Quantcast Types of Drawings and Diagrams

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A graphic symbol represents the function of a part in the circuit. Qualifying symbols may be added to symbols when the special characteristic is important to   the function of the device and aids in the understanding of the   overall   function   performed.   For   example, connection symbols shown in column 1 of figure 2-6 are headed "Qualifying Symbols." They are combined with transformer symbols shown further on in the figure. Some symbols may be similar or identical to other symbols but have different meanings. Only one meaning will apply to a specific symbol used on a diagram.  Notes,  asterisks,  and  flagging  techniques  may be  used  with  symbols  having  multiple  meanings.  A tabulation listing the intended meanings should be provided. Except where noted, the orientation of a symbol on a drawing does not alter the meaning of the symbol. FREEHAND SKETCHES When  installing  electrical  systems  and  circuits,  you will sometimes have to exchange information about your job with others. A freehand sketch can be an accurate  and  a  concise  way  to  communicate  this information. This type of drawing is informal in character, may or may not be drawn to scale, and need not follow any particular format. A sketch can be used in many ways. One example of where to use a sketch is to show a field change  that  must  be  made.  Nomatterhowwellaproject is planned, occasionally field changes have to be made. You may see that a field change is necessary because a conduit run cannot practically be routed according to the approved drawing or plan. You can make a freehand sketch showing only what has to be changed. The sketch  may  include  dimensions,  symbols,  and  other information  needed  to  convey  your  idea  of  the  required change to someone else (like the project supervisor or project chief). TYPES OF DRAWINGS AND DIAGRAMS The types of drawings to be discussed here include working drawings, architectural drawings, mechanical drawings, shop drawings, and electrical diagrams. CONSTRUCTION  DRAWINGS A  construction  drawing  is  any  drawing  that furnishes the information required by the craftsmen to rough in equipment or erect a structure. The terms working  drawings  and  construction  drawings  are sometimes   used   interchangeably.   Information presented in a set of working drawings, along with the specifications,  should  be  complete  so  the  craftsman who uses them will require no further information. Working   drawings   show   the   size,   quantity, location,  and  relationship  of  the  building  parts. Generally,  working  drawings  may  be  divided  into  three main  categories: architectural,  mechanical,  and electrical. Regardless of the category, working drawings serve several functions: They provide a basis for making material, labor, and  equipment  estimates  before  construction starts. They  give  instructions  for  construction,  showing the sixes and location of the various parts. They provide a means of coordination between the different ratings. They  complement  the  specifications;  one  source of  information  is  incomplete  without  the  other when drawings are used for construction work. Architectural  Drawings Architectural drawings consist of all the drawings that  describe  the  structural  members  of  the  building  and their   relationship   to   each   other.   This   includes foundation  plans,  floor  plans,  framing  plans,  elevations, sections, details, schedules, and bills of materials. Plans A plan is actually a part of the architectural drawing that represents a view of the project from above. Two types of plans will be discussed here: plot plans and floor plans. 2-18



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