In general, this standard applies to timers and time switches for household and similar use that may use electricity, gas, oii, solid fuel, solar thermal energy, etc. or a combination thereof, including heating, air conditioning and similar applications.
Throughout this standard the word "tirneri;" means timers and time switches, unless the type is specifically mentioned.
Devices which only indicate time or passage of tiine are not included.
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 does not apply to time-delay switches (T.D.S.) within the scope of IEC 669-2-3.