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International Efficiency Marking Protocol for External Power Supplies
2017/10/26 21:48:02

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International Efficiency Marking Protocol for External Power Supplies

Version 3.0, September 2013

This fact sheet describes the international efficiency marking protocol for external power supplies (EPSs) developed by the U.S. Environmental Protection Agency and now maintained by the U.S. Department of Energy (DOE). Sources for additional information are listed at the end of this document. This version, updated as of September 2013, replaces an earlier document released in October 2008.

What is the international efficiency marking protocol?

The international efficiency marking protocol provides a system for EPS manufacturers to designate the minimum efficiency performance of an EPS, so that finished product manufacturers and government representatives can easily determine a unit’s efficiency. This mark does not serve as a consumer information label, but rather demonstrates the performance of the EPS when tested to the internationally supported test methods. (See For More Information on page 3 for references to these test procedures.)

What does the international efficiency mark look like?

The international efficiency mark consists of a Roman numeral that corresponds to specific minimum Active and No-Load efficiency levels (as well as a power factor requirement for level V) and is printed/applied by the manufacturer on the EPS nameplate, product packaging, or accompanying documentation.

Format: Roman numeral: I, II, III, IV, V, VI, etc.

Font: Times Roman preferred (or other plain serif fonts).

Size: Legible and indelible.

Color: Text to contrast with the nameplate background, unless incorporated in the case molding.

Placement: Preferably on the EPS nameplate; however, placement on the product packaging or accompanying documentation is also acceptable. The exact location is at the discretion of the manufacturer. The text “Efficiency Level” shown in the example below is optional. 

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How is the international efficiency marking protocol being implemented?  

The nameplate, product packaging, or accompanying documentation of ac-dc and ac-ac EPSs must marked with a Roman numeral that corresponds to specific minimum Active and No-Load efficiency levels (as well as a power factor requirement for level V). The performance requirements for each Roman numeral are shown in the table below.

To determine the appropriate Roman numeral, manufacturers: 1) compare the unit’s Active, No-Load, and power factor test data (when tested in accordance with the appropriate single-voltage or multiple-voltage test method1) with the performance requirements at each level of the Roman numeral scale; and 2) choose the highest Roman numeral where the power supply meets the Active, No-Load, and power factor (where applicable) requirements. 

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What if my EPS meets different efficiency levels when tested at different voltage/frequency combinations?  

Some organizations allow manufacturers to mark an EPS capable of operating at multiple voltages/frequencies as meeting the performance requirements in only one voltage/frequency combination. For illustrative purposes, the table below provides some sample marks and an explanation of each. 

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For More Information   

Test methods for single-voltage and multiple-voltage EPSs: Title 10 of the U.S. Code of Federal Regulations, Appendix Z to Subpart B of Part 430. Available from the U.S. Government Printing Office at www.ecfr.gov.

U.S. energy conservation standards for External Power Supplies: Visit the DOE website at http://www1.eere.energy.gov/buildings/appliance_standards/index.html or e-mail the U.S. DOE at battery_chargers_and_external_power_supplies@ee.doe.gov.

ENERGY STAR: Visit the ENERGY STAR website at www.energystar.gov/powersupplies