IEC 60038
| IEC voltage range | AC | DC | defining risk |
|---|---|---|---|
| High voltage (supply system) | > 1000 Vrms | > 1500 V | electrical arcing |
| Low voltage (supply system) | 50–1000 Vrms | 120–1500 V | electrical shock |
| Extra-low voltage (supply system) | < 50 Vrms | < 120 V | low risk |
International Standard IEC 60038:1983 defines a set of standard voltages for use in low voltage and high voltage AC electricity supply systems.
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
- 400 V / 690 V
- 1000 V
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
| Year | Neutral-Phase [V] / Phase-Phase [V] | |
|---|---|---|
| — 1987 | 220 V / 380 V | – 10 % .. +10 % [1] |
| 1988 — 2003 | 230 V / 400 V | – 10 % .. + 6 % [1] |
| 2003 — | 230 V / 400 V | – 10 % .. +10 % [1] |
Three-phase 60 Hz
- 120 V / 208 V
- 240 V
- 277 V / 480 V
- 480 V
- 347 V / 600 V
- 600 V
One-phase, three-wire 60 Hz
- 120 V / 240 V
Medium voltage
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 kV and another one from 4,16 kV up to 34,5 kV.
High voltage
Table 4 shows nominal voltages above 35 kV and not exceeding 230 kV.
Extra-high voltage
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
External links
- Definition of Voltage ranges as per IEC 60038 – WIKI - Electrical Installation Guide