Line and load electrical terms pdf

In the electrical trades, the terms line and load are shorthand words that refer to the wires that deliver power from the source to a device. The electrical wiring to the disconnect is fed from the load side, or outgoing side, of the electric meter. Prepared by the task committee on structural loadings of the committee on electrical transmission structures of the structural engineering institute of asce. In the electrical world, these electrical terms are the difference between a device working properly or not. Electric current in which the flow of electric charge periodically reverses direction, whereas in direct current dc, also dc, the flow of electric charge is only in one direction. Electrician certification glossary of terms english spanish. Voltage the electrical pressure needed to force current through any load. In relation to a given switch or device, line refers to wires or voltage being supplied to it from upstream or from the direction of the main service panel.

An electrical load is the part of an electrical circuit in which current is transformed into something useful. One ampere is the amount of current flow provided when one volt of electrical pressure is applied. Every electrical plan must be designed to recognized industry standards, use appropriate electrical symbols, and conform to all applicable codes. Typically, the bigger the operating demand load, the. Understanding electricity requires knowledge of these basic electrical terms.

The amount of money frame by the supplier for the supply of electrical energy to various types of consumers in known as an electricity tariff. This is typical of long rural lines with isolated load areas. Load lines, 19661988 international convention on load. I think i am using electrical terms in this website according to their usual meanings by both electricians and homeowners. They are also used to connect high voltage equipment at electrical switchyards, and low voltage equipment in battery banks. That having been said, i searched for some basis of defining the terms line and load and began with ieee 100 1992 dictionary of electrical and electronic terms and started with the term load of which there are a great number of hits. The electrical load schedule is an estimate of the instantaneous electrical loads operating in a facility, in terms of active, reactive and apparent power measured in kw, kvar and kva respectively. Analysis of reactive power in power system electrical.

For the purpose of the present convention, unless expressly provided otherwise. That inductance is used to derive the line resistance. This means you dont consider linetoline loads when sizing the. The terms are used in the context of a single device and electrical box, so that the wires that deliver power into the box are described as the line wires, the upstream wires, or the incoming wires, while the wires passing onward to other devices are described as load, downstream, or outgoing wires. An annual forecast of the states peak electric demand load where there is a 10percent chance that the actual system peak load will exceed the forecasted value in any given year or, stated another way, it is expected that on the average the forecast will be exceeded once every ten years. Each load connected in a separate path receives the full circuit voltage, and the. The hot wires each carry 120 volts and are different phases. Put another way, the part of a circuit that connects to a welldefined output terminal is. Once the various parts and applicable standards have been determined, the designer creates a complete a set of plans. Definitions of household electrical terms glossary. You may or may not have heard the terms line and load when working with electrical connections, but what do those terms mean.

Electrician defines electrical terms related to house wiring troubleshooting. Jul 17, 2017 distinguishing between line and load isnt always necessary. Amplitude a term used to describe the maximum value of a pulse or wave. The load schedule is usually categorised by switchboard or occasionally by subfacility area. In the electrical trades, the terms line and load are shorthand words that refer to the wires that deliver power from the source to a device line, vs.

Pictorial glossary the pictorial glossary includes definitions and illustrations for many terms that are frequently used in the electrical industry. In other words, the electrical load is a device that consumes electrical energy in the form of the current and transforms it into other forms like heat, light, work, etc. I relearned some electrical terms today that may be useful later when working with gfci circuits. The symbols represent electrical and electronic components. An ultrasonic receiver that turns ultrasound signals into electrical signals a line receiver that receives signals from a wire or backplane.

Terms that are underlined and italicized are included in the glossary as a separate definition. A load converts electricity into heat, light or motion. The device which takes electrical energy is known as the electric load. Fundamentals of electricity welcome to module 2, fundamentals of electric ity. In electric power distribution, a busbar also bus bar is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. Readers should try to understand this line also with the help of this article. The maximum continuous load on a circuit breaker is permitted to be 80%. As you progress in the electrical trade youll hear a bunch of electrical terms being tossed around like their common knowledge. Adapter a cord or block style device with different ends that allows different devices to connect ac alternating current. Distribution feeder systems electrical engineering portal. The load is the horizontal line, connected between two pairs of intersecting lines. Basic electrical fundamentals voltage, current kilowatts, kilovolt amps.

The transient response is a function of the output capacitor value co, the equivalent. It takes years to get firm understanding of what they all mean. Our dilemma now is that workers are refusing to break load with this solid blade and. What is electricity, what is a gfi, what is a ground fault, what is meant by a circuit.

A line voltage 120v, 240v thermostat would have power in and out, which sounds like what you have. Glossary all terms and definitions listed alphabetically. That is, loading a generator means drawing current from it. Electrical field the region around a charged body in which the charge has. May 01, 2019 that having been said, i searched for some basis of defining the terms line and load and began with ieee 100 1992 dictionary of electrical and electronic terms and started with the term load of which there are a great number of hits. This manual provides the most relevant and uptodate information related to transmission line structural loads. The side of the meter that receives incoming power from the utility service lines is called the line side. With the switch on, the power travels through the load in this case, a light bulb filament, and back on the neutral, but no connection to the grounded buss bar, and that is how you get a shock from a neutral. Reluctance the resistance that a magnetic circuit offers to lines of force in a. We are committed to excellence, leadership and customer service. But if the old thermostat just had 2 wires, it might be a low voltage thermostat. Understanding the terms and definitions of ldo voltage.

