Final answer:
Voltages 69,000 to 230,000 are classified as subtransmission or high voltages, which are used for long-distance electricity transmission and are reduced to lower voltages for safe consumer use.
Step-by-step explanation:
Voltages 69,000 to 230,000 are classified as subtransmission or high voltages. These levels of voltage are used for transmitting electrical power over long distances to limit energy losses and are stepped down to much lower values for safe use in residential and commercial buildings. Transformers play a key role in changing the voltages at several points in a power distribution system. Electric power is generally generated at a voltage greater than 10 kV and can be transmitted at voltages from 120 kV to 700 kV. When the power reaches local neighborhoods or industries, it is stepped down to voltages ranging from 5 to 13 kV, and further reduced to 120, 240, or 480 V for consumer use.