This outlet is CE-approved and certified according to the German VDE norm

where it has been installed since the theater—then also operating as a movie theater—opened in 1928

) to the center of the light bulb

you need a Ceiling Cord DCL

Ringklockeknapp - Mässing Tillflager This outlet is CE-approved andLength: 68 mm (2. 68 in.) Width: 25 mm (0. 98 in.) Depth (including button): 23 mm (0. 91 in.) Center to center between screw holes (c c): approx. 40 mm (1. 57 in.) The back builds 20 mm (0. 78 in.) into the wall door, and a hole with a diameter of at least 19 mm (0. 75 in.) is required behind the push button. Two brass screws for the mounting are included. Used together with a doorbell and doorbell transformer for a complete installation. Doorbell