Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:6:p8
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 6 (pt 8/9)
Character Range: 256003–260103

read:

CATEGORY WY21W

Sheet WY21W/1

DIMENSIONS in min

                                                                 min.                  nom.              max.
e                                                                                      29.0                               29.0+/-0.3
f                                                                                                        7.5              7.5                      +0
                                                                                                                                                   -2
Lateral deviation                                                                                        3/               0.3 max.
beta                                                             -15 degrees 3/        0 degrees         + 15 degrees 3/  0 degrees +/- 5 degrees
Cap WX 3x16d in accordance with IEC Publ. 61 (sheet 7004-105-2)
            ELECTRICAL AND PHOTOMETRIC CHARACTERISTICS
Rated values                                                     v                     12                                 12
                                                                 W                     21                                 21
Test voltage                                                     v                     13.5
                                                                 Watts                 W                 26.5 max.                                 26.5 max. at 13.5V
Objective values                                                                       lm                280
                                                                 Luminous flux
+/-                                                              20
%
Reference luminous flux:                                         Amber bulb : 280 lm   at approx. 13.5V
                                                                 Clear bulb : 460 lm

    1/ Maximum lateral deviation of filament centre from two mutually perpendicular planes both containing the reference axis and one containing t e axis X-X.
2/ The bulb of production lamps shall be amber. (See also note 4/)
3/ To be checked by means of a box system, sheet WY2 1 W/2.
    4/ The bulb of standard filament lamps shall be amber or clear. For amber standard filament lamps, changes of the bulb temperature shall not affect the luminous flux which might impair photometric measurements of signalling devices. Moreover the colour shall be in the lower part of the tolerance area.

CATEGORY WY21W

Sheet WY21W/2
Screen projection requirements

This test is used to determine, by checking whether the filament is correctly positioned relative to the reference axis and the reference plane and has an axis perpendicular, within +/-15 degrees , to the plane through the axis X-X and the reference axis, whether a filament lamp complies with the requirements.

Reference  a    b    h    k
Dimension  3.5  3.0  9.5  1.0

Test procedure and requirements.
     1. The filament lamp is placed in a holder capable of being rotated about its axis and having either a calibrated scale or fixed stops corresponding to the angular displacement tolerance limits, . i.e. +/-15 degrees. The holder is then so rotated that an end view of the filament is seen on the screen on to which the image of the filament is projected. The end view of the filament shall be obtained within the angular displacements tolerance limits. (+/-15 degrees)
     2. Side elevation
    The filament lamp placed with the cap down, the reference axis vertical and the filament seen end-on, the projection of the filament shall lie entirely within a rectangle of height "a" and width "b", having its centre at the theoretical position of the centre of the filament.
3.      Front elevation
    The filament lamp placed with the cap down and the reference axis vertical, the filament lamp being viewed in a direction at right angles to the filament axis:

       3.1.The projection of the filament shall lie entirely within a rectangle of height "a" and width "h",