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The type 25 plug and socket has 3 rectangular pins, 4 mm x 5 mm, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 16 A, 250 V/440 V. The socket will accept types 11, 12, 21, and 23 single phase plugs, the Europlug, and types 15 and 25 three phase plugs. Swiss multi-phased sockets
Green-yellow (middle): protective conductor Brown (right): phase conductor. SN 441011, until 2019 SEV 1011, [1] is the Swiss national standard for AC power plug for domestic use and similar purposes. The plug SN 441011 Type 12 and the socket SN 441011 Type 13 are also known internationally as Type J, and fits in all Swiss sockets. [2]
A conceptually similar (but incompatible) plug exists in Switzerland as SN 441011 type 15 (10 A) and type 25 (16 A). In France, instead of Perilex, NF C 61-315 was used. NF C 61-315 provides single & multiple phases for rating up to 32 A. Several plug & socket profiles exist to match the phases number and the various rating.
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]
The most common ratings are 16 A, 32 A and 63 A, with 125 A less common. Construction sites in central Europe have most of their higher power cabling setup with this three phase socket type as the single phase to neutral voltage of 230 V is available for other devices. So called power splitters with this connector as a 3 phase inlet and 3 ...
At low voltage electricity may be supplied by the distributor (DNO) as either single or three phase. A single phase supply will comprise a single line conductor and a neutral conductor. A three phase supply will comprise three line conductors each pair with a phase separation of 120 degrees and (optionally) a neutral conductor.
The earliest standardized method of wiring in buildings, in common use in North America from about 1880 to the 1930s, was knob and tube (K&T) wiring: single conductors were run through cavities between the structural members in walls and ceilings, with ceramic tubes forming protective channels through joists and ceramic knobs attached to the ...
The third phase, the "high leg" of the system (also referred to as the "wild leg"), has 208 V to neutral and is not usually used for single-phase connections, so is distinctively colored. For larger commercial installations, 277/480 V or 347/600 V three-phase is common. [citation needed]