Term
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Definition
| utility brings power to property line |
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Term
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Definition
| whose responsible for getting power from property line to the building? |
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Term
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Definition
| two ways of getting power into a building |
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Term
| cheapest but ugliest, best option for lines over 5kV, easiest to maintain |
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Definition
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Term
| costly, best aesthetics, cant be pulled out, can only be dug up for repairs |
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Definition
| characteristics of underground service |
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Term
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Definition
| conduits to run wiring in underground systems |
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Term
long runs of serveral hundered feet
underground service |
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Definition
| what requires manholes with acces to cables? and in what service? |
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Term
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Definition
| steps voltage down from primary to secondary voltages |
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Term
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Definition
| power provided by utility |
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Term
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Definition
| used to change a service voltage |
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Term
| building may have varying voltage requirements or line voltage is high to lessen line loss |
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Definition
| why would you need to change the service voltage in a building? |
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Term
| 2400, 4160, 12, 470, 13, 200 v |
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Definition
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Term
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Definition
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Term
| single-phase or three-phase |
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Definition
| transformers come in which phases? |
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Term
| lasts, longer, better overload protection, lower operating cost, can withstand overheating better |
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Definition
| characteristics of a unit w/ higher temperature insulation |
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Term
- doesnt take up costly building space
- better noise control
- cheaper capital cost
- easy to maintain
- easy to dissipate heat
- low cost, long life, oil-filled can be used
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Definition
| benefits of putting a transformer outdoors |
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Term
can cause fires, takes up alot of space
potential fire/explosion hazards |
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Definition
| hazards of putting a transformer indoors |
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Term
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Definition
| what type of transformer must be placed in a fireproof vault |
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Term
| "less-flammable" filled units of 35 kVA |
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Definition
| what type of transformer doesnt need to be placed in a vault |
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Term
| nonflammable filled unit and dry transformers |
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Definition
| what type of transformer requires no vault but is expensive |
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Term
| larger, noisier, heavier, more loss, shorter life, costly |
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Definition
| characteristics of dry transformers |
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Term
| natural ventilation is cheaper than mechanical ventilation |
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Definition
| why would you place a vault on the exterior wall of a building |
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Term
- read remotely or on site (necessary for peak use charges)
- individual or single building metering (possibly with sub-metering)
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Definition
| name various types of metering |
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Term
high = cheaper kWH rates
low = costlier kWh rates |
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Definition
| which costs more, high or low voltage services? |
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Term
| manual/blade; contactors; electronic |
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Definition
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Term
| where service lines enter the building |
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Definition
| where are service switches located? |
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Term
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Definition
| type of switch that uses contact blocks instead of a handle operated blade (wall mounted light switch is an example) |
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Term
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Definition
| what is the advantage of a contactor switch |
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Term
| manual or remote pushbutton, timer, float switch, thermostat, pressure switches |
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Definition
| name examples of contactors |
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Term
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Definition
| a device that changes ac of one voltage to alternating current of another voltage |
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Term
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Definition
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Term
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Definition
| service switches are assembled onto what? |
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Term
| general-duty safety switches |
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Definition
| switches intended for normal use in lighting and power circuits |
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Term
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Definition
| switches intended for frequent interrupting, high-fault currents, and ease of maintenance |
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Term
| hvac, motors, lighting, etc. |
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Definition
| what can contactors control |
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Term
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Definition
| open and close electric circuit |
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Term
- current and voltage
- duty
- poles and throw
- fusibility
- enclosure
- horsepower
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Definition
| what are manual switches rated by |
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Term
| disconnect the service from the building in an emergency |
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Definition
| what is the purpose of service switches? |
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Term
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Definition
| electrical equipment essential for safety when normal power fails (illumination, alarms, fire pumps) |
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Term
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Definition
| equipment whose stoppage might create hazards (goes beyond emergency equipment needs) |
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Term
| requires fuel, space, exhaust, fresh air |
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Definition
| what does a generator require in power equipment |
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Term
| short term, centralized - mostly used for lighting |
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Definition
| characteristics of a battery in power equipment |
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Term
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Definition
| electronic device with conducting and non-conducting states |
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Term
| they are made by applying voltage signal |
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Definition
| how are changes made to solid state switches |
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Term
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Definition
| do manual and solid state switches have the same ampere and voltage ratings? |
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Term
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Definition
| how do solid state switches become a programmable time switch? |
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Term
| close and open an electric circuit by physically moving two electrical conductors into contact with each other to close the circuit and physically separating them to open the circuit |
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Definition
| how to mechanical switches operate |
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Term
| the amount of current that the switch can carry continuously and interrupt safely |
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Definition
| what is the current rating of a switch |
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Term
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Definition
| when a switch carries the neutral through unbroken by means of a solid link within the switch |
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Term
| 1-, 2-, 3-, 4-, 5-pole construction |
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Definition
| how do you define switches in construction? |
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Term
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Definition
| a contactor that latches mechanically after being operated |
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Term
| electrically operated mechanically held contactor |
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Definition
| what is another name for remote-control switch |
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Term
| automatic transfer switch |
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Definition
| what kind of switch is used for emergency and standby power arrangements? |
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Term
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Definition
| type of switch that is either electromechanical devices consisting of a low-speed miniature drive motor, or containing a soild-state electronic timer. |
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Term
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Definition
| logic/memory device programmed to respond according to a particular algorithm to given input signals |
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Term
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Definition
| an electronic device that uses a programmable memory chip for internal storage of instructions that in turn implement specific functions such as logic, timing, counting, and so on. |
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Term
| fuses and circuit breakers |
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Definition
| name two circuit protection devices |
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Term
