Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:24v:p1
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 24V (pt 1/2)
Character Range: 52961–56575

24V  1.8d  6.2

d = diameter of filament
The first turn of the filament must lie entirely within the limits shown in view "A". The transverse projection of the filament must lie within the limits shown in view "B"; z'-z' is a plane perpendicular to the reference plane, parallel to and on the same side as the z-z line and at a distance "c" from the reference axis. The beginning of the filament as defined will be between b1 and b2. The last turn of the filament */ will be within the limits shown in view "C".

*/ as defined on sheet H3/4, footnote 7.

CATEGORY H3

Sheet H4/1

(Dimensions in mm)
The drawings are not mandatory; their sole purpose is to show which dimensions must be verified.
Reference  Dimension        Tolerance
           12 V             24 V       12 V    24 V
e          28.5             29.0       + 0.45  +/- 0.35
                                       - 0.25
p          28.95            29.25      -       -
m 1/       max. 60.0        -
n 1/       max. 34.5        -
s 2/       45.0             -
    3      max. 40 degrees  -
    alpha

    1/ Where a yellow outer bulb is used, "m" and "n" denote the maximum dimensions of this bulb; where there is no outer bulb, "m" denotes the maximum length of the lamp.
2/ It must be possible to insert the lamp into a cylinder of diameter "s" concentric with the reference axis and limited at one end by a plane parallel to and 20mm distant from the reference plane and at the other end by a hemisphere of radius s/2.
3/ The obscuration must extend at least as far as the cylindrical part of the bulb. It must also overlap the internal shield when the latter is viewed in a direction perpendicular to the reference axis. The effect sought by obscuration may also be achieved by other means.

CATEGORY H4

Sheet H4/2

Characteristics
Filament lamps of normal production                                   Standard filament
                                                                      lamp

 Rated                                                                   V                     12         24        12
 values                                                                  W                60 4/      55       75 4/     70     60 4/        55
 Test voltage                                                            V                     13.2       28
Objective                                                                W                max.       max.     max.      max.   max. 75   max. 68
values                                                                                    75         68       85        80     at 13.2   at 13.2V

                                                                      Luminous            1,650      1,000    1,900     1,200
                                                                      flux lm

                                                                      +/- %               15
Measuring
luminous flux                                                            lm                          750                800
according to
para. 3.8. of
this Regulation

 Reference luminous flux at approximately 12Vlm                       1,250                  750
 Cap P43t-38 in accordance with IEC Publication 61 (sheet 7004-39-5)

         4/ The values indicated in the left-hand column relate to the driving beam. Those indicated in the right-hand column relate to the passing beam.
CATEGORY H4

Sheet H4/3

Position of shield */

*/ The drawing is not mandatory with respect to the design of the shield.
** 30.0 for the 14V type.
CATEGORY H4

Sheet