What voltage classification defines Extra High Voltage?

Extra High Voltage (EHV) is classified as voltage levels that start at 345 kV and above, which aligns with widely accepted standards in the electric power industry. This classification is crucial for the efficient transmission of electricity over long distances, as higher voltages reduce the amount of energy lost to resistance in the transmission lines. With EHV systems, utilities can minimize losses and increase the capacity of the transmission network. This classification also affects design considerations, insulation requirements, and safety regulations associated with the operation and maintenance of electrical infrastructure, all of which are structured around the 345 kV threshold for EHV.

Lower classifications, such as those that start at 300 kV, 250 kV, or 400 kV do not encompass the standard definition of extra high voltage, as they either fall below the commonly accepted threshold or do not align with regulatory definitions used for planning and operational standards in the industry.