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Normal Allocation of Voltage Drop. basis. Voltage control is used where objectionable voltage changes occur with varying voltages. Current control is used when loads change, but voltage is well regulated or load power factor remains substantially constant. Current control is effective also when power factor varies in a predictable manner with the load. Kilovar control is used when load voltage is regulated, but power factor varies in an unpredictable manner to corresponding load variations. More sophisticated current and voltage control than that covered by IEEE Std 18 can be provided, and manufacturers should be consulted for application and specification information.

Interfere with crane-type, materialshandling equipment). (3) Where aerial lines would interfere with high-frequency communication or electronic equipment. Aerial lines will not be within 250 feet of Communications-Electronic-Meterological (CEM) Operation Buildings, not within 1,500 feet of receiving antennas, and not within 1,000 feet of other antennas. (4) Where aerial installations would conflict with current policy for Family Housing Areas. (5) Where areas have such high load densities that underground electric lines are economical.

For maximum efficiencies, capacitor equipment will be located as close to the load controlled as is feasible. Surge arresters will be specified to limit the magnitude of voltage surges caused by capacitor switching. Applications of surge arresters will be in accordance with the IEEE C62 series of standards. c. Capacitor control. Switched capacitors will be provided only when differences between full-load and light-load power factors warrant such control. The load and power factor profile of the system will determine the economics of switched control, and whether there is a necessity for more than one switching step.

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