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: 76216–79395

15                                                             20                                                                    15                         20              15                             20

Reference luminous flux: 440lm at 35lm at approximately 13.5V

    1/ These dimensions should be checked by means of a "box system" (P21/5W/2, P21/5W/3) based on the dimensions and tolerances shown above. "x" and "y" refer to the main (high-wattage) filament, not to the lamp axis (P21/5W/2).Means of increasing the positioning accuracy of the filament and of the cap-holder assembly are under consideration.
    2/ Maximum lateral deviation of main (high-wattage) filament centre from two mutually perpendicular planes both containing reference axis and one containing axis of pins.
3/ The 24V filament lamp is not recommended for future embodiments.
CATEGORY P21/5W

Sheet P21/5W/2
Screen projection requirements
This test is used to determine, by checking whether:
(a)             the main (high-wattage) 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; and whether
               ()               the auxiliary (low-wattage) filament is correctly positioned relatively to the
               main (high-wattage) filament,
whether a filament lamp complies with the requirements. 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 main (high-wattage) filament is seen on the screen onto which the image of the filament is projected. The end view of the main (high-wattage) 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, the reference pin to the right and the main (high-wattage) filament seen end-on:

      2.1. the projection of the main (high-wattage) 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.

      2.2. the projection of the auxiliary (low-wattage) filament should lie entirely:

      2.2.1. within a rectangle of width "c" and height "d" having its centre at a distance "v" to the right of and at a distance "u" above the theoretical position of the centre of the main (high-wattage) filament;

      2.2.2. above a straight line tangential to the upper edge of the projection of the main (high- wattage) filament and rising from left to right at an angle of 25 degrees;

      2.2.3. to the right of the projection of the main (high-wattage) 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 axis