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Closed busways include split-phase closed busbars, co-box (including co-box phase partition) closed busbars and cable busbars, which are widely used in power plants, substations, industrial and civil power conductors.
The larger the cross-section of the conductive copper bar in a closed busway, the smaller the power loss, but the line investment, maintenance and management, and non-ferrous metal consumption will also increase accordingly.