IEC62560 6.2 Bending moment and mass imparted by the lamp at the lamp holder

The value of the bending moment and mass, imparted by the lamp at the lampholder shall not exceed the value given in Table 2 or, where not given, the value in the system information on cap sheets specified in the IEC60061-1.

The bending moment shall be determined by measuring the weight of the lamp (e. g. by means of a balance) at the tip of the bulb of the horizontally held lamp and multiplying this force by the distance between the tip of the bulb and the pivot line. The pivot line shall lie at the bottom end of the cylindrical part (for Edison and bayonet caps) or at the end of the contact pins (for pin caps). It shall be supported by an upright held thin metal sheet or a similar means.

Table 2 – Bending moments and masses

u.c.: under consideration

NOTE 1 For lamps with caps different to those in Table 2, the effect of the bending moment should be regarded and limited. A measurement method for these lamps with these caps is under consideration.

NOTE 2 It should be taken care that the luminaire surface where the lampholder is fixed to can withstand the bending moment. For the calculation of this bending moment, the length of the lampholder needs to be taken into account when measuring the overall length. This should be made sure for the elevated temperature during operation in order to check the possible softening of the surface material.

NOTE 3 Requirements for lamps with additional mechanical fixation e.g. rim mounted lamps, is under consideration.

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