Schedules are usually expressed in tabular form and organized in a self-explanatory way that makes it easy to identify information quickly. Feeder schedules are used to help identify the size and number of wires used for the incoming service and outgoing loads within a construction project. In terms of electrical distribution, schedules are often included on switchboard and panelboard drawings to list the number of circuit breakers, their size, and the loads they serve. The term "schedule" can also refer to the dates in which a certain activity is to be completed, usually referenced as a "project schedule." When listing out items such as feeder breakers and wire sizes for a particular project or piece of distribution equipment, the schedule is used. Related: Electrical One-Line Diagram Symbols If the diagram cannot cover all of the components involved, additional diagrams can be drawn in conjunction with the main diagram. Other items such as instrument transformer ratios and protective relays can be found on a single-line diagram. System voltage, frequency, phase, and normal operating positions are typically included. These drawings should be kept on display in the main control room of a facility to help guide switching operations by identifying feeders and the loads they serve.
System voltage, transformer impedance, interrupting ratings, and fault current are just a few of the basic items included on a single-line diagram. Physical relationships are typically disregarded in a single-line diagram, however they should show all of the major components in the power system and list all important ratings. Also called one-line diagrams, these drawings show the flow of electrical power or the course of electrical circuits and how they are connected. When you need a birds eye view of a power system, the single-line diagram is often the first drawing to consult. Medoum-Voltage Switchgear One-Line Diagram.
In this article, we will briefly describe several types of common electrical diagrams encountered in the field and explain their purpose. The symbols and lines within an electrical drawing speak a language that everyone involved must understand in order to design, build, and troubleshoot electrical systems.
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Knowing how to read and interpret various types of electrical drawings are an essential skill that all electrical workers must posses to effectively carry out their tasks. The level of complexity within an electrical drawing will vary depending on the intended purpose and personnel working with the drawing.ĭesign engineers and technicians use schematics to build and troubleshoot complex circuits, while plant operators use single-line and riser diagrams to facilitate switching operations within their distribution system.
Designing, installing, and troubleshooting of electrical systems requires the use of various drawings to give engineers, installers, and technicians a visual representation of the systems they work with.Įlectrical equipment and circuitry is often expressed as symbols and lines that represent the various components and connections within a system.