Used to convert between wiring and schematic diagrams, the numbering system is a method of identifying and labelling each electrically common point in a circuit. Two wires are considered electrically common if they share an electrical connection with no switches or loads between them, and so would be assigned the same number in the diagram.
In contrast to the control circuit, the power circuit provides the large values of voltage and current used by the motor itself. Must be equipped with overcurrent and overload protection, and horsepower-rated contacts in the control gear equal to the voltage and current ratings of the motor. In contrast to the Power Circuit, the Control Circuit consists of inputs, in the form of switches, pushbuttons or pilot devices, which when activated, can either directly, or through a magnetic motor starter, energize a load.
The Control Circuit often operates at a lower voltage than the Power Circuit for safety and ease of installation. A sharp and fast rise in current over a short period of time fractions of a second where the value of current is far greater than the nominal line current.
Also known as a "maintaining" contact, these are the normally open contacts of a magnetic starter that are connected in parallel with the start button in a three-wire control circuit.
When using the conventional NEMA numbering system, they get wire numbers "2" and "3. Referring to two or more points in a circuit which have no loads or switches between them and have no potential difference between them. You probably encounter and interact with schematic diagrams in everyday life without ever needing to pull electrical wiring through walls. For example, think of a simple bike trail map. It uses colored lines to represent the different trails and how they connect to each other.
The white dots represent trailheads where riders can easily get on and off the trail, refill water bottles, and rest. Schematic drawings are also used in manufacturing during the design stage. They help engineers understand how different parts fit together and interact to make the product work properly.
In addition, a simple flowchart diagram can be used as a schematic that defines the manufacturing and distribution process. Chemists use schematic drawings to describe how different elements interact with each other to create a product. Pictorial diagrams, block diagrams, and wiring diagrams are the simplest diagrams and are best suited for the average homeowner or handyman tackling a weekend project. The diagrams include enough detail to identify components and to help you understand how to connect the components together.
These simple diagrams are not meant for installing new systems or adding to existing systems. Rather, they are meant to be used with simple projects. Schematic diagrams are more detailed and are meant to be used by professionals.
The standardized symbols ensure that experienced workers can read and understand the system so they can troubleshoot problem areas, add new components to existing systems, and install new systems. Sign up for Lucidchart to begin diagramming all of your technical systems and increasing clarity at your company. Lucidchart is the intelligent diagramming application that empowers teams to clarify complexity, align their insights, and build the future—faster.
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Engineering diagrams: The difference between pictorial and schematic diagrams Reading time: about 6 min Posted by: Lucid Content Team Professionals and do-it-yourselfers rely on engineering diagrams when they need to know what components are included in a system, where these components are located, and how they connect and interact with each other.
What is a pictorial diagram? The following are a few types of pictorial diagrams that you may encounter. Block diagram As the name implies, a block diagram uses simple block illustrations instead of standardized symbols or detailed images to represent the main components of a system.
Schematic diagrams are not intended to illustrate the physical size or appearance of the device nor the location. In troubleshooting, electrical schematics are essential because it enables a technician to trace the circuit and its function without regard to the actual location or physical size of the component.
Figure 2. Schematic view of a Simple Circuit. A ladder diagram is used to point out relationships between circuit components, not the actual location of the components. Ladder diagrams provide a fast and easy understanding of the connection of electrical components in a circuit or operation.
Figure 3. Ladder Diagram. The arrangement of symbols in ladder diagram should promote clarity and understanding. Graphic symbols, abbreviations, and device designations are drawn per industry standards. The circuit should indicate the most direct path of logical sequence. Lines between the symbols can be horizontal or vertical but should be drawn to minimize lines from crossing each other.
Ladder diagrams should not be confused with a one-line diagram. A one line diagram has only one line between individual components. Ladder diagrams; however, often show multiple lines leading to and from components whether they are series or parallel connections.
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