Trystan Casey
Electrical drawings are complex sets of symbols and interconnection notations that can be challenging to understand. However, learning to interpret them is a valuable skill for electricians, engineers, and even maintenance workers. To read electrical drawings, one must familiarize themselves with the symbols, lines, and abbreviations used, and understand how to interpret the overall message conveyed. This can be achieved through online courses, books, or guides, which provide an understanding of the basics and help develop the ability to interpret more complex drawings. Practice is key, and with experience, electrical drawings can be read using context clues, without the need for constant symbol lookup.
| Characteristics | Values |
|---|---|
| Who should learn to read electrical drawings? | Anyone who wants to install, maintain, or repair electrical systems, including electricians, electrical apprentices, estimators, engineers, and contractors. |
| Why learn to read electrical drawings? | To understand the layout of components and create new distribution systems and circuits. To identify faulty components, troubleshoot systems, and improve safety. |
| How to learn to read electrical drawings? | Familiarize yourself with the symbols, lines, and abbreviations used on the drawings. Learn how to interpret the message conveyed by the drawings. Start with simple drawings and work up to more complex ones. Take a course or use online guides and books. |
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What You'll Learn
Learn the meaning of symbols, lines and abbreviations
To read electrical drawings, you must first become familiar with the symbols, lines, and abbreviations used. Electrical drawings contain a complex set of symbols and interconnection notations that can be challenging to understand. Symbols are used to represent various electrical components, such as duplex receptacles, ground-fault protectors, and circuit breakers. For example, in a floor plan showing the duplex receptacle layout, symbols represent the locations of the receptacles, while notes provide additional information such as the type and size of overcurrent protection required.
Lines in electrical drawings indicate the paths of circuits and are often curved to distinguish them from building lines. Arrowheads are a specific type of line used to denote a home-run to a panel board. Different line types can also indicate various aspects of the electrical system, such as feeders or busways. Abbreviations and acronyms are commonly used in electrical drawings, and understanding these is crucial. For instance, "GFCI" stands for "Ground Fault Circuit Interrupter", a device that protects against electric shocks, while "NEC" refers to the National Electrical Code, a widely used set of electrical standards.
European electrical drawings have their own distinct set of symbols and rules, which can differ from those used in other regions, so it's important to familiarize yourself with the specific standards relevant to your location. Electrical drawings may also include numerical values representing wire sizes or the number of conductors in a circuit. Interpreting these drawings involves understanding the meaning of these values and how they relate to the electrical components and systems depicted.
To master the interpretation of electrical drawings, one must learn the language of symbols, lines, and abbreviations used within them. This knowledge will enable you to decipher the information conveyed and apply it to practical electrical work, such as installation, maintenance, or repairs. Understanding these drawings is a valuable skill for anyone in the electrical field, from electricians and apprentices to engineers and contractors.
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Understand how to interpret the message conveyed
To interpret the message conveyed by electrical drawings, it is essential to familiarize yourself with the symbols, lines, and abbreviations used in the drawings. Electrical drawings contain a complex set of symbols and interconnection notations that can be challenging to comprehend. However, with practice and a systematic approach, you can enhance your ability to interpret these drawings effectively.
Firstly, it is crucial to understand the different symbols used to represent system components. Symbols play a vital role in electrical drawings, and each physical component, such as resistors, capacitors, and transistors, has its own unique symbol. For example, resistors are typically represented by zigzag lines with terminals at each end, while capacitors are depicted using two lines perpendicular to the terminal plates. Having access to a symbol key or a schematic symbol cheat sheet can be immensely helpful when encountering new or unfamiliar symbols.
Secondly, pay attention to the lines and their connections. In electrical drawings, lines represent wires, and their intersections, known as nodes, indicate connections between components. When wires split into multiple directions, junction nodes are formed, represented by small dots. Straight lines may sometimes be confused with building lines, so curved circuit lines are often preferred. Additionally, arrowheads are used to indicate a home-run to a panel board, and the absence of a node signifies that wires are not connected and merely pass by each other.
Thirdly, abbreviations and conventions are essential in interpreting electrical drawings. Understanding wire numbers and naming conventions can help you navigate the drawings efficiently. For instance, a wire number can indicate the page, line, and specific wire within a circuit. Different companies may use slightly different symbols, abbreviations, and conventions, so staying adaptable and utilizing context clues are crucial.
Lastly, interpreting the message conveyed in electrical drawings also requires understanding the overall layout and purpose of the system. Being able to visualize how the components interact and work together is essential. This includes comprehending the placement and configuration of programmable logic controllers (PLCs) and understanding how the electrical system functions as a whole.
By combining knowledge of symbols, lines, abbreviations, and system layout, you can effectively interpret the message conveyed by electrical drawings. Practice is key, and with time, you will develop the skill to read and understand these drawings with ease, making informed decisions about installation, maintenance, or repairs.
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Know how to read wiring diagrams and schematics
To be able to read wiring diagrams and schematics, one must become familiar with the symbols, lines, and abbreviations used on the drawings and learn how to interpret the message conveyed. Electrical drawings contain a complex set of symbols and interconnection notation that can be difficult to understand.
