Bayonet lampholders

This 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 EN 60598. 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.