In general, this standard applies to automatic electrical controls for use in, on, or in association with equipment for household and similar use, including controls for heating, air conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. This consolidated version consists of the third edition (1999), its amendment 1 (2003) and its amendment 2 (2007). Therefore, no need to order amendments in addition to this publication.