What term is used to refer to distribution circuits greater than 600 volts up to 69,000 volts?

The term that refers to distribution circuits greater than 600 volts up to 69,000 volts is "primaries." In electrical distribution systems, primary circuits are responsible for carrying high-voltage electricity from substations to distribution points. These circuits serve as the backbone of the electrical distribution network, ensuring that electricity is transmitted efficiently and reliably over long distances.

Primaries are distinct from secondaries, which operate at lower voltage levels and branch out to deliver electricity directly to consumers. Substations are points where voltage is stepped down from high transmission levels to lower distribution levels, while feeders are the lines that take power from substations to various distribution points but may sometimes not reach the higher voltage thresholds of primary circuits. Thus, "primaries" is the correct term for those high-voltage distribution circuits.