This International Standard applies to bayonet lamphoiders B15d and B22d for connection of lamps and semi-luminaires to a supply voltage of 250 V.
As far as it reasonably applies, the standard also covers lamphoiders which are wholly or partly integral with a luminaire or intended to be built into appliances.
Independent lamphoiders, e.g. backplate lamphoiders, not specifically intended for building-in, are submitted to the additional requirements detailed in clause 3.
NOTE - Where lamphoiders are used in luminaires, their maximum operating temperatures are specified in IEC 60598.
B15 denotes the cap/holder fit as defined by IEC 60061-1, sheet 7004-11 and IEC 60061-2, sheet 7005-16 with the corresponding gauges.
B22 denotes the cap/holder fit as defined by IEC 60061-1, sheet 7004-10 and IEC 60061-2, sheet 7005-10 with the corresponding gauges.