Wednesday, August 19, 2009

Definition of Electrical Engineering

Definitions: (in alphabetical order)

Access - (the wiring methods) applied to be removed or suspended without the structure or finish surface of the building or permanent structure not stop.

Access - the case of equipment () With a view about: closed doors, elevation or other effective is not safe. (Happy) to reach

, Easy access - (access light) so fast operation, renewal, or inspections, for all to use the attack or remove obstacles or to resort to portable ladders is necessary for the taking without, chairs , etc.

Ambient air temperature, water, or around the earth - of temperature. Conductor ampacity 86 ° F ambient temperature is right below the temperature of the cooling effect may differ with the current capacity of the pipe. (See Section 310-10 of the code and to understand the power of)

Ammeter - an electric current meter, amperes in calibrated to measure.

Lines or equipment, amperes expressed in Ampacity - current capacity.

Ampere - The SI unit measuring the quantity of electricity.

Jumper connection - or insulated conductor between metal parts required to install electrical conductivity used a bare should be electrically connected. Often forced to a different career for a house in the thick wall of knockouts for a way around the service equipment enclosure for a commitment from the socket.

A whole, will continue as unbroken - the state.

Continuous load - A load where the maximum current is expected for three hours or more. Branch circuit protection device of the continuous load of less than 125% assessment body should not be.

Demand - the amount of load when it is added to the total amount of load that is connected to a ratio of amperes or KVA () is an electrical system or feeder circuit,. 80% of demand factors, for example, a load circuit connected in only 80% of the time will be at the same time the signal does. Conductor capacity is based on the amount of stress.

Dustproof - construction or operation of defense is that his success with the dust.

Dusttight - subject to specified conditions, so that dust enclosing the test case is designed not to fall.

Duty, permanently - a commitment that a greater burden for a long time to handle the requirements.

Greater need, and again - a commitment that the stress and rest, no load or load charge, and a gap of weight, the requirements for the operation of switching, and more.

Duty, seasonal - that requires periodic performance has renewed the terms of a recurring type.

Duty, a short time - a condition that a low to a greater burden of the works in the service needs and definitely specified time.

Tasks that are different - the service requires that the load demands in the operation, and time is in the middle of a wide diversity of both topics.

Explosion - proof - designed and built to blast and fire or an explosion outside the building.

Service facilities in a sub-feeder panel or a branch circuit panel or to a certain point a large block of power with a ladder or pipe run as feeder busway - a circuit when power is in short circuit of the block.

Land - soil body (such) as the implementation of a large, but as a general idea of the electronic circuit for zero and an arbitrary potential.

, Effectively based - deliberately, in an earth ground connection or connections, and an impedance low enough to stress that the existing capacity for the Union or unnecessary risk to lead in May to stop the construction of adequate through.

Conductor - a system or circuit conductor that purpose, usually white or gray in color based based.

Earth - one to serve as a water-based wire with ground electrode, metal enclosures for equipment and / or conductor based on the system to add a guide of the land for a bare conductor or insulated - motor frames, panel electrical system could be in boxes and other equipment housings made of metal. In most systems, pipes, a pipe in the form of grounding is used.

Equipment grounding conductor - of the long-term instruments - metal parts, raceways and other equipment for the system based conductor with respect to a conductor of the service, or derived from a different source on the electrode conductor, or both, of the circuit grounding.

Grounding electrode - a conductor for grounding the grounding conductor of the device is connected to electrodes, based conductor, or both, derived from a different circuit of the service or source.

Ground fault circuit interrupter - a body of energy in a circuit or personal conduct of the factors responsible for the protection of a strong, if a land with a few more before the operation of the overcurrent value for the security of supply is less than the circuit and more current.

Ground fault protection of equipment - a system over a harmful conduct the separation line means for ground fault currents to protect equipment, all the unfounded criticism of the circuit conductors. Conservation is at the current levels of loss of a supply circuit overcurrent protection device operation for the protection of pipelines by less than are necessary.

Income from - the eyes (in the view) if the code is that " 'in the eyes of the tool," in the eyes of the terms "Om" "in, and others of other equipment, and equipment not specified 50 'away from each other show

Ratings interrupter - a device that is the most tested in standard conditions to the rated voltage is current.

Label - a label for which, at the national level recognized trademark or other testing laboratories as the article identifier indentify an item is considered and standards meetings.

Listed - a tool list or an organization acceptable content, published by government officials and officers in the production of listed equipment or materials to keep the product evaluation with the periodic inspection, and this list is included in either the Declaration or the appropriate equipment set of content standards or test in some ways has been found suitable for use.

Location, humidity - the amount of moisture up to a liberal site, some cellar, barns, cold storage, and stores such as.

