Automatic electrical controls for household and similar use - Part 2-7: Particular requirements for timers and time switches

2Scope / Description

"In general@ this part of IEC 60730 applies to timers and time switches that may use electricity@ gas@ oil@ solid fuel@ solar thermal energy@ etc. or a combination thereof@ including heating@ air conditioning and similar applications. This standard is also applicable to individual timers utilized as part of a control system or timers which are mechanically integral with multifunctional controls having non-electrical outputs. This standard does not apply to time-delay switches (TDS) within the scope of IEC 60669-2-3. NOTE 1 Throughout this standard@ the word ""timers"" means timers and time switches@ unless the type is specifically mentioned. NOTE 2 Devices which only indicate time or passage of time are not included. NOTE 3 This standard does not apply to multi-functional controls having an integrated timing function which is not capable of being tested as a separate timing device. This standard applies to the inherent safety@ to the operating characteristics where such are associated with equipment protection and to the testing of timers used in appliances and other apparatus@ electrical and non-electrical@ for household and similar purposes@ but also extended to industrial purposes when no dedicated product standards exist@ such as that for central heating@ air conditioning@ process heating@ etc. Timers for equipment not intended for normal household use@ but which nevertheless may be used by the public@ such as equipment intended to be used by laymen in shops@ in light industry and on farms@ are within the scope of this standard. This standard is also applicable to timers for appliances within the scope of IEC 60335-1. This standard applies to manual controls when such are electrically and/or mechanically integral with timers. This standard applies also to timers incorporating electronic devices@ requirements for which are contained in Annex H. This standard applies also to timers using NTC or PTC thermistors@ requirements for which are contained in Part 1@ Annex J."