RMP Underground Conduit System Installation Guide (Procedure 242)

List of FiguresFigure 1.3.1 – Primary, Secondary, and Service Conductor Schematic ....................................... 2Figure 1.3.2 – Typical Primary and Secondary Equipment ........................................................... 3Figure 2.2.5.1 – Fiberglass Conduit .............................................................................................. 6Figure 2.2.5.2 – Electrical Grade PVC .......................................................................................... 6Figure 2.2.5.3 – Fiberglass Sweeps ............................................................................................. 6Figure 2.2.6.1 – Fiberglass End Connections ............................................................................... 7Figure 2.2.6.2 – Field Altered Sweep - Damaged PVC ................................................................ 7Figure 2.2.7 – Typical Mandrels .................................................................................................... 8Figure 2.3.4 – Primary Trench .................................................................................................... 10Figure 2.3.5 – Secondary Trench ............................................................................................... 11Figure 2.3.6.1 – Joint Use Secondary Trench ............................................................................ 12Figure 2.3.6.2 – Joint Use Primary Trench ................................................................................. 12Figure 3.1.1 – 32” Fiberglass Pad Box ....................................................................................... 13Figure 3.1.2 – Pad Box Installation ............................................................................................. 13Figure 3.2.1 – Typical Padvault .................................................................................................. 14Figure 3.2.2 – Typical Padvault Installation ................................................................................ 14Figure 3.3.1 – Three-Phase Transformer on a Flat Pad ............................................................. 15Figure 3.3.2 –Flat Pad Installation Specifications ....................................................................... 16Figure 3.4.1 – Secondary Box with Pedestal .............................................................................. 17Figure 3.4.2 – Installed Secondary Box with Pedestal ................................................................ 17Figure 4.1 – Working Clearances to Pad-mounted Equipment ................................................... 18Figure 4.2 – Clearances between Oil Filled Equipment (Transformers) and Structures ............. 19Figure 4.3 – Typical Firewall ....................................................................................................... 20Figure 5.1.1 – Typical Primary Conductor Trench ...................................................................... 21Figure 5.1.2 – Typical Conductor Trench .................................................................................... 22Figure 5.2.1 – Acceptable Backfill ............................................................................................... 22Figure 5.2.2 – Unacceptable Backfill .......................................................................................... 22Figure 6.1.1 – Applying Glue to Conduit ..................................................................................... 23Figure 6.1.2 – Seating the Conduit ............................................................................................. 24Figure 6.2 – Installing Conduit to Existing (Energized) Equipment ............................................. 24Figure 6.3 – Installing Conduit through Concrete ....................................................................... 25Figure 6.4.1 – Conduit Plug and Pull Line .................................................................................. 25Figure 6.4.2 – Conduit Proofing .................................................................................................. 26Figure 6.4.3 – Plugging the Conduit ........................................................................................... 26ProcedureJ:\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.iii