Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:15:p1
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 15 (pt 1/2)
Character Range: 66105–70323

15

Reference luminous flux: 460lm at approximately 13.5V

    1/ Maximum lateral deviation of filament centre from two reciprocally perpendicular planes both containing the
reference axis of cap and one containing axis of pins.
    2/ Lamps with cap BA 15d may be used for special purposes; they have the same dimensions.
3/ To be checked by means of a "box system", sheet P21W/2
    4/ For 24V heavy-duty lamps having a different filament shape, additional specifications are under consideration.
CATEGORY P21W

Sheet P21W/2
Screen projection requirements
This test is used to determine, by checking whether the filament is correctly positioned relatively to the reference axis and the reference plane and has an axis perpendicular, within +/- 15 degrees, to the plane through the centres of the pins and the reference axis, whether a filament lamp complies with the requirements.

Dimensions in mm
reference  a    b    h    k
dimension  3.5  3.0  9.0  1.0

Test procedure and requirements.
      1. The lamp is placed in a holder (socket) 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 should be obtained within the angular-displacement tolerance limits (+/- 15 degrees).

2.                   Side elevation
    The lamp being placed with the cap down, the reference axis vertical, and the filament seen end-on, the projection of the filament should 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 lamp being placed with the cap down and the reference axis vertical, the lamp being viewed in a direction at right angles to the filament axis:

    3.1. the projection of the filament should lie entirely within a rectangle of height "a" and width "h" centred on the theoretical position of the centre of the filament; and

    3.2. the centre of the filament should not be offset by more than the distance "k" from the
    reference axis.
CATEGORY P21/4W
Sheet P21/4W/1

a)      Main (high-wattage) filament
b)     Auxiliary (low-wattage) filament

Dimensions in mm                                                                                        Standard
                   Lamps of                                                                             filament
                   normal production                                                                    lamp

min.               nom.                                                                  max.
                   e                                                                                      31.8 1/                                          31.8 +/- 0.3
                   f                                                                                                   7.0             1/                  7.0           +0
                                                                                                                                                                         -2
Lateral deviation                                                                                       1/                               0.3 max. 2/

                   x, y                                                                  1/                              2.8 +/- 0.5

                   beta                                                                  75 degrees 1/  90 degrees 1/  105 degrees 1/  90 degrees +/- 5
                                                                                                                                       degrees
                   Cap BAZ 15d in accordance with IEC Publication 61 (sheet 7004-11C-1)
                   ELECTRICAL AND PHOTOMETRIC CHARACTERISTICS
Rated values                                                                                 V          12             24                                12

    W