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2. Edison screw - Wikipedia

   en.wikipedia.org/wiki/Edison_screw

   Edison screw (ES) is a standard lightbulb socket for electric light bulbs. It was developed by Thomas Edison (1847–1931), patented in 1881, [1] and was licensed in 1909 under General Electric's Mazda trademark. The bulbs have right-hand threaded metal bases (caps) which screw into

3. Lightbulb socket - Wikipedia

   en.wikipedia.org/wiki/Lightbulb_socket

   A lightbulb socket, lightbulb holder, light socket, lamp socket or lamp holder is a device which mechanically supports and provides electrical connections for a compatible electric lamp base. [1] Sockets allow lamps to be safely and conveniently replaced (re-lamping).

4. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   The pins of the secondary plug (which lacked insulation sleeves) could not be inserted into the cylindrical sockets completely, leaving a 5 mm gap between the primary and secondary plugs. The adaptors were mostly used for low power appliances (for example, connecting both a table lamp and a radio to a socket).

5. Talk:Edison screw - Wikipedia

   en.wikipedia.org/wiki/Talk:Edison_screw

   In North America, there are four standard sizes of screw-in sockets used for line-voltage lamps: candelabra (E12), intermediate (E17), medium or standard (E26), and mogul (E39). In continental Europe, these are instead slightly different: candelabra (E10 or E11), intermediate (E14), medium or standard (E27), and mogul (E40).

6. IEC 60309 - Wikipedia

   en.wikipedia.org/wiki/IEC_60309

   The maximum voltage allowed by the standard is 1000 V DC or AC; the maximum current, 800 A; and the maximum frequency, 500 Hz. The ambient temperature range is −25 °C to 40 °C. [3] There is a range of plugs and sockets of different sizes with differing numbers of pins, depending on the current supplied and number of phases accommodated.

7. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   Internationally, the NEMA 5-15P plug and NEMA 5-15R receptacle are the basis for the International Electrotechnical Commission's IEC 60906-2 standard IEC system of plugs and sockets-outlets for household and similar purposes – Part 2: Plugs and socket-outlets 15 A 125 V a.c. and 20 A 125 V a.c. [24]