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Definition
| a simple device consisting of a fusible link or wire of low melting temperatures |
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Term
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Definition
| when a wire is enclosed in an insulating fiber tube |
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Term
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Definition
| when a wire is enclosed in a porcelain cup |
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Term
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Definition
| fuses should be used in combination with what? |
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Term
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Definition
| an electromechanical device that performs the same protective function as a fuse, but also acts as a switch |
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Term
| the overload of electricity |
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Definition
| the thermal trip in a circuit breaker is for the what? |
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Term
| the shortage in electricity |
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Definition
| what is the magnetic trip for in a circuit breaker? |
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Term
| molded case breakers and large air-circuit breakers |
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Definition
| air circuit breakers are available in two types |
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Term
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Definition
| a large, free-standing assembly of switches and fuses (an/or circuit breakers), which proviude switching and overcurrent protection to a number of cirucuits connected to a single electric source. |
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Term
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Definition
| generally, low voltage switchboards with large circuit breakers and all high voltage equipment |
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Term
| building-type switchboard |
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Definition
| molded-case circuit breakers utilized in a switchboard |
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Term
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Definition
| modern switchboards that are encased in a metal structure with safe access from the front |
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Term
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Definition
| a switchboard at a smaller scale |
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Term
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Definition
| and assembly of switches and fuses and/or circuit breakers; usually final distribution point to branch circuits that feed apparatus and devices |
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Term
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Definition
| what are the panelboard components mounted inside of? |
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Term
| override, daylight, dimming, electrical demand control |
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Definition
| what does intelligent panelboards provide |
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Term
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Definition
| load control and switching run by microprocessor which controls individual panel circuit breakers |
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Term
| simplifies facility operations, removes need for remote relays, relay panels, timers, remote control switches and their wiring |
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Definition
| what are the benefits of intelligent panelboards |
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Term
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Definition
| two electrical motor types |
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Term
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Definition
| older technology used in elevators |
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Term
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Definition
most common motor used in buildings today (squirrel cage induction motors)
also used for fans, blowers, pumpes, compressors, converyors, and elevators |
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Term
| squirrel-cage induction motors |
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Definition
| early design of a motor which consisted of a group of bars welded together into a cylindrical cage-type shape |
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Term
| premium efficiency motors |
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Definition
| federal law in 1922 mandated that most motors used in buildings meet new efficiency standards referred to as what? |
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Term
| to start and stop the motor and to protect it from overload |
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Definition
| function of a motor control |
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Term
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Definition
| when the contacts are operated by hand, what is the controller called |
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Term
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Definition
| when contacts are operated by magenetic coil controlled by pushbuttons, thermostats, or other devices |
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Term
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Definition
AKA. reduced- voltage starter, used when a procedure is undesirable because of voltage dip and flicker caused by the large inrush current or limitations
stabilizes the system |
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Term
VVVF (variable-voltage, variable-frequency controllers)
VFD (variable frequency drives) |
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Definition
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Term
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Definition
| controller that gives smooth, continuous speed control over a range exceeding 30 to 1 |
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Term
|
Definition
| `provides considerable energy economies that usually result in rapid payback of relatively high first cost of equipment |
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Term
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Definition
| all motos controllers required to have a disconnect combined with the starter into a single unit |
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Term
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Definition
| combining motor starters, disconnect switches,motor controls,and indicating devices into a sinle large assembly |
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Term
| conventional (mechanical) or solid state (electronic, programmable) |
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Definition
| motor control equipment can be found in what two ways |
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Term
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Definition
| everything that fits in a wall outlet box (receptacles, switches, dimmers, fan controls) |
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Term
- hospital
- federal specification
- general-purpose
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Definition
| wiring devies come in 3 grades (according to NEMA and UL) |
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Term
1. hospital
2. premium/industrial
3. commercial
4. residential |
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Definition
| wiring devices - most expensive to cheapest |
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Term
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Definition
| a contact device installed at the outlet for the connection of a single attachment plug |
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Term
| duplex convenience outlets, or duplex outlet/receptacles |
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Definition
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Term
by the number of poles
and the number of wires |
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Definition
| how are receptacles identified |
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Term
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Definition
| typical ratings of wiring switches |
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Term
single pole
2-pole
3-way
4-way |
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Definition
| typical construction of switches |
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Term
| toggle, key, push, rocker, rotary, timer, programmable |
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Definition
| typical switch opperating handles |
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Term
smaller wiring
no conduit required
system flexibility
central control w/ monitoring
load control
load override |
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Definition
| benefits of low voltage switching |
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Term
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Definition
| a control scheme that used light duty voltage to control line voltage relays which in turn do the circuit switching |
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Term
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Definition
| uses existing power lines to send an additional low-voltage, high frequency, binary signal which controls individual load equipped with a receiver. |
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Term
| power line switching (carrier system) |
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Definition
| energy management, which requires flexzible load switching systems - can only be added to existing buildings |
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Term
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Definition
| removes, surges, spikes, radio frequency interference (RFI) or noise from faulty power equipment and improperly shielded or grounded electronics |
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Term
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Definition
| relatively new electrical term that describes the process of converting utility-supplied electrical power |
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Term
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Definition
| relatively slow and long lasting disturbance source |
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Term
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Definition
| low amplitude, high frequency voltage that results in distorted electrical waveform |
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Term
|
Definition
large, short duration voltage variations also known as surges or spikes
temporary excess of voltage |
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Term
|
Definition
| small computer installations use what type of equipment |
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Term
| integrated power-conditioning unit |
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Definition
| larger computer installations use what tupe of equipment |
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Term
| transient voltage surge suppression |
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Definition
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Term
| uninterruptible power supply |
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Definition
| needed because power-conditioning equipment supplies clean power but dont function in an outage |
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Term
| battery power, battery power followed by standy generator; standby generator |
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Definition
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