NEMA AC Input and Output Connector Styles….. Are You Confused?

by Jennifer, Inside Sales Associate 6. July 2011 08:35

If you find yourself confused about what NEMA AC input and output connector styles exist, you’re not alone.  It can truly be confusing to the untrained eye.

Different types of AC input and output connectors are designed to address various wiring systems. Each unique design also aids in the area of safety, as only the appropriate plug will fit into the proper receptacle. For example, the 5-20R outlet is capable of accepting the 5-20P as well as the 5-15P. However, the 5-20P will not connect to a 5-15R. A quick reference guide is provided below to serve as a helpful tool in clearing up some of that confusion.

**Fields highlighted in yellow are 3Ø∆; Fields highlighted in green are 3ØY

Three Phase Power Distribution: de·fined

by Mindy, Product Marketing Specialist 1. July 2011 09:26


It has been estimated that up to 30% of a company’s IT budget is spent on energy costs. With the growing demand for an increase in power supply in the infrastructure world, it is inherently obvious that these costs will only increase. Therefore, the need for greater energy efficiency is also on the rise. One solution to the "greater power + greater efficiency" crisis is three-phase power.

How does 3-phase power work?
Three-phase power (3Ø) is a method of electric power transmission utilizing three circuit conductors that carry three alternating currents which reach their peak values at different times. Each phase is offset 1/3 of cycle of current from the other phases. This smoother wave form provides a more constant source of power than single-phase, two-phase, or direct-current systems. (See the diagram below)

Why consider 3-phase power?
The benefits of 3 Phase power include but are not limited to:

  • Greater power - A 3-phase system delivers 1.732 times the amount of power a single-phase system can produce.
  • Energy efficiency - The power transfer is more constant due to all three wires carrying the same current. In a single phase unit, during each cycle power drops to zero three times. In a 3-phase unit power never drops to zero. This causes less pulsating in the power transfer.
  • More cabinet space - Few PDUs with less wires are required to power equipment ( A cleaner and clutter-free area under a raised floor isn't hard to accept for a facility manager!)
  • Lower current levels in each conductor - Facilitating the use of smaller conductors (  Conductors are ¾ the size of conductors for single phase units with the same power output.)
  • Lower cost of ownership via the physical power installation (i.e. one run of three phase cabling vs. 3 individual runs of single phase wiring.)

Three-phase power distribution is a highly efficient solution to current energy demands. Stay tuned to learn more about the different types of 3-phase power and how they may assist to meet your power goals.

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