Obviously, a drawing of the type shown in figure 2-14 is of little use to an engineer or lineman who requires specific information about the distribution system. For this purpose, you should prepare a detailed electrical distribution plan. The detailed plan is drawn using the proper electrical symbols found in ANSI Y32.9. Similar to figure 2-14, the detailed plan shows all buildings and facilities and the routing of the distribution lines. In addition and as applicable to the type of system you are drawing, you also should include the following information:

1. The source of power (power plant, public utility line, substation, or standby generator with electrical data).

2. The number, type, and size of underground conduit or cable ducts and the size, number, voltage, and type of cable.

3. Where cable runs are made without installed ducts, indicate the location, dimensions, and description of splice boxes.

4. Identify and describe all electrical manholes and 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 invert elevations, numbers, type, and electrical data.

10. The number and rating of all pole-mounted transformers.

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-lighting transformers and control equipment together with type and rating of transformers.

To simplify the drawing, it is common practice to place much of the above information in appropriate schedules. For example, in an overhead distribution plan, you need only show the location and identification number of the poles on the plan. The material, class, and height of the poles can be placed in a pole schedule that is listed by the pole identification numbers.

Site plans are discussed in the EA3 TRAMAN. As you should recall from your study of that training manual, a site plan furnishes the essential data for laying out a proposed facility. It shows property boundaries, contours, roads, sidewalks, existing and proposed buildings or structures, References, and other significant physical features, such as existing utility lines. For small, uncomplicated buildings, you can often show all proposed electrical and other new utility lines on the same site plan. For the average facility, however, it is common practice to prepare separate utility plans that are included, as applicable, in the plumbing and electrical divisions of a set of project plans.

Figure 2-15.Electrical site plan.

Figure 2-15 shows a simple electrical site plan. This plan shows the routing of a new 13.8-kilovolt (kV) primary service line to a new dining facility. The new service is tapped to an existing 13.8-kV overhead primary feeder, runs down existing pole Number 126, and then runs underground to a new pad-mounted 75-kilovoltampere (kVA) transformer located next to the new facility.

Although a competent Construction Electrician or contractor could install this new service line from only the site plan, as shown in figure 2-15, he would have to prepare additional drawings or sketches to show his workmen the specific details of the construction. Therefore, to provide a better description of the installation, the electrical designer prepares additional electrical details.