Eddy Current Loss - The current that is generated in the core due to the voltage that is induced in each lamination by the alternating magnetic flux. The eddy current is proportional to the square of the thickness of the lamination and to the square of the frequency.
Elbow - An insulated and shielded device for connecting high-voltage cables to apparatus.
Electric Fuse - see Fuse, Electric
Electrical Contractor - Any person, corporation, company, firm, organization, or partnership performing or engaging to perform, either for their or its own use or benefit, or for that of another, and with or without remuneration or gain, any work with respect to an electrical installation or any other work to which Code applies.
Electric Elevator - An elevator in which the motion of the car is obtained through an electric motor directly applied to the elevator machinery.
Electric Vehicle - an automotive-type vehicle for highway use that;
Electrical Equipment - Any apparatus, appliance, device, instrument, fitting, fixture, machinery, material, or thing used in or for, or capable of being used in or for, the generation, transformation, transmission, distribution, supply, or utilization of electric power or energy, and without restricting the generality of the foregoing, includes any assemblage or combination of materials or things which is used, or is capable of being used or adapted, to serve or perform any particular purpose or function when connected to an electrical installation, notwithstanding that any of such materials or things may be mechanical, metallic, or non-electric in origin.
Electrical Installation - The installation of any wiring in or upon any land, building, or premises from the point or points where electric power or energy is delivered therein or thereon by the supply authority or from any other source of supply, to the point or points where such power or energy can be used therein or thereon by any electrical equipment and shall include the connection of any such wiring with any of the said equipment, and any part of the wiring aforesaid, and shall also include the maintenance, alteration, extension, and repair of such wiring.
Electrical Metallic Tubing (EMT) - A raceway of metal having circular cross-section into which it is intended that conductors be drawn and which has a wall thinner than that of rigid metal conduit and an outside diameter sufficiently different from that of rigid conduit to render it impracticable for anyone to thread it with standard pipe thread. (Intent - EMT is not considered a metallic conduit since the outer walls are too thin to be threaded)
Electrical Nonmetallic Tubing - A pliable nonmetallic corrugated raceway having a circular cross-section.
Electricity - The flow of electrons.
Elevator - A hoisting and lowering mechanism equipped with a car or platform which moves in guides in a substantially vertical direction but not including tiering or piling machines which operate within one storey, or endless belts, conveyors, chains, buckets, or similar devices used for the purpose of elevating materials.
Elevator Machinery - The machinery and its equipment used in raising and lowering the elevator car or platform.
Emergency Lighting - Lighting required by the provisions of the National Building Code of Canada for the purpose of facilitating safe exit and access to exit in the event of fire or other emergency.
Energy - the result from the process of rapid change in state of any matter. One of the primary characteristics of energy is that it cannot be controlled (i.e. explosion), however it can be harnessed (i.e. engine combustion).
Eutectic - An alloy with a melting point lower than that of any other combination of the same components; an alloy used as a fuse element to detect and protect against high damaging environmental temperatures' a fuse element used to monitor long overload conditions on a transformer by melting when a combined temperature (top oil temperature rise due to loading plus temperature rise due to current passing through element proper) equal to the fuse's melting temperature is achieved.
Eventful Failure - Any electrical failure that would result in: extensive apparatus damage and need for repair; the spilling of hot and/or environmentally damaging fluids; that which could result in loss of a human life; catastrophic failure; violent failure; any electrical failure that is accomplished by a visible demonstration and may include tank rupture, damage bushings or loosened cover.
Explosion-Proof - Means enclosed in a case which is capable of withstanding, without damage, an explosion, which may occur within it, of a specified gas or vapour and capable of preventing the ignition of a specified gas or vapour surrounding the enclosure from sparks, flashes, or explosion of the specified gas or vapour within the enclosure.
Exposed as Applied to Live Parts - Means that live parts can be inadvertently touched or approached nearer than a safe distance by a person and is applied to parts not suitably guarded, isolated, or insulated.
Exposed as Applied to Wiring Methods - Means not concealed.
Extra-Low-Voltage - see definition for Voltage.
Extra-Low-Voltage Power Circuit - A circuit, such as valve operator and similar circuits, that is neither a remote control circuit nor a signal circuit, but that operates at not more than 30V and that is supplied from a transformer or other device restricted in its rated output to 1000 VA and approved for the purpose, but in which the current is not limited in accordance with the requirements for a Class 2 circuit.
|Source: Canadian Electrical Code and National Electrical Code|