RMP Underground Conduit System Installation Guide (Procedure 242)

4 Clearances, Firewalls, and Enclosed Spaces4.1 Working ClearancesThe Power Company needs working clearances to maintain equipment once it isinstalled. The customer shall comply with the distances shown in Figure 4.1.ProcedureWhere access is required on oneside of the equipment such astransformers and sectionalizingcabinetsWhere access is required on twosides of the equipment such asswitchgearNon-access side3’3’10’3’10’10’Access sideDistances are from the hinge onthe access door.Distances are from the hinges onthe access doors.4.2 National Code ClearancesWorking ClearancesFigure 4.1 – Working Clearances to Pad-mounted Equipment• Notes on Figure 4.1:• Depending on the base the customer may not know exactly wherethe equipment will sit on the equipment base. As a rule of thumbassume the clearances will be from the edge of the equipmentbase. If these rule of thumb clearances cannot be achieved, contactthe Power Company.• No vegetation other than grass shall be present in the clearworkspace.• Trip hazards such as gutters, spigots, etc., shall not exist within theclear workspace.• Curbs may be acceptable in the clear workspace; contact thePower Company during site scoping.National codes require minimum clearances to oil-filled equipment. Transformerscontain a mineral oil. Although all padmounted equipment does not contain oil, theclearances shown in Figure 4.2 and Table 4.2 are required for all padmountedequipment.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. 18