Elap 2A Final Flashcards
Equipment designed to open circuits under fault conditions shall have an interrupting rating not less than the available voltage and circuit current at the line side of the equipment.
True
Equipment that is required to be readily accessible shall be capable of being reached quickly without the use of tools, with an exception for ___.
Keys
A conductors ____ is the amount of amperes it can carry continuously without exceeding its temperature rating.
Ampacity
The two fold purpose of the NEC is to protect ___ from the hazards associated with the use of electricity
Persons and property
Most voltages referenced in the NEC are ___ voltages
Nominal
Interpretations and approval of equipment are granted by the ___
AHJ
The AHJ can permit alternate ___ for installation.
Methods
Although installed in conformance with the NEC, all electrical installations may not be adequate for ___ expansion of electrical use.
Future
The NEC is not intended to be used as a ___ specification
Design
___ conductors are conductors not encased in a material recognized by the NEC as electrical insulation
Covered
Connectors, couplings, locknuts, and bushings are electrical ___
Fittings
___ means recognized as suitable for the use, purpose, ext.
Identified
Equipment that as been ___ is published in a directory by the testing lab certifying it is acceptable to the AHJ.
Listed
The purpose of a raceway is to help protect conductors from physical ___
Damage
The NEC requires that all electric equipment and conductors be ___ to be deemed acceptable to the AHJ
Approved
All unused openings other than those intended for the operation of equipment are required to be effectively ___ to afford equivalent protection.
Closed
Terminals for more than one conductor shall be ___
Identified
One of the ___ shall be readily accessible as required by the NEC.
Disconnecting means
___ conductors are the conductors form the service point to the service disconnecting means.
Service
___ conductors are all circuit conductors between the service equipment and the final branch circuit overcorrect device.
Feeder
The ___ is the portion of the electrical circuit between the last overcorrect device and the outlets or utilization equipment
Branch Circuit
A ___ load is a load where the waveform of the steady state current does not follow the wave shape of the applied voltage
Nonlinear
Branch circuits with not over 120 V between conductors are permitted to supply auxiliary equipment of electric discharge lamps
True
A GFCI receptacle or circuit breaker is set to trip at 10 mA
False
Receptacle outlets installed in a dwelling for specific appliances shall be located within ___’ of the appliance
6
At least one receptacle outlet shall be installed in ___’ or longer hallways of dwelling units.
10
___ is the ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration
Demand Factor
Branch circuit EGCs smaller than 4 AWG shall have a continuous outer finish that is either green or green with one or more ___ stripes
Yellow
All conductors of a ___ branch circuit shall originate from the same panelboard
Multiwire
A current flow of ___ mA will most likely cause the heart to stop pumping
100
A ___ is the amount of electricity required at a given time
Demand
Each single or multiple receptacle on a single strap is calculated at ___ VA.
180
Demand factors may be applied to ___ of the six loads of the standard calculation.
4
Four or more appliances that are fastened in place in a one family dwelling are calculated at ___ of the total loader all four appliances.
75%
The total load for household clothes dryers is calculated at ___ VA or the nameplate rating, whichever is higher (standard calculation)
5000
___ loads are loads that are not on the same time
Noncoincidental
The ___ load is the maximum unbalance between any of the ungrounded conductors and the grounded conductor
Feeder Neutral
For 1 systems, the formula ___ is used to determine minimum ampacity of the ungrounded conductors
I = VA/A
Heating or A/C loads are calculated at ___ of the nameplate rating and the largest load is used (standard calculation)
100%
After the minimum ampacity of the dwelling service has been calculated, Table ___ and 310.15(B)(7)(1) are used to determine the size of service entrance conductors
310.15(B)(16)
The demand had for household electric ranges rated in excess of ___ kW is calculated per Table 220.55 (Standard Calculation)
1-3/4
Feeders for several motors are calculated using the sum of the FLC tables of all motors plus ___% of the largest motor
25%
Less than four separately controlled electric space heating units in a dwelling unit are calculated at ___ % of their nameplate ratings (optional calculation)
65%
The ___ is the electrical supply, in the form of conductors and equipment, that provides electrical power to the building or structure.
