WHAT YOU SHOULD KNOW ABOUT USING CONDUITS IN POWER SUBSTATION DESIGNS There are several locations where conduit is used in power substation designs. The most common one considered is conduit used to provide cable access to equipment, such as breakers, transformers, instrument transformers, and motor-operated disconnect switches located in the yard of the substation. Conduit can be a means by which direct buried cable gets from the ground to the equipment, or it can be run directly to cable trenches, manholes, or to the electrical equipment enclosure. Conduit is also used to run the wiring within the electrical equipment enclosure. Utilization wiring would include AC power cable used for lighting receptacles and HVAC. These uses of conduit are in all substations and have a straightforward application of the NEC. Another application of conduit in the substation is for the protection of medium-voltage circuits. Examples of these circuits include distribution cable leaving the substation and wind farm collector circuits entering the substation. This application of conduits results in some design challenges when applying the NEC.
Posted on: Fri, 25 Jul 2014 05:12:26 +0000
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