Lesson 6 Understanding And Drawing Electrical Symbols Used On Blueprints

Schematics are also sometimes called prints or blueprints. The basic symbol for most lights is a circle and as with duplexes variations on how it is drawn and abbreviations next to it convey additional and essential information.

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The skills you learn can be applied to reading blueprints for residential commercial manufacturing and electric utility projects.

Lesson 6 understanding and drawing electrical symbols used on blueprints. 2 can be seen on drawing No. 03-01-02 a 123 iec company sequence index nen 5152. Scroll down to find our floor plan symbols diagram.

These are things like doors windows stairs walls cabinets and sinks. AA A-6 Building section A-A can be seen on drawing No. Main object line Hidden or invisible line Indicates center line 3 3 4 Dimension lines Extension lines Symbol indicates center line Indicates wall suface N.

It should be noted that electrical symbols are not standardized throughout the industry which is one reason why electrical drawings typically have a symbol legend or list. This is called 38 scale. Standard logic functions all have unique schematic symbols such as AND OR and XOR.

Adding a bubble to the output negates the function and you will get NAND and XOR. 3 L-5 Detail section No. Plan Symbols 2 A-4 Wall section No.

For electrical symbols see our Electrical Blueprint Symbols glossary. Publication example iec 617. The lighting fixtures and other electrical features shown on the reflected ceiling plan are given symbols that are keyed to a legend.

If not a symbol may fall on top of a dimension thus requiring the dimension to be moved. 3 can be seen on drawing No. When the current passes through the lamp it will produce light.

Sections of the symbol legend include. These drawings use standard symbols that allow technicians to quickly understand how a circuit is constructed what function it performs and how to trouble-shoot the equipment. Drawing is the actual distance or size of the component.

All symbols may be drawn in any position the inscriptions shall. 6 - Starting Circuit Breaker 7 Rate of Change Relay 8 - Control Power Disconnecting Device 9 - Reversing Device 10 - Unit Sequence Switch 11 Multifunction Device 12 - Overspeed Device 13 - Synchronous-speed Device 14 - Underspeed Device 15 - Speed - or Frequency-Matching Device 20 - Elect. 38 1 Read as 38 inch on the drawing equals 1 foot on the actual component or system.

The general principles for preparing blueprints will also be covered. Symbols have been derived from iec publication 617 nen 5152 and company standards. Well start out with electrical switches.

These symbols give the laborers a reference point so they can complete the job to specs. 12 1 Read as 12 inch on the drawing equals 1 foot on the actual. All the doors and windows shown below are marked with numbers such as 3068.

But these above should be enough for a beginner in schematic reading. Operated valve solenoid valve. For example if a component part measures 68 inch on the drawing the actual component measures 2 feet.

How to Read A Electrical Drawing 1. Shows the path of the wire. Symbols are used on electrical drawings to simplify the drafting work for both the drafters and the workers interpreting the drawings.

Electrical Drawing Symbols Legend. And our Make Your Own Blueprint tutorial for those wanting to do their own blue print drafting. Also check out our How to Read Blueprints tutorial.

Match each plumbing symbol to the correct name. A lamp is usually represented as a circle with a cross inside it. The design details of a particular project.

Nen-k-13 non standard norm. The most commonly used electrical blueprint symbols including plug outlets switches lights and other special symbols such as door bells and smoke detectors are shown in the figure below. To pass the assessment you have to be familiar with these symbols and other information from the lesson.

Explanations for common household electrical items such as three-way switches and switched duplex plug outlets are below the figure. The key on the floor plans will explain the particular symbols used on any project. Familiarize with Standardized Electrical Symbols Knowing the meanings of basic electrical symbols in your electrical drawing will help you quickly understand and troubleshooting the circuit.

Here are the electrical symbols including communications symbols like phones doorbells and security systems. Blueprints are used to present electrical-system design information in a variety of ways. Undoubtedly there are many electrical schematic symbols not mentioned on this list.

Reading and understanding electrical drawings Electrical drawings can represent anything from a single-line power distribution to a power or control circuit and are prepared using various symbols for electrical devices and their interconnections with lines representing conductors or wires used for interconnections. Each electrical component has a univer-sally recognized symbol and schematic drawings typically show. There are many different types of electrical switches.

What the electrician needs to follow on the blueprint is the symbol legend usually found on the side of the print or the title page of the packet. It is advisable to draw in all the electrical symbols on the plan before it is dimensioned or notes are added. Use this quiz and worksheet to assess your understanding of electrical schematic symbols.

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