Electrical Schematic Symbols
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Figure 8.118 shows some of the basic symbols that are used to designate contacts on schematic diagrams. Normally open Normally closed Transfer FIGURE 8.118 Electrical contacts symbols. Fixed resistor or R Potentiometer or or R Rheostat The graphic symbol system provides methods for schematic loop diagramming, functional diagramming (see Section 1.2), and electrical schematic diagramming of any process or system that requires measurement, indication, control, The wiring diagram usually shows general physical arrangement of the component devices or parts. A schematic diagram uses symbols instead of pictures for the working parts of the circuit. These symbols are used in an effort to make the Schematic diagram an electrical
drawing.that uses symbols to represent physical components. Wiring diagram a schematic drawing that shows the physical relationship ofall components and the information needed to hardwire the circuit.Electricians installing equipment in the field might work with electrical schematic diagrams if it is necessary to make specific There are graphic symbols for all of the basic components in an electrical circuit, such as capacitors, fuses, motors, 158 3.11 sChEmaTICs and symBols . 163 126.96.36.199 a sChEmaTIC By any oThEr namE Is a lInE dIagram . . . . . . . . . . . . . . . . . . . . 164 3.11.5 sChEmaTICs and TrouBlEshooTIng . 165 3.12 ElECTrICal sChEmaTICs .The symbols are not drawn to scale, and the installer must consult the shop
drawings.for specific dimensions. Important note: As required by NEC 240.24(B), all tenants are required to have ready access to the overcurrent devices protecting the wiring in their particular occupancy. Note that these symbols that are commonly used in schematic and on oneline drawings are located in Appendix H in They are 10 k FIXED RESISTORS 10 k 10 k 10 k 10 k 10k10 k VARIABLE RESISTORS FIGURE 419 Schematic symbols used to represent resistors. used to adjust the current in a circuit to a certain value. A potentiometer is a variable resistor Table 44 shows some of the commonly used symbols. You need to be familiar with all of the symbols; however, you don't need to memorize all of the variations. Wiring diagram manuals
include.a legend that helps you interpret the symbols.A wiring diagram, sometimes referred to as a schematic diagram, is a wonderful tool often compared to a road map. Salt Lake City would be clearly shown on the map with graphic symbols that might tell you not only its location but its relative
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