Today’s expanding overhead distribution systems are characterized by greater load densities resulting in more load per mile of line, more interconnections, and more laterals and branches. At the same time, there has been an increasing demand for an even higher degree of system reliability. To simplify switching procedures, minimize the scope of outages, and facilitate post-outage cold-load pickup, more and more sectionalizing points are being used. Since sectionalizing practices impose duties beyond the capabilities of ordinary disconnects, interrupter switches have increasingly become the appropriate device for most overhead distribution feeder applications.

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