This standard specifies the safety requirements for lighting strings with incandescent bulbs connected in parallel or in series, with a supply voltage not exceeding 250 V, for indoor or outdoor use. This standard shall be used together with GB 7000.1-1996. NOTE Christmas tree string lights are an example of string lights in series. Lighting strings for ski runs or promenades, walkways) are an example of strings with parallel bulbs. Light strings with plug-in lamp holders shall apply the corresponding requirements of this standard. In some countries the word "chains" is replaced by "strings".