Describes requirements for the following types of reactors: shunt reactors; series reactors including current-limiting reactors, neutral-earthing reactors, power flow control reactors, motor starting reactors, arc-furnace series reactors; filter (tuning) reactors; capacitor damping reactors; capacitor discharge reactors; earthing transformers (neutral couplers); arc-suppression reactors; smoothing reactors for HVDC and industrial application; with the exception of the following reactors: reactors with a rating less than 1 kvar single-phase and 5 kvar three-phase; reactors for special purposes such as high-frequency line traps or reactors mounted on rolling stock.