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The energy consumption of a dishwasher is measured under conditions specified in an Australian Standard. Over a year, it is assumed that the dishwasher is used 7 times per week (365 times per year). The program used for the energy labelling program is currently the one specified by the manufacturer, although by April 2004, all dishwashers will have to be re-labelled on their "normal" program using the revised AS/NZS 2007 Part 1 test method released in 2003.
The measure of energy service for a dishwasher is the number of place settings. This is the value declared by the manufacturer and defines the test load used in the Australian Standard.
To be eligible for an energy label, a dishwasher must be able meet the specified wash and dry performance criteria defined in the Australian Standard.
The Base Energy Consumption defines the "1 star" line for particular products. An additional star is awarded when the CEC of the model is reduced by a defined percentage from the BEC. The energy reduction per star is 30% for dishwashers. For example, a model that had a CEC that was 0.70 of the BEC or less would achieve 2 stars. Similar, a CEC of 0.49 (0.70 x 0.70) of the BEC or less would achieve 3 stars and so on.
The detailed star rating equations are contained in the document 
"Equations for Appliance Star Ratings".
There is an overview of how star ratings are calculated for other products on this site.
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