ deployment of the equipment connections to the PDU, resulting in minimal cord runs, which de-clutters the back of the rack and improves air flow.

Less chance of power overload:  Unbalanced branches can result in a circuit breaker trip during a fail over event. Alternating phase PDU’s minimize the chance of running with unbalanced loads due to the ease of balancing. 

Data Center Power Efficiency:  Large Phase imbalances in the data center can lead to voltage and current distortions on the individual phases, increased heat dissipation, and reduced equipment life. Phase balancing in the data center starts at the PDU.  Alternating Phase PDU’s simplify the phase balancing challenge.

More Outlets in a Smaller Space: Taller racks with smaller footprints push the need for smaller, denser PDU’s. Server Technology’s (HDOT) provides the highest outlet density of any network PDU on the market.     


Want to learn more? Click here to read the Server Technology white paper.

Topics: HDOT, power consumption, Data Center, PDU, power efficiency, Server Technology, high density outlet technology, cost-effective, three phase, phase balancing, Alternating phase, 3 phase

The Secret to Safe, Affordable Three Phase Power Distribution

Posted by Travis Irons on Aug 21, 2014 8:44:00 AM

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Up until now, you were able to power your servers and applications using a 30A single phase, 208V power distribution unit (PDU) that contained two 20A circuit breakers. This power cord feeding this PDU contained two power wires and a ground wire. In order to properly distribute 30A of power without overloading any branch, you needed two 20A branches with an equal quantity of outlets per branch.

But now, you are investing in denser applications that require more power. To achieve this power density, you are considering upgrading your cabinet power feeds to three-phase distribution and 60A service. Doing so will increase your power availability from 5kW to 17.2 kW, but it will also require tripling the number of branches in your PDU from two to six.  

When utilizing a three-phase six branch PDU, balancing your loads evenly across the six branches is very important so as not to overload a single branch. In addition, as outlined in a recent Server Technology white paper, equally loading all three phases in the data center will result in the highest power usage efficiency, minimizing heat in your cable runs, as well decreasing the likelihood of tripping an upstream circuit breaker.

Traditional PDU’s have branches bunched together in groups along the length of the device, requiring a multitude of different cable lengths from the PDU to the equipment to achieve balanced loads.  This scenario typically results in a large amount of cable in the back of the cabinet which subsequently inhibits air flow increasing heat, and shortening equipment life.

You can overcome these challenges by using an alternating phase PDU from Server Technology.  In alternating phase PDU’s, the six branches are distributed on an outlet by outlet basis instead of grouped together in six discreet zones.  This results in shorter power cords between the rack equipment and PDU, resulting in a cleaner cable structure and maximum air flow.  Assembly also becomes faster and easier, as the installer typically just needs to connect the equipment to the nearest outlet, and the branches inherently balance.  

Are you ready to increase your power flow, safely, efficiently and affordably? Click here to view Server Technology’s complete line of alternating phase PDUs.

Topics: power density, PDU, Server Technology, power usage efficiency, 30A, Alternating phase, single phase

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