This creates extra load on utility lines and increased heat of utility transformers and may cause stability problems to the entire ac line. Load is the wire going from the switch to the device. Nominal system voltage actual system voltage use for calculations single phase. Typical electrical drawing symbols and conventions. Lines of force invisible lines which conveniently illustrate the. Aug 24, 2018 in technical terms, electrical load is synonymous with current. Below youll find over xx definitions of electrical terms. Pdf analysis of the load flow problem in power system. The load schedule is usually categorised by switchboard or occasionally by subfacility. A is the cutoff point and b is the saturation point.

Load lines, 19661988 international convention on load lines, 1966, as amended by the protocol of 1988 articles of the international convention on load lines, 1966 article 2 definitions article 2 definitions. Sendingend port a a b b transmission line generator. This booklet is designed to help you become familiar with electrical terms commonly used in the. Load rejection the condition in which there is a sudden load loss in the system which causes the generating equipment. Impedance is most accurately defined as resistance in ohms but is commonly referenced in terms of percent when combined with the system voltage and line current flowing through the reactor.

Line sideload side versus bus sideline side nfpa xchange. Fortunately for you ive grouped them together to help you become a better electrician. The neutral load is the maximum unbalanced demand load between the grounded neutral conductor and any one ungrounded hot conductor as determined by the calculations in art. On the other hand, load refers to devices on the same circuit that are downstream of the one in question. Electrical symbols and electronic circuit symbols are used for drawing schematic diagram. Class of service the characteristics of electric service described in terms of. Electrons, electricity, electronic and other words that begin with electr. Examples include a lightbulb, a resistor and a motor. Line is the wire going from a current source into a switch. Glossary of electric systemrelated terms learning center. In the books of electrical machines, it is written that at leading pf load i.

Put another way, the part of a circuit that connects to a welldefined output terminal is considered an electrical load. Ohm the standard unit for measuring resistance to flow of. Load line for drawing the dc load line of a transistor, one need to know only its cutoff and saturation points. For example, a conventional wall switch which is a singlepole, singlethrow switch works equally well whether you attach the live circuit wire line to the top brass terminal or the bottom because the switch has only two positions. This means you dont consider linetoline loads when sizing the grounded neutral conductor. Ohm the standard unit for measuring resistance to flow of an electrical current. Tlc recommends that you download and save this pdf document and assignment to. The essential data achieved from a load flow study is the magnitude and phase angle of the voltage at every feeder and bus, and the real and reactive power flowing in every line 5, 6.

What does it mean when one wire goes into load, and one goes into line. Electricity tariffs circuit globe all about electrical. When referring to an electric device that can be connected to another one, such as a receptacle, line refers to the wires feeding it from the panel, which is upstream from the device in terms of the flow of electricity. A second meaning for load is the magnitude of the energy consumed by. Definitions of electrical terms you should know electrician. Line is power in and load is power out, as another answer said. This gives the advantages of ring main systems as line voltage drops are reduced at the various load substations there is a firm supply i. Normally open and normally closed these terms refer to the position taken by the contacts in a magnetically operated.

In other words, the tariff is the methods of charging a consumer for consuming electric power. Understanding the terms line and load in electrical. Guidelines for electrical transmission line structural loading. Understanding the terms and definitions of ldo voltage regulators 5 5 transient response the transient response is the maximum allowable output voltage variation for a load current step change. In case of dc, load is described by level of current. Load anything which consumes electrical energy, such as lights, transformers, heaters and electric motors. Considering that output voltage will vary based upon varying line, load, temperature and other conditions, it is strongly advised that droop sharing only be utilized for. You may view definitions of glossary items by click ing on terms and words that are underlined and italicized in the text. In technical terms, electrical load is synonymous with current. Electric service and meter installations manual dominion energy. Does load mean a heavy heap of something a truck hauls. Note that the capacitive load tries to increase the voltage. Distinguishing between line and load isnt always necessary. Load rejection the condition in which there is a sudden load loss in the system which causes the generating equipment to be overfrequency.

Traditional switched mode power supplies draw current from the ac line in short pulses, and as a result, the input current of such basic switched mode power supplies has high harmonic content. Glossary of home electrical terms the circuit detective. Understanding the terms and definitions of ldo voltage regulators. Load line analysis for a diode circuit i versus v d a plot of the current, i, versus the voltage drop across the diode, v d, will yield a straight line, called the load line, of. For example, a conventional wall switch which is a singlepole, singlethrow switch works equally well whether you attach the live circuit wire line to the top brass terminal or the bottom because the switch has only two positions open or closed. Measured line to line or line to neutral with a voltmeter. Load line analysis for a diode circuit i versus v d a plot of the current, i, versus the voltage drop across the diode, v d, will yield a straight line, called the load line, of possible values of current flow in the circuit. Basic insulation a single layer of required insulation to prevent electrical shock. All electrical work performed by the customer must follow the. Ac drive an electronic device used to control the speed of an ac motor. The line reactor provides additional circuit inductance. Heres a diagram to help you understand the situation, and why it happens. Electrical symbols electronic symbols schematic symbols.