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Three-phase electric power transmission lines Three-phase transformer (Békéscsaba, Hungary): On the left are the primary wires, and on the right are the secondary wires. In a symmetric three-phase power supply system, three conductors each carry an alternating current of the same frequency and voltage amplitude relative to a common reference ...
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
Since some wiring may be reversed, which would make motors turn backward, many machines on construction sites feature a phase swap plug that allows the L2 and L3 phase pins to be swapped, thereby reversing the phase sequence. Three-phase electric motors do not need the neutral wire to function, so that there is also a red four pin variant (3 ...
Lighting and general purpose receptacles are at 120 volts AC, with larger devices fed by three wire single-phase circuits at 240 volts. In commercial construction, three-phase circuits are often used. Common 3 phase configurations within a building are 208v/120 wye, 120/240 center tapped delta and 480v/277v wye. Lighting is usually fed by 277 V ...
The 16 A version is DIN 49445 (socket) and DIN 49446 (plug) and the 25 A version is DIN 49447 (socket) and DIN 49448 (plug). For indoor use at max 25A, it replaced an earlier (interwar period) flat oval-shaped 4-pin connector (3 phases and protective earth) that was standardized in DIN 49450 / DIN 49451. [1] for up to 100A.
In Europe, three-phase 230/400 V is most commonly used. However, 130/225 V, three-wire, two-phase electric power discontinued systems called B1 are used to run old installations in small groups of houses when only two of the three-phase high-voltage conductors are used. The phase shift in Europe is 120°, as is the case with three-phase current.
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