Term
| A over current protection device with a link that melts and opens the circuit on an over current condition |
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Definition
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Term
| A connection is made when 3 ends of separate phases are connected together creating a common wire |
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Definition
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| A connects made when the end of 1 separate phase is connected to the beginning of the next |
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Term
| A...... is a metal enclosed distribution system of..... available in prefabricated sections |
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Term
| Uses single lines and symbols to show system components and operations |
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Term
| Must follow NEC and NAPA requirements |
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Term
| On a transformer a marking X1 or X2 indicates |
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Term
| The voltage regulator on a transformer is provided with ....to allow for variable outputs of voltage |
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Definition
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Term
| States all dry type transformers over 112.5 KV shall be installed in fire resistant rooms |
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Definition
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Term
| Use as service entrance ...distribution or combination of both |
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Term
| Contain over current protection devices for lighting appliances and power distribution centers |
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Definition
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Term
| A reusable OCPD that opens a circuit automatically at a predetermined over current |
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Definition
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Definition
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Term
| The process of delivering electrical power where it is needed |
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Definition
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Term
| A switchboard with more than 6 switches |
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Definition
| Must include a main switch to protect or disconnect all circuits |
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Term
| When testing inside a enclosure ..make sure it is |
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Definition
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Term
| Used to measure incoming power on a switchboard |
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Definition
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Term
| Rating of capacity of transformers |
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Definition
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Term
| 3 main sections of a switch gear |
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Definition
Primary switch gear
Transformer
Secondary switch gear |
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Term
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Definition
| By manufacturer for maximum voltage and current |
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Term
| The portion of a distribution system between the final over current protection device and the Outlet or load connected to it |
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Definition
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Term
| A conductor embedded in the earth to provide a good ground |
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Definition
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Term
| Perform same function as a fuse and are tested the same way |
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Definition
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Term
| States no more than 42 over current devices for a lighting and appliance panel board or other mains are permitted in one cabinet |
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Definition
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Term
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Definition
Receive voltage and increase to an appropriate level
Provide a safe point to disconnect power
Provide a place to adjust and regulate outgoing voltage |
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Term
| The piece of equipment which a large block of energy power is delivered to from a substation and broken down into smaller blocks for distribution throughout a building |
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Definition
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Term
| A wall mounted distribution cabinet containing a group of overcurrent and short circuit protection devices for lighting appliances and power branch circuits |
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Definition
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Term
| Used to check a fuse that has been removed |
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Definition
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Term
| Receives incoming power and delivers it to control circuit and to loads |
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Definition
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Term
| Device that protects transformers and other electrical equipment from power surges caused by lightning |
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Definition
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Term
| Used first to stop and start motors...before magnetic motor starters |
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Definition
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Term
| A advantage of double break contact instead of a single break contact |
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Definition
| A higher rating in a smaller space |
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Term
| Replaced copper contacts because of problems with knife switches |
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Definition
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Term
| Show connection and placement of an installation or its component devices or parts |
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Definition
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Term
| Two contractors that are connected in such a way that both sets of contacts cannot be closed at one time |
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Definition
| Mechanical interlock contractors |
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Term
| Selection of mechanical motor starter |
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Definition
Based on phasing
number of poles
Voltage
Starter size
Enclosure type |
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Term
| Condition when motor is loaded so heavily the shaft cannot turn |
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Definition
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Term
| 3 stages of normal motor operation |
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Definition
Resting
Starting
Operating under load
In that order |
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Term
Used to protect a motor against very high currents
Short circuits or
Ground faults |
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Definition
| Fuses or circuit breakers |
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Term
| Has 1 hot wire and one neutral wire |
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Definition
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Term
| Has 2 hot wires and no neutral wires |
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Definition
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Term
| Has 3 hot wires and no neutral wires |
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Definition
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Term
| A device used only periodically to remove electrical circuits from there supply source |
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Definition
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Term
| Manual contractors normal uses |
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Definition
| Lighting and resistance loads |
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Term
| Main device in a overload |
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Definition
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Term
| Contractors with added overload protection device |
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Definition
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Term
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Definition
| Overload protection device |
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Term
| Temperature of air surrounding the motor |
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Definition
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Term
| A metal that has a fixed temperature at which it changes directly from a solid to liquid state |
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Definition
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Term
| A starter can be reset after it is removed |
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Definition
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Term
| Mechanical and electrical protection for operators and the starter |
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Definition
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Term
| A control device that uses push buttons to energize or de-energize the load connected to it |
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Definition
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Term
| Contacts that break the electrical circuit in two places |
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Definition
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Term
| A sensing device used to monitor the heat generated by excessive current and the heat created by ambient temperature rise |
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Definition
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Term
| Enclosures intended for indoor use primarily to provide a degree of protection against human contact with the enclosed equipment inn locations where unusual service conditions do not exist |
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Definition
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Term
| Uses of manual Motor starters |
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Definition
Air compressors
Conveyors
Drill presses |
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Term
| Manual controls directly control |
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Definition
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Term
| Electronic overload measures |
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Definition
| The strength of the magnetic field around the wire instead of converting the current into heat |
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Term
| How many lines must be broken using a contractor on a 3 ohm motor |
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Definition
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Term
| Most difficult arc to extinguish on a set of contacts |
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Definition
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Term
| Used to help confine, divide, and extinguish arcs for each set of contacts |
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Definition
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Term
| Used to provide a magnetic field that helps move contacts apart as quickly as possible |
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Definition
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Term
| As the power rating of a contactor or Moto starter decreases |
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Definition
| The NEMA number of contactor or motor starter increases |
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Term
| Current rating of contactor or motor starter is rating for |
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Definition
| The whole contactor divided by the number of contacts |
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Term
| Difference between contactor and motor starter |
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Definition
| Addition of overloadsto the motor starter |
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Term
| Overload relays used to protect motors |
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Definition
| Thermal and magnetic overload relays |
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Term
| Must be known when selecting the overloads for a motor starter |
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Definition
| Ambient temperature, full load current rating, service factor |
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Term
| Inherent motor protection |
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Definition
| Is designed to protect a motor from overloads |
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Term
| May have several sets of contacts |
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Definition
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Term
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Definition
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Term
| A device that dissipates the energy present across open contacts |
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Definition
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Term
| An overload relay which resets automatically |
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Definition
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Term
| Built into an overload device to indicate to the operator that an overload has taken place within the device |
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Definition
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Term
| Used on large motor starters to reduce the current flowing to the overload relay |
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Definition
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Term
| As ambient temperature increases |
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Definition
| More current is needed to trip the overload devices |
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Term
| Overload devices located directly on or in a motor to provide overload protection |
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Definition
| Inherent motor protectors |
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Term
| Performs the same function as a motor starter, but can also vary motor speed, reverse the motor, and display operating information |
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Definition
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Term
| An electronic device that changes AC into DC |
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Definition
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Term
| An electronic device that changes DC into AC |
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Definition
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Term
| Covers the design and installation of electronic systems that contain motors, motor circuits, and motor controllers |
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Definition
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