This document provides a methodology for determining the energy efficiency class of electrical accessories, to enable the system designer to determine the most efficient components for an electrical installation, also considering all functionalities. NOTE Functionalities are for example: wireless communication, network connectivity, timer, energy monitoring. This methodology is based on the energy consumption, taking into account the individual functions of the accessory. The energy efficiency class approach contributes to the overall reduction of the energy consumption of an electrical installation. This group EE publication is primarily intended to be used as an EE standard for the products mentioned in the scope, but is also intended to be used by technical committees in the preparation of publications for products similar to those mentioned in the scope of this document, in accordance with the principles laid down in IEC Guide 118 and IEC Guide 119.