Able to dry - a place normally, the humidity or moisture: as a moisture or humidity in a dry place under the temporary, the case of a building under construction as can be.

Location, basa - a position that water or other liquids with saturation.

Megger -, particularly a megaohm (million ohms of power cables and other equipment to measure an insulation resistance test instrument) m; regiestered is a trademark of James Biddle Co.

Megaohm - resistamce power of a unit of the amount of one million ohms.

Megaohmmeter - very much a tool to measure the resistance.

Noninductive circuit - a circuit where the magnetic effect of electricity in a certain way or at least a zero to low.

Nonlinear Load - A load where the voltage applied to steady state for the current wave of wave form.

Om or an electrical resistance, one volt per ohm to face - The SI derived unit PERE am.

Ohmmeter - ohms to measure resistance in a device. Check this picture how a ohmeter to make a small transformers had been used to see. The ohmmeter battery indicator deflection by moving the amount of current through the wire is determined. An unknown barrier or the ability to measure the electrical circuit before, ohmmeter to check. If the appropriate limit the amount of energy, a number of half-scale deflection can be estimated in selected when the resistance between the probe. If the resistance is not known, but the selector switch is at the highest level. Meters in that area before the unknown resistance to be calibrated to read zero is chosen is measured.


Overcurrent - Any current overcapacity in the equipment or the ampacity of a conductor was present assessment. The short circuit or ground fault may result from the surcharge.

Overload - the system or process for which the load is more than this amount. Sin, a short circuit or ground fault of the way, is not more than one.

Panelboard - a panel group or panel mounting units in a single panel to the: or switch and / or automatic overcurrent protective devices with light, heat, power or to control individual circuits can be used for buses and total capacity. This is a reduction in the cupboard or on or against a wall or partition in front of and to have been made.

Plenum - Air conditioning part of a chamber or room

Rain - design, plan, or device in the form of rain with the successful conduct of the trial in the circumstances to prevent interference.

Raintight - a design that beat the rain or exposure to water will not lead to access protected.

Even if this system - a cable area, performing a battery, a solar photovoltaic system, or a generator, transformer, or converter windings and conductor involved in the early to permanently based circuit conductor connected with a direct power other system is a connection.

Drop service - talk to a customer's connection to the company's aerial power lines run from the power of cable.

Service Conductors - The main supply conductors or transformers in the areas of service delivery to the

Access Service Conductors - (above) out of the building as a common thing for equipment and services between the terminals of the service manager, clean the walls of the building where the marriage or by tap-and-drop service.

Access Service Conductors - (U) at the service of connection to service equipment at the time of the head of service between the terminals.

Service facilities - necessary equipment, usually a switch or switch and fuses and their accessories included, the body of the conductor around a main building and to a reduction in the supply and construction financing for the supply off.

Service lateral - the main road between the underground service conductors, transformers, or a pole or other structure, including all levels, and the service-conductors to enter the first point of connection with an adequate space terminal box, meter or other enclosure in inside or outside wall of the building. Which location with adequate terminal box, meter, or other housing, the port number of service entrance conductors to buildings is concerned.

Institutions and utility companies serving the area of wiring connection between the point of service - the issue.

Communicator - a large single room, or panels of the frame assembly switch, overcurrent and other security equipment, buses, equipment, with a forward or backward or both, and generally. Switchboards are usually behind and before long, and do not intend to establish in control cabinets.

Switch, usually in the general distribution and branch circuits for use - associated with a switch. Amperes and the voltage is capable of evaluating their status is.

Switch, Snap for general use - a type of common use so that they flush switch device can be set up in boxes or outlets, or any other way to cover the wiring system to set up the National Electric Code in respect of the construction is done.

Switch to a different - a step that power from a power source for the isolation of the circuit. And did not break the circuit only after evaluating the other's conduct should be safe.

Switch, knife - A switch in the circuit is closed with a charming clip blade contact.

Switches, motor - circuit - a switch, HP in the evaluation, so that the evaluation of the voltage switch with the same engine with a horsepower rating of a maximum operating power interruption.

Switch, transfer - a transfer of a switch or an automatic device from a power source of one or more load conductor connections to move nonautomatic is.

Switch - leg - one light outlet box where a luminaire or lamp holder wall switch, lighting or other load or off with a box set up shop with a part of the circuit: control circuit is a part of the branch.

Voltage drop - a tool for internal and input impedance of the unit or a tool to prevent the production of between a loss of voltage. Large voltage drop to the head of all electrical installations, so that electricity, heat, light for no more than 3%, and an invite or what is the connection. In addition, investors and the circuit conductors for a maximum total voltage drop, the industry should never be more than 5%.

Waterproof - so that water / moisture entry into jail in some circumstances, the test can not be constructed.

Weatherproof - designed or protected that exposure to the season with a successful operation.

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