Electrical Engineering Terms G

Greenfield. The trade name for flexible metallic conduit. Ground Fault / Ground-Fault Overcurrent. (1) An abnormal connection in an electrical circuit, where the normal load path is either partially or completely bypassed through this non-circuit return path, which is the equipment-grounding system of an electrical power distribution system. The low …

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Electrical Engineering Terms H

High Voltage (High Tension). A general term used to describe circuits with system voltages greater than 600 volts and to imply that the voltage is of such a value that it is dangerous to humans. Extreme caution should always be used when troubleshooting equipment marked with this term. Horsepower (HP) …

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Electrical Engineering Terms I

I/O Module Field replaceable modules that accept or send signals from field devices and condition the signal for the CPU. IGBT Insulated Gate Bipolar Junction Transistor – A semiconductor device that provides the base technology for the modern drive. Imperial Units These are the measurement units used in the United …

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Electrical Engineering Terms K

Kirchhoff’s Current Law.   The sum of the currents entering and leaving a node is equal to zero; the sum of the currents entering a node is equal to the sum of the currents leaving that node. Kirchhoff’s Voltage Law.   The sum of the voltage drops in a closed loop …

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Electrical Engineering Terms L

Linear Load. A utilization-equipment load where the wave shape of the current follows — is in phase with — the wave shape of the applied voltage. At the point of common-return on the neutral conductor, linear single-phase AC currents cancel only the unbalanced load current. Line Disturbances. These are fluctuations …

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Electrical Engineering Terms M

Megger. An electrical test instrument that uses a high-voltage output for insulation testing and high-resistance measurements. Motor Starter A device used to supply full line voltage to a motor and include overcurrent protection. Motor Nameplate Every electric motor is labeled with a motor nameplate. The motor nameplate contains information about …

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Electrical Engineering Terms N

NEMA National Electrical Manufacturers Association is a group who publishes electrical and medical imaging standards.   No-Load Condition. An electric motor operating at rated frequency (AC) and rated voltage with the drive train of its mechanical load disconnected from the rotor driveshaft. The motor turns at near synchronous speed, which …

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Electrical Engineering Terms O

Ohmmeter. An electrical test instrument used for lower-value (as compared to high-resistance) electrical resistance measurements. Ohmic Resistance. In defining this resistance: A DC circuit is said to have a resistance of one ohm when one volt will produce a current of one ampere through it. Overcurrent protection A device used …

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Electrical Engineering Terms P

Power Supply A transformer and rectifier circuit are encased together to supply a lower control voltage. Programmable Logic Controllers An industrial computer that is used to control and execute real-world functions based on the programmed logic. Power Supply Provides power to the PLC and converts the incoming powers to various …

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