RMP Underground Conduit System Installation Guide (Procedure 242)

Primary Conductors: Underground conductors between the Power Company’ssubstation and the Power Company’s distribution transformers. Depending on thearea, these conductors are energized between 4,200 volts and 34,500 volts.Secondary Conductors: Underground conductors between the Power Company’sdistribution transformers and secondary boxes. Depending on the customer’sapplication, these conductors are energized between 120 and 480 volts.Service Entrance Conductors: Underground conductors between the customer’sservice equipment terminals and the Power Company’s source (a distributiontransformer or a secondary box). For more information regarding service entranceconductors and conduit please refer to the Power Company’s Electric ServiceRequirements at www.rockymountainpower.net/con/esr.ProcedureFigure 1.3.1 – Primary, Secondary, and Service Conductor SchematicPrimary and Secondary Equipment Associated with Conduit SystemsDistribution Transformer: A voltage device that converts power from a primaryvoltage to a secondary voltage. The secondary side of the transformer is used toserve individual customers either directly or via a secondary box. See figure 1.3.1.Sectionalizing Cabinet (Ground Sleeve): A primary voltage device used as ajunction for two or more primary cables. A ground sleeve cannot be used to serve acustomer.Switchgear: A primary voltage device used as either a switch point or protectionpoint for two or more primary cables. Switchgear cannot be used to serve acustomer.J:\Publications\FPP\DIS\PRO\242-RMP Underground Conduit Systems.docx R6, 5/13/14This document is posted online at rockymountainpower.net, and at engineering’s intranet site for distribution procedures.Modification of this document must be authorized by PacifiCorp engineering publications, (503) 813-5293. 2