Select Page

Circuit Drawings and Wiring Diagrams

Successfully acting trade desires the facility to browse and interpret many various sorts of drawings and diagrams. Understanding circuit symbols associated parts is ANother one in each of the essential building blocks needed to become a lineman. If associate lineman misinterprets a drawing or diagram once wiring a house, devices may be incorrectly placed in or maybe unfathomable altogether. Knowing some way to properly take knowledge from associate electrical drawing or diagram and apply it to the necessary world is crucial for electricians
What i don’t understood is actually how you are not actually much more well-liked than you might be right now. You’re so intelligent. You realize therefore significantly relating to this subject, made me personally consider it from so many varied angles. Its like women and men aren’t fascinated unless it is one thing to do with Lady gaga! Your own stuffs excellent. Always maintain it up!

Lesson Outcomes

The student area unit during a position to:

  • perceive some basic symbols for schematic drawings and wiring diagrams.
  • understand some basic symbols for schematic drawings and wiring diagrams.
  • end up a diagram.
  • understand the excellence between different types of diagrams.
  • information to draw a basic drawing with electrical symbols.


Students will area unit introduced to electrical instrumentality and language. in addition, they’re going to understand:

  • Basic electrical circuits and theory.
  • Branch circuit wiring.
  • A basic high browse drawing.


Block diagram: a diagram of a system throughout that the principal parts or functions square measure depicted by blocks connected by lines that show the relationships of the blocks.

Circuit drawing (diagram): a simplified normal graphical illustration of associate device.

Line diagram: a one-line diagram or single-line diagram is also a simplified notation for representing associate electrical system. The one-line diagram is akin to a diagram except that electrical parts like switches, circuit breakers, transformers, and capacitors square measure shown by standardized schematic symbols.

Pictorial diagram: a diagram that represents the weather of a system victimization abstract, graphic drawings or realistic photos.

Schematic diagram: a diagram that uses lines to represent the wires and symbols to represent parts. it’s accustomed to showing but the circuit functions

Wiring diagram (or pictorial): a simplified normal picturing of an associate device. It shows the weather of the circuit as simplified shapes, and also the thanks to type the connections between the devices. A diagram generally offers extra knowledge concerning the relative position and arrangement of devices and terminals on the devices.

Activity 1: Drawing circuits

  1. victimization the essential electrical drawing and thus the image chart on the next pages, justify the electrical symbols to the students.
  2. provide students a customary photocopy of a drawing (see the highest of this Activity Plan) that options an area and have them draw one or two 12-device circuits victimization electrical symbols and ways that for circuits as shown inside the drawing (Figure 5).

Note: Page fifty 9 inside the Electrical Code Simplified Book will facilitate students to grasp what share devices square measure allowable per circuit and their electrical symbols.

  1. Have students draw two retailers that require separate circuits for a refrigerator associated a dishwasher that goes directly back to the panel (home run is shown as a quick line directed toward the panel with AN arrow on it).
  2. Have students draw a legend of symbols for his or her drawing.

Activity 2: Basic diagram

  • Have students end up a basic diagram.
  • The diagram will show the circuit students will wire in Activity created 10: Wiring Devices and Activity created 11: Wiring a Wall Section.
  • The diagram have to be compelled to show incoming power feeding a receptacle.
  • From the receptacle, cable feeds a switch.
  • From the switch the cable feeds a light-weight.

Evaluation tips

The student:

  • Understands basic sorts of electrical drawings
  • Can end up a drawing that displays understanding
  • Knows the excellence between a circuit drawing and a diagram
  • Draws and understands a diagram

Extension Activity

Draw extra wiring diagrams that embody extra devices in many configurations.

Example: Wiring from a switch box running 2 lights. The circuit may be extra troublesome if the scholar understands the concepts

You can watch the following video or read the written tutorial below.