Term
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Definition
| A device designed to open or close a circuit by non-automatic means or automatically on a predetermined over current value and not causing damage to itself. |
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Term
| Ratings for circuit breaker |
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Definition
| Voltage, frequency, continuous current, short time current, control voltage, mega colt amps |
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| Voltage of circuit breaker |
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Definition
| Max continuous voltage without a dielectric failure of the insulation. |
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Term
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Definition
| Frequency at which the breaker is designed to perform |
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Term
| Continuous current rating |
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Definition
| Current the device can carry without exceeding it's rated temperature rise over a set period of time. |
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Term
| Short time current rating |
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Definition
| Max current it can safely carry for two 0.5 second periods with a 15 second rest period between them at zero current |
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Term
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Definition
| Voltage the mechanism of a breaker is designed to operate |
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Term
| Final____ may be installed on poles, on grade-level pads, or in underground vaults. |
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Definition
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Term
| Annual electricity transmission and distribution losses may result in losses as much as 6 to 7 percent of the generated electrical power, mostly attributed to ___ |
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Definition
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Term
| ___ take high transmitted voltages and reduce the voltage for appropriate distributive levels. |
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Definition
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Term
| ___ service is an electrical service in which service-entrance conductors are run through the air from a utility pole to the building. |
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Definition
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Term
| A ___ is a typically the link between the power delivered to a building to property and the start of the building's power distribution system. |
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Definition
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Term
| A ___ switchboard has space and mounting provisions for metering equipment, over current protection, and a means of disconnect for the service conductors. |
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Definition
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Term
| ___ are the main place where most indoor electrical circuits begin. |
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Definition
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Term
| The most common loads requiring simple and complex control are ___ . |
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Definition
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Term
| ___ diagrams are used when designing large commercial and industrial installations to show the path of electrical power throughout a building. |
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Definition
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Term
| Feeder ___ deliver the power from the source to ta load consuming device. |
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Definition
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Term
| ____ load is the maximum output required of a transformer |
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Definition
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Term
| The advantage of a ___-connected secondary is that the 1 phase power draw may be divided equally over the three transformers. |
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Definition
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Term
| Electrical ___ occurs when loads on a transformer are placed so that each coil of the transformer carries the same amount of current. |
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Definition
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Term
| The color ___ always indicates a conductor used for grounding. |
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Definition
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Term
| Three-phase harmonics ___ are installed between the transformer and the distribution panel. |
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Definition
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Term
| Single phasing is the maximum condition of ___ unbalance in a distribution system. |
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Definition
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Term
| Single phasing is reduced through the use of properly sized dual-element ___ and heaters. |
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Definition
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Term
| ___ is the changing of the sequence of any two phases in a 3 phase motor circuit. |
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Definition
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Term
| ___ causes the 3 phase lines to move out of phase so the lines no longer 120 degrees apart. |
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Definition
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Term
| As electrician will be able to observe the burning and opening of the first few turns of the winding that occur when a motor has failed die to a voltage ____. |
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Definition
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Term
| ___ power is power obtained from a battery or DC generator. |
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Definition
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Term
| Any time a voltage unbalance is more than 1 % the system should be tested for a ____. |
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Definition
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Term
| Poor power factor can be improved by adding power factor-correcting ____ banks in the utility distribution system and/or in the customers facility |
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Definition
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Term
| ____ Power generation is the use of small-scale power generation technologies located close to the loads that are being served. |
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Definition
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Term
| a ___ grid is an electrical grid that uses computer-based remote control and automation to deliver electrical power from where it s generated to costumers. |
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Definition
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Term
| before advanced metering infrastructure, utilities typically learned of outages when ____ reported problems. |
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Definition
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Term
| A ____ measurement unit is a device that measures electrical waveform on an electrical grad. |
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Definition
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Term
| The primary sources of power ____ are solar energy, vibration, magnetic fields, thermal (hear) energy, and radio frequency (RF ) waves. |
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Definition
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Term
| digital ___ allow the utility to change protection settings and logical based on the time of day and day of the week. |
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Definition
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Term
| significantly reduces stress on system components and improves power quality by reducing the voltage sags experienced by customers upstream of a fault. |
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Definition
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