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This International Standard applies to bayonet lampholders 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 lampholders which are wholly or partly integral with a luminaire or intended to be built into appliances.
Independent lampholders, e.g. backplate lampholders, not specifically intended for building-in, are submitted to the additional requirements detailed in clause 3.
NOTE - Where lampholders are used in luminaires, their maximum operating temperatures are specified in IEC 598.
B15 denotes the cap/holder fit as defined by IEC 61-1, sheet 7004-11 and IEC 61-2, sheet 7005-16 with the corresponding gauges.
B22 denotes the cap/holder fit as defined by IEC 61-1, sheet 7004-10 and IEC 61-2, sheet 7005-10 with the corresponding gauges.
