RMP Underground Conduit System Installation Guide (Procedure 242)

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2.2.7 Conduit ProofingAll underground runs shall be proofed with a mandrel to removeobstructions, and to confirm at least 80 percent of the nominal conduitdiameter. When requested by the Power Company, the customer shallperform a Power Company witnessed proofing of conduit systems. SeeTable 2.2.7, Required Mandrel Sizes for Conduit Proofing and Figure 2.2.7.ProcedureTable 2.2.7 – Required Mandrel Sizes for Conduit ProofingConduitNominalDiameter(in.)MandrelDiameter(in.)MinimumMandrelLength(in.)MaximumMandrelLength(in.) Proof (%)2 1.62 2.4 6 813 2.5 3.25 8 834 3.5 4.25 8 876 5.5 6.25 10 923” Mandrel2.5” Diameter4” Mandrel3.5” Diameter6” Mandrel5.5” DiameterFigure 2.2.7 – Typical Mandrels2.2.8 Change in Conduit SizeNo change in conduit size within a conduit run is allowed.2.2.9 Conduit to Existing EquipmentWhen the customer is installing conduit to existing (energized) equipment,the customer shall stop installation of the conduit two feet from the PowerCompany facility, unless otherwise requested by the Power Company. TheJ:\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. 8
customer shall provide a sweep and extra conduit for use by PowerCompany employees.2.2.10 Conduit to New Equipment BasesWhen the customer is installing conduit to new padvaults, flat pads, padboxes, secondary boxes, or secondary pedestals, it shall be done accordingto Sections 8 - 13 of this document.2.2.11 Conduit through PavementWhen conduit extends vertically through a paved or concrete surface, asleeve shall be placed around the conduit to prevent direct contact with thepavement. This helps prevent damage to conductors caused by groundmovement.2.2.12 EasementsThe customer must ensure all conduits are placed within the Public UtilityEasement (PUE) or within the limits of the granted Right of Way for RockyMountain Power.2.3 Trench and Backfill Requirements2.3.1 Call Before You Dig (811)State laws require the customer or excavator to call for underground utilitylocations. Excavation may not be started until locations have been markedor the utilities have informed the excavator there are no facilities in the area.Notify the local underground locating services (811) before you dig.2.3.2 Trenching RequirementsThe customer shall provide all trenching. OSHA requires the trench beshored when the combination of trench plus the spoil exceeds five feet. Tocomply with OSHA rules when not shoring a trench, the customer shall keepthe spoil at least two feet away from the open trench.The National Electrical Safety Code (NESC) states in section 321.A, “Thebottom of the trench should be undisturbed, tamped, or relatively smoothearth. Where the excavation is in rock, the conduit should be laid on aprotective layer of clean tamped backfill.”To the extent possible, trench bottoms shall be level and made of welltampedearth without sharp rises and drops in elevation. Rock spurs orridges shall not project into the trench. If trenching is left open overnight, thecustomer is responsible for cleaning prior to conduit installation. Per NESC321.A. the Power Company may require the conduit be laid on a protectivelayer of clean tamped backfill.2.3.3 Backfill RequirementsThe National Electrical Safety Code states in section 321.B, “All backfillshould be free of materials that may damage the conduit system.RECOMMENDATION: Backfill within 150 mm (6 in) of the conduit should befree of solid material greater than 100 mm (4 in) in maximum dimension orwith sharp edges likely to damage it. The balance of backfill should be freeof solid material greater than 200 mm (8 in) in maximum dimension. Backfillmaterial should be adequately compacted.”ProcedureJ:\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. 9
Page 3: ProcedureUnderground Conduit System
Page 7 and 8: Figure 6.5.2 - Joint Use Separation
Page 9 and 10: Underground Conduit Systemsfor Prim
Page 12 and 13: Any conduit system or any part of a
Page 14 and 15: ProcedureFiberglass conduit and swe
Page 18 and 19: The following list of requirements
Page 20 and 21: ProcedureFigure 2.3.6.1 - Joint Use
Page 22: A padvault is a two-part concrete b
Page 25 and 26: 3.4 Secondary BoxesSecondary boxes,
Page 27 and 28: ProcedureFigure 4.2 - Clearances be
Page 29 and 30: Company is required to return to th
Page 31 and 32: 6 Installation Guidelines - Conduit
Page 33 and 34: 6.3 Installing Conduit through Pave
Page 35 and 36: 6.5 Joint Use SeparationFor joint u
Page 37 and 38: 6.6 Transition from Overhead to Und
Page 39 and 40: • Site accessibility. The site lo
Page 41 and 42: ProcedureFigure 7.6.1 - Barrier Pos
Page 43 and 44: 8 Three Phase Sectionalizing Cabine
Page 45 and 46: Notes:For each conduit run:•One 4
Page 47 and 48: Notes:For each conduit run:•Leave
Page 49 and 50: 9.2 Excavation - Single Phase Secti
Page 51 and 52: 3” Final Grade6-10”3 - 6”45°
Page 53: ProcedureFigure 10 - Single Phase T
Page 57 and 58: 10.4 Power Company Installs Pad Box
Page 59 and 60: 11.2 Excavation - Secondary BoxNote
Page 61 and 62: 12 Concrete Flat Pads - Customer Re
Page 63 and 64: 12.2 Excavation, Flat Pad - Three P
Page 65 and 66: ProcedureFigure 13.1 - Padvault13.2
Page 67 and 68:
Pad vault must be set at proper ele
Page 69:
UG CONDUIT SYSTEMS Rev. 6 May 2014E
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RMP Underground Conduit System Installation Guide (Procedure 242)

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