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Steel wire armoured cable, commonly abbreviated as SWA, is a hard-wearing power cable designed for the supply of mains electricity.t is one of a number of armoured electrical cables â which include 11kV Cable and 33kV Cable â and is found in underground systems, power networks and cable ducting.
Since, by definition, the cable tray is a passive element, this directive is therefore not applicable. Correctly connected to the earth network, however, the metal cable tray plays a positive role in the correct EMC of the installation.