6, 2243, Nov. 1998) 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).
For IEC low voltage is less than 1000 V and high voltage is above 1000 V. Ultra High Voltage (UHV) is commonly accepted as the voltage level above 1000 kV. Low Voltage - upto 1000V Medium Voltage - 1000V to 35kV High Voltage - 35kV to 230 kV Extra High Voltage - above 230 kV. Voltages Divided into Classifications High (HV), Extra- High (EHV) & Ultra-High Voltages (UHV) - 115,000 to 1,100,000 VAC Medium Voltage (MV) - 2,400 to 69,000 VAC Low Voltage (LV) - 240 to 600 VAC (IEEE Trans Power App. I would now be tempted to classify 'Low Voltage' as less than 1 kV, 'Medium Voltage' as above 1 kV to 35 kV and 'High Voltage' as 35 kV to 230 kV (with ultra high or extra high above 230 kV). In some situations, the term Ultra High Voltage is used to denote voltages above 800 kV. Typically, the voltage level between the … The three-phase voltages are for use in either four-wire (with neutral) or three-wire (without neutral) systems. Working on or above 600V to 69 kV industrial high voltage distribution systems requires qualification. 12 In the automotive industry, high-voltage refers to voltages above 60 V. The classifica- tion of voltages in extra-low, low, medium, high and extra-high voltage has its origins in plant and building services engineering, which is particularly evident in the detailed description of earthing and isolation condi- tions. Feedback, comments or further insight into this is welcome. This classification system is fast gaining acceptance. For instance, in the US there is not a consensus among, NEC, IEEE, utilities and consumers. Also offered as a Train the Trainer class. Sys PAS-97, no.
In this training, attendees learn what it means to be HV qualified and what electrical tasks may only be performed by a qualified person. The extra high voltages will be added as per the consumer requirement.
The standard didn't answer the original question, but it did provide useful background. Also the transmission line carries the high voltages is called high voltage transmission lines. The numerical definition of high voltage depends on context. The definitions may refer to the voltage between two conductors of a system, or between any conductor and ground. Two factors considered in classifying a voltage as high voltage are the possibility of causing a spark in air, and the danger of electric shock by contact or proximity.
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