Electrical Contractor Terminology – Glossary E
Find an electrical engineering term alphabetically:
|Earth Fault Protection System – A protection system which is designed to excite during faults to earth.|
|Earthing Transformer – A three-phase transformer intended essentially to provide a neutral point to a power system for the purpose of grounding.|
|Eddy Current – The current that is generated in a transformer core due to the induced voltage in each lamination. It is proportional to the square of the lamination thickness and to the square of the frequency.|
|EEI – Edison Electric Institute. [www.eei.org]|
|EERA – Electrical Equipment Representatives Association. EERA is an association of electrical manufacturers representatives. Additional information on EERA can be found at www.eera .org. Young & Company is a member of EERA .|
|Effective Internal Resistance (Battery) – The apparent opposition to current within a battery that manifests itself as a drop in battery voltage proportional to discharge current. Its value is dependent on battery design, state-of-charge, temperature and age.|
|Effective Power (Watts) – See “Watt.”|
|Effective Range – The range of values of the characteristic quantity or quantities. For example the energizing quantities to which the relay will respond and satisfy the requirements to precision.|
|Effective Setting – The setting of a protection system including the effects of current transformers, this effective setting can be expressed in terms of primary current or secondary current from the current transformers.|
|Effectively Grounded – Intentionally connected conductors or electric equipment to earth, where the connection and conductors are of sufficiently low impedance to allow the conducting of an intended current.|
|Efficiency (Lighting) – A ratio of light emitted from a luminaire to the light produced by the bare lamp.|
|EHV – See “Extra High Voltage”.|
|Elbow – A device used to connect a medium voltage cable (4-35KV nominal) to an electrical component such as a switch or transformer. Its name is derived from the fact that its shape is an “L”. Elbows are available in ratings of 200, 600 and 900 Ampere.|
|Electrical Hazard – A dangerous condition such that contact or equipment failure can result in electric shock, arc flash burn, thermal burn, or blast.|
|Electrical Relay – A device designed to produce sudden predetermined changes in one or more electrical circuits after the appearance of certain conditions in the controlling circuit.|
|Electrical Safety – Recognizing hazards associated with the use of electrical energy and taking precautions so that hazards do not cause injury or death.|
|Electrically Safe Work Condition – A state in which the conductor or circuit part to be worked on or near has been disconnected from energized parts, locked/tagged in accordance with established standards, tested to ensure the absence of voltage, and grounded if determined necessary.|
|Electricity – The flow of electrons through a conducting medium.|
|Electrolyte (Battery) – In a lead-acid battery, the electrolyte is sulfuric acid diluted with water. It is a conductor and also a supplier of hydrogen and sulfate ions for the reaction.|
|Electromechanical Relay – An electrical relay in which the designed response is excited by a relative mechanical movement of elements under the action of a current in the input circuit.|
|Electromotive Force – Potential causing electricity to flow in a closed circuit.|
|Elongation – The amount (% length) that a conductor or other material can stretch before breaking when a pulling force is applied.|
|Embedded Generation – Generation that is connected to a distribution system possibly at LV instead of HV.|
|EMS – See Energy Management System.|
|EMTDC™ – Electro-Magnetic Transients for DC. Incorporates both EMTP and ATP, and integrates DC systems and components.|
|EMTP – Electromagnetic Transients Program.|
|End Point Voltage – Battery Voltage reached at the termination of a discharge. Also Known as the Cut Off Voltage.|
|End-of-Discharge Voltage – The voltage of a battery at the termination of a discharge but before the discharge is stopped.|
|End-Point Voltage – The Cell or Battery voltage at which point the rated discharge capacity has been delivered at a specific Rate-of-Discharge. It is also used to specify the cell or battery voltage below which the connected equipment will not operate.|
|Energy – That which does work or is capable of doing work. Electricity is energy that is measured in kilowatt hours.|
|Energy Management System – A system in which a dispatcher can monitor and control the flow of electric power by opening and closing switches to route electricity or to isolate a part of the system for maintenance.|
|Entrainment (Battery) – The process whereby gasses generated in the cell carry electrolyte through the vent cap.|
|EPDM – Ethylene Propylene Dione Monimer. This is a synthetic rubber compound used as insulation in making electrical components.|
|EPR – Ethylene Propylene Rubber, a synthetic rubber compound that is used as cable insulation.|
|EPRI – Electric Power Research Institute. EPRI is located at P.O. Box 10412, Palo Alto, CA 94303.|
|EPROM – Electrically Programmable Read Only Memory.|
|Eutectic – An alloy used to form the melting point of a fuse. It is frequently silver or tin based.|
|Event – In the digital world an event is any information acquired or produced by the digital control system.|
|Exciting Current – The magnetizing current of a device such as a transformer. Also known a field current.|
|Expressway Roadway (Lighting) – A divided major roadway for through-traffic with partial control of access and generally with interchanges at major crossroads. Expressways for non-commercial traffic within parks and park-like area are generally known as parkways.|
|Extension, Box – An add-on section that fits to the bottom or to the top of a gread level box, extending its height.|
|Extra High Voltage – An electrical system or cable designed to operate at 345kv (nominal) or higher.|
|Extrusion – The application of a semi-solid rubber or plastic material such as PVC onto a conductor.|
Would you like a complimentary…no obligation …project consultation? Please feel free to call for more details.
Goodiel Electric LLC.
Florida License – EC13005097.
For a Great Deal, call Goodiel Electric.
Master Electrician and Martin County Florida based Electrical Contractor.
In Martin County, Goodiel Electric LLC. services Hobe Sound, Indiantown, Jensen Beach, Jupiter Island, North River Shores, Ocean Breeze Park, Palm City, Port Salerno, Rio, Sewalls Point and Stuart.
In St. Lucie County, Goodiel Electric LLC. services Port St. Lucie, St. Lucie West, Tradition, Torino, Tesoro, Lake Charles, Lake Forest, Magnolia Lakes, PGA Village, The Vineyards, St James Golf Club, The Cascades, Fort Pierce, White City and the unincorporated areas of St. Lucie County.
Port Saint Lucie Tile Contractor.
Boyer Tile, LLC.
Port St. Lucie Tile Contractor – Tile Installation.
Call via Home Phone: (772) 626-1403.
Mobile: (772) 626-1403.
Skype: (772) 626-1403.
Quality Work is My Trademark.
Tile with Style – St. Lucie West Floor Tiling Contractor.
In Martin County, Sam Crane Electrical, LLC. services Hobe Sound, Indiantown, Jensen Beach, Jupiter Island, North River Shores, Ocean Breeze Park, Palm City, Port Salerno, Rio, Sewall’s Point and Stuart.