Service
The ___ is the overhead conductors between the service point and the utility electric supply system
Service Drop
The __ is the underground service conductors that connect the utilities electrical distribution system and the service point.
Service Lateral
GFPE is designed to operate at settings not greater than 200 A
False
___ conductors are the conductors that extend from the service disconnecting means to the service point where the service point is located at the connections made at the service drip loop.
Overhead Service Entrance
Direct buried conductors emerging form the ground shall be protected from physical damage up to a point which is at least ___’ above finish grade
8
SE cable shall be supported at intervals not exceeding ___” and within ___” of every service head, gooseneck, or point of connection to a raceway or enclosure.
30; 12
Plug fuses have a voltage rating of ___ V between conductors in most applications
125
Insulated conductors installed in wet locations shall be of a type ___ for the use
Listed
No conductor shall be installed in such a manner that the operating temperature of its ___ is exceeded
Insulation
Flug fuses of 15A and lower are identified by ___ configuration of the fuse window
Hexagonal
Cartridge fuses with no markings are rated for ___ A
10,000
Circuit breakers that are not marked have an interrupting rating of ___ A
5,000
___ conditions include installations where the conductors are exposed to oils, greases, vapors, etc. that break down the integrity of the conductors insulation
Corrosive
Ampacity of feeder taps not over 25’ shall not be less than 1/3 of the rating of the overcorrect protective device protecting the ___ conductors
Feeder
In general, fuses and circuit breakers shall not be connected in ___.
Parallel
A ___ is a circuit breaker with an intentional delay between the time when the fault or overload is sensed and the time when the CB operates
ITCB
The next ___ standard size OCPD of 800 A or less is permitted to be used where the OCPD does not correspond to a standard size
Higher
A ___ is any current in excess of that for which the conductor or equipment is rated
Overcurrent
Type S fuses are designed for circuits not exceeding 100 V
False
Locations can be classified as either dry, ___ or wet
Damp
The greeks were the first to discover electricity about ___ years ago.
2500
A semiconductor contains ___ valence electrons
4
Direct current is described as ___
unidirectional
Alternating current is described as ___
bidirectional
One coulomb per second is equal to one ___
ampere
The amount of potential necessary to cause one coulomb to product to produce one joule of work is a ___
Volt
The unit of resistance to current flow is the ___
ohm
In a DC circuit, the current is directly proportional to voltage and inversely proportional to resistance is know as ___
Ohms Law
The force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them?
Coulombs Law
The amount of electrical power being used in a circuit is measured in ___
Watts
What is another term for electromotive force?
Voltage
A voltmeter has a very ___ resistance connected in series with the meter movement
High
A test meter that uses a scale and pointer to indicate values is a ___ meter
Analog
An ammeter is connected in ___ with the load to permit the load to limit current flow
Series
What meter is designed to be connected directly across the power source?
Voltmeter
What meter measures an amount of voltage during a period of time and produces a two dimensional image?
Oscilloscope
The function that is equal to the adjacent divided by the hypotenuse is the ___
cosine
What memory aid will help you remember the trigonometric function relationships?
Oscar had a heap of apples
The function that is equal to the opposite divided by the hypotenuse is the ___
Sine
A line that indicates both magnitude and direction is a ___
Vector
A voltaic cell is constructed of two unlike metals and a(n) _____, alkaline, or salt solution.
Acid
Several cells connected together that produce voltage are called a _____.
Battery
The LeClanché cell is also known as a(n) _____ cell.
Carbon-zinc
Thermocouples produce voltage because of the action of two dissimilar metals. The voltage produced depends on the type of metals used and the _____ difference between the junction and the open ends.
Temperature
The amount of energy a cell can deliver is called its _____ capacity.
Current
The no-load voltage of a cell is greater than the normal load voltage because of the internal _____ of the cell.
Resistance
Piezoelectricity refers to electricity produced by some materials when they are subjected to _____.
Pressure
The amount of voltage produced by an individual _____ is determined by the materials from which it is made.
Cell
To perform a load test on a lead-acid battery, the amount of test current should be _____ times the ampere-hour capacity.
Three
What type of cell can be recharged?
Secondary
What type of cell cannot be recharged?
Primary
In 1800, Alessandro Volta was experimenting with producing electricity. He called his battery _____.
Voltaic pile
