Low voltage
Where two voltages are given below separated by "/", the first is the root-mean-square voltage between a phase and the neutral connector, whereas the second is the corresponding root-mean-square voltage between two phases (exception: the category shown below called "One Phase", where 240 V is the root-mean-square voltage between the two legs of a split phase). The three-phase voltages are for use in either four-wire (with neutral) or three-wire (without neutral) systems.Three-phase 50 Hz
* 230 V / 400 V (formerly 220/380 V) * 400 V / 690 V (formerly 380/660 V) * 1000 V phase to phase (3 wire) Suppliers using 220 V / 380 V or 240 V / 415 V systems were expected by the standard to migrate to the recommended value of 230 V / 400 V by the year 2003. This migration has already been largely completed, at least within the European Union.Voltage conversion schedule
Three-phase 60 Hz
* 120 V / 208 V * 240 V * 230 V / 400 V * 277 V / 480 V * 480 V * 347 V / 600 V * 600 V / 1000 VOne-phase, three-wire 60 Hz (American split-phase)
* 120 V / 240 VTable 3 1 kV to 35 kV
Table 3 of IEC 60038 lists nominal voltages above 1 kV and not exceeding 35 kV. There are two series, one from 3 kV up to 35 kVTable 4 35 kV - 230 kV
Table 4 shows nominal voltages above 35 kV and not exceeding 230 kV.Table 5 245 - 1,200 kV
Table 5 is systematically different, as the highest voltage for equipment is the characteristic value exceeding 245 kV. The enumeration begins at 300 kV and ends with 1200 kV.See also
* Mains electricity by countryReferences
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