Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:12v:p2
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 12V (pt 2/3)
Character Range: 197688–201406

filament is projected. The end view of that filament shall be obtained within the angular displacement tolerance limits.

              2. Side elevation

The filament lamp placed with the cap down, the reference axis vertical, the reference key to the right and the major filament seen end-on:

            2.1. the projection of the major 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;
            2.2. the projection of the minor filament shall lie entirely within a rectangle of width "c" and height "d" having its centre at a distance "u" above the theoretical position of the centre of the major 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 axis of the major filament:
            3.1. the projection of the major filament shall lie entirely within a rectangle of height "a" and width "h", centred on the theoretical position of the centre of the filament;
            3.2. the centre of the major filament shall not be offset by more than distance "k" from the reference axis;
            3.3. the centre of the minor filament shall not be offset from the reference axis by more than +/- 2mm (+/- 0.4mm for standard lamps).
CATEGORY PY27/7W

Sheet PY27/7W/3

Reference  a    b    c    d    u
Dimension  3.5  3.0  4.8  5.1

Reference  a    h     k
Dimension  3.5  11.9  1.0

CATEGORY HIR2

Sheet HIR2/1
The drawings are only to illustrate the essential dimensions of the filament lamp

Dimensions in mm

    1/ The reference plane is the plane defined by the three meeting points of the cap- holder fit.
    2/ The reference axis is perpendicular to the reference plane and passes through the center of the reference diameter of the cap.
    3/ Glass bulb and supports shall not exceed the envelope. The envelope is concentric to the reference axis.
4/ The keyway is mandatory.
    5/ The filament lamp shall be rotated in the measuring holder until the reference lug contacts plane C of the holder.
    6/ Glass bulb periphery shall be optically distortion-free axially within the angles gamma1 and gamma2. This requirement applies to the whole bulb circumference within the angles gamma1 and gamma2.
CATEGORY HIR2

Sheet HIR2/2

Dimensions in mm
11/                                                            Tolerances

Filament lamps of normal                                       Standard filament lamp
production
e 8/ 10                                                        28.9                    9/       +/- 0.16
/                                                              5.3                     9/       +/- 0.16
f 8/ 10
/                                                                 0                    + 0.7    + 0.4
g 8/                                                                                   - 0.0    - 0.0

h1, h2                                                            0                    9/       +/- 0.15

d                                                              1.6 max                 -        7/
                                                                                                -
gamma1                                                         50 degrees              -        -
                                                               min.
gamma2                                                         50 degrees              -        -
                                                               min.
Cap PX 22d