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Some modern hotels have 220 V sockets for European 2-pin plugs (Type C). [25] Curaçao: A, [26] B, F [27] 127 V [26] [28] 220 V 380 V 50 Hz [26] Some hotels and apartments have 220 V European sockets. [29] Cyprus: G 240 V 415 V 50 Hz Czech Republic: C, E ČSN 35 4516 230 V 400 V 50 Hz Denmark: C E, F, K DS/EN 50075 DS 60884-2-D1 [30] 230 V 400 V
In this system a 240 V supply has a centre-tapped neutral to give two 120 V supplies which can also supply 240 V to loads connected between the two line wires. Three-phase systems can be connected to give various combinations of voltage, suitable for use by different classes of equipment.
Split-phase distribution is used on Amtrak's 60 Hz traction power system in the Northeast Corridor between New York and Boston. Two separate wires are run along the track, the contact wire for the locomotive and an electrically separate feeder wire. Each wire is fed with 25 kV with respect to ground, with 50 kV between them.
This allows one to choose single-phase AC power at either 110–120 volts between phase and neutral or 220–240 volts between phase and phase. Since these two modes do not need three phases there is also a dark yellow-orange four-pin connector available designed for a single-phase 110–120 or 220–240 volt load.
Two-phase power can be derived from a three-phase source using two transformers in a Scott connection: One transformer primary is connected across two phases of the supply. The second transformer is connected to a center-tap of the first transformer, and is wound for 86.6% of the phase-to-phase voltage on the three-phase system.
This gives a phase-to-phase voltage of 400 volts wye service and a single-phase voltage of 230 volts between any one phase and neutral. In the UK a typical urban or suburban low-voltage substation would normally be rated between 150 kVA and 1 MVA and supply a whole neighbourhood of a few hundred houses.
The phase angle difference between voltage and current of each phase is not necessarily 0 and depends on the type of load impedance, Z y. Inductive and capacitive loads will cause current to either lag or lead the voltage. However, the relative phase angle between each pair of lines (1 to 2, 2 to 3, and 3 to 1) will still be −120°.
AS/NZS 3112 compliant plugs have two flat pins forming an inverted V-shape plus a vertical earthing pin. The flat blades measure 6.35 by 1.6 mm ( 1 ⁄ 4 by 1 ⁄ 16 in) with the active (line) and neutral pins 17.35 mm ( 11 ⁄ 16 in) long set 30° to the vertical and the vertical earth pin being 20 mm (0.787 in) in length. [ 15 ]