flooding. Following these routes also makes it difficultto deliver materials.6. Avoid disrupting the environment. Taking intoconsideration environmental codes and regulations, theengineer should select routes that cause the leastdisturbance to the environment. The engineer shouldalso consider aesthetics when reviewing possible routes.ELECTRICAL DISTRIBUTIONDRAWINGSThe following text discusses the types of electricaldistribution drawings that you may prepare when youare assisting the engineering officer in a constructionbattalion or when assigned to the engineering divisionof a public works department.Electrical Distribution PlansThe type and extent of information placed on anelectrical distribution plan depends on the purpose of theplan. Figure 2-14 is a distribution plan for a Navyactivity that is taken from that activity’s master plan. Asyou can see, it shows the routes of the distributioncircuits, but it only identifies them as aboveground orbelowground. For this plan, you would find a briefnarrative description of the circuits located in the text ofthe master plan.Obviously, a drawing of the type shown in figure2-14 is of little use to an engineer or lineman whorequires specific information about the distributionsystem. For this purpose, you should prepare a detailedelectrical distribution plan. The detailed plan is drawnusing the proper electrical symbols found in ANSIY32.9. Similar to figure 2-14, the detailed plan showsall buildings and facilities and the routing of thedistribution lines. In addition and as applicable to thetype of system you are drawing, you also should includethe following information:1. The source of power (power plant, publicutility line, substation, or standby generator withelectrical data).2. The number, type, and size of undergroundconduit or cable ducts and the size, number, voltage, andtype of cable.3. Where cable runs are made without installedducts, indicate the location, dimensions, and descriptionof splice boxes.2-114. Identify and describe all electrical manholesand handholes by location, identification number, type,dimensions, and top and invert elevations.5. Describe all transformer vaults, either above-ground or belowground, with dimensions, top and invertelevations, numbers, type, and electrical data.6. Electrical data for all substations.7. The locationswitches.8. The number,overhead conductors.9. The location,and height of all poles.and type of all sectionalizingsize, type, and voltage of allidentification, material, class,10. The number and rating of all pole-mountedtransformers.11. Street-lighting systems, light standards, type,and rating of lights.12. The number, size, voltage, and type of street-lighting circuits.13. Note any buildings containing street-lightingtransformers and control equipment together with typeand rating of transformers.To simplify the drawing, it is common practice toplace much of the above information in appropriateschedules. For example, in an overhead distributionplan, you need only show the location and identificationnumber of the poles on the plan. The material, class, andheight of the poles can be placed in a pole schedule thatis listed by the pole identification numbers.Site PlansSite plans are discussed in the EA3 TRAMAN. Asyou should recall from your study of that trainingmanual, a site plan furnishes the essential data forlaying out a proposed facility. It shows propertyboundaries, contours, roads, sidewalks, existing andproposed buildings or structures, references, andother significant physical features, such as existingutility lines. For small, uncomplicated buildings, youcan often show all proposed electrical and other newutility lines on the same site plan. For the averagefacility, however, it is common practice to prepareseparate utility plans that are included, as applicable,in the plumbing and electrical divisions of a set ofproject plans.
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