Wiring diagrams may follow different standards depending on the country they are used in. For example, an electrical wiring diagram could be a single-page schematic of how a ceiling fan should be connected to its power source and its remote switches. A wiring diagram may also include the wirings of a vehicle, such as how the horns are powered and connected to the controller on the steering wheel.
Schematic symbols represent physical components, such as resistors, capacitors, transistors, and fuses. For example, the symbol for a fuse is a narrow gauge wire, and the symbol for a motor is a circle with the letter "M" and positive and negative terminals on either side. The symbol for an antenna, which transmits radio signals, is more intuitive, represented by a straight line with zig-zagged lines at the top.
In addition to symbols, it is important to understand schematic nets, which tell you how components are wired together in a circuit. Nets are usually given a name that specifically states the purpose of signals on that wire. For example, power nets might be labelled "VCC" or "5V", while serial communication nets might be labelled "RX" or "TX". Voltage nodes are single-terminal schematic components that allow you to connect component terminals to assign them to a specific voltage level.
When reading wiring diagrams and schematics, it is also helpful to look out for wire tags. These are combinations of letters and numbers on wires or cables that indicate which device or terminal block they should be connected to. They are useful for troubleshooting, as they allow you to easily identify where a wire should be connected if it becomes disconnected.
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Understand ladder diagrams for programmable logic controllers
Ladder diagrams, also known as ladder logic, are used to program PLCs (programmable logic controllers). They are a graphical representation of the control logic used for programming PLCs. Ladder logic is a programming language that uses symbolic notation to express logic operations.
Ladder diagrams consist of horizontal lines of control logic, called 'rungs', and vertical lines at the start and end of each rung, called 'rails'. Each rung represents a rule, and the various rules execute simultaneously and immediately when implemented with relays and other electromechanical devices. When implemented in a PLC, the rules are typically executed sequentially by software in a continuous loop, or 'scan'. The CPU runs the program from left to right and top to bottom.
The symbols placed throughout the rungs are graphical instructions, with inputs denoted by 'I' and outputs by 'O'. For example, I:1/1 and I:1/2 indicate that the input card has been placed in slot 1, with the first input representing channel 1 and the second input representing channel 2 on the same card.
Ladder logic is widely used to program PLCs, particularly in industrial applications, due to its simplicity and ease of learning compared to other programming languages. It is useful for simple but critical control systems and for reworking old hardwired relay circuits. Ladder logic also allows factory engineers and technicians to develop software without needing to learn a general-purpose computer language.
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Learn how to identify faulty components
Learning how to read electrical drawings is an important skill for maintenance workers and managers, even if they aren't licensed electricians. It is also useful for those working in electrical engineering. Electrical drawings can come in the form of blueprints, schematic drawings, wiring diagrams, and PLC wiring diagrams.
To learn how to identify faulty components, you must first be able to interpret the symbols, lines, and abbreviations used in electrical drawings. Each physical component (e.g. resistor, capacitor, transistor) has a unique schematic symbol. For example, resistors are usually represented by zigzag lines with a terminal at each end, while capacitors are represented by two lines perpendicular to terminal plates. Variable resistors are shown with a diagonal arrow across the standard resistor symbol. The direction of the arrow in potentiometers, which are three-terminal devices, indicates the third terminal.
Component names usually consist of one or two letters and a number. The letter part of the name represents the type of component—for example, R stands for resistor, C for capacitor, and U for integrated circuits. Each component name should be unique, and prefixes are usually standardized.
Once you have learned the symbols and naming conventions, you can use this knowledge to identify faulty components. For example, if a component is not functioning as expected, you can refer to the schematic to identify which component it is, and then locate it in the circuit. You can then test or inspect the component to determine if it is faulty.
It is also important to understand how the circuit works by looking at the schematic. This will help you identify any issues with the connections between components or any errors in the circuit design.
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Frequently asked questions
The first step in learning how to read electrical drawings is to understand the different symbols used to represent system components.
Some common symbols include:
- Resistors: usually zigzag lines with a terminal at each end, or a blank rectangle
- Variable Resistors: a diagonal arrow intersecting the standard resistor zigzag symbol
- Potentiometers: an arrow pointing to the zigzag resistor at a right angle
- Non-Polarized Capacitors: two lines perpendicular to the terminal plates
- Polarized Capacitors: two lines perpendicular to the terminal plates
Yes, there is a book titled "Electrician's Book: How to Read Electrical Drawings" by Barbu, Cornel that is designed for beginners in the electrical field.
Yes, there are many online courses available that can help you learn how to read electrical drawings. One example is the "Electrical Systems: Reading Drawings and Schematics" course offered by LinkedIn Learning.
The best way to practice reading electrical drawings is to start with simple schematics and work your way up to more complicated drawings. It is also helpful to have a basic understanding of electrical wiring and to use context clues to figure out the symbols and conventions used in the drawings.
