What are the different voltage classifications for overhead power lines?
2025-08-13The electrical industry classifies power lines into several voltage ranges, each with a specific function in the electrical grid:
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Low Voltage (LV): Typically less than 1,000 volts. This is the final stage of distribution, used for connecting to residential and small commercial customers. The familiar lines running to your home are low voltage.
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Medium Voltage (MV): Ranging from 1 kV to around 69 kV. This is the primary distribution network, carrying power from substations to neighborhoods and industrial parks.
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High Voltage (HV): Ranging from 69 kV to 230 kV. This is the sub-transmission and transmission network, moving bulk power across regions and connecting large substations.
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Extra-High Voltage (EHV) and Ultra-High Voltage (UHV): Exceeding 230 kV. These lines are the "electrical highways" of the grid, used for long-distance, large-scale power transmission from generating stations to major substations.