fundamental of electricity final
the temperature rating with the ampacity of a conductor shall be so selected and coordinated so selected and coordinated so as not to exceed the lowest temperature rating of any connected________
conductor,equipment termination or electrical device .
a series circuit that has only one path for _________ flow
current
Current that flows in only one direction it is called unidirectional. it is also referred to as ________ current.
direct
what is the volume allowance for a duplex receptacle with size 12 copper conductors feeding it
double allowance
the part of an atom that has a negative charge is
electron
in a parallel circuit, the total voltage is _______ the individual voltage drops across each branch of the circuit.
equal to
a terminal for the connection of an equipment grounding conductor to the ground pole of a grounding type receptacle shall not be designated by a green colored hexagonal head terminal screw or nut.
false
chapter 1 trough 4 of the NEC apply
generally to all electrical installations
changes other than editorial to the 2020 national code indicated with______ shading within sections.
gray
equipment grounding conductors size 6 and smaller with insulation or individual covering that is __________ or otherwise identified as permitted by the section shall not be used for ungrounded or grounded circuit conductors.
green or green with yellow stripes
the screw shell of a luminaires or lamp holder shall be connected to the ___________.
grounded conductor
a connection of three (or more) current paths is often called a ___________.
node
the statement "current is directly proportional to voltage and inversely proportional to resistance" is known as ______ law.
ohms
a conductor is normally made of atoms with __________ electrons in the valence shell
one to three
the purpose of the NEC is
practical safeguarding of persons and property
all conductors of the same circuit and , where used the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same______
race way ,trench ,cable tray
one of the steps that occurs frequently during combinations circuit solutions is _______ the circuit into a simpler circuit.
redrawing
in a parallel circuit , the total current is equal to the _______ of the individual branch circuits.
sum
in the combination circuit , to identify which paths are series and which paths are parallel , you should ________.
trace the current path(s)
EMT conduit shall permitted as an equipment grounding conductor
true
a 15 ampere receptacle is allowed to be installed on a 15 or20 ampere circuit
true
Three way and four way switches shall be so wired that all switching is done only in the _______ circuit conductor. 404.2(a)
ungrounded conductors
Unit of electromotive force is the
volt
receptacles shall have the terminal intended for correction to the grounded conductor identified by a metal or metal coating that is substantially_______ in color.
white
what is the total volume of a4x1 1/2 square box with a single gang plaster ring marked with 2.4 cubic inches?
23.4in
a Size 3 inch EMT conduit has _______ in Squared area for over two conductors (40%)
3.538 in
in general the overcurrent protection for a size 10AWG copper conductor regardless of the insulation type shall not exceed ______ amperes
30
what size 4 square box is required for 10 size 14 conductors?
4x1 1/2 in
how many 250 kcmil type THWN-2 conductors can be installed in a 3" rigid PVC SCh.80 conduit?
6
unless listed or identified otherwise , termination and conductors of circuits size 14-AWG,0-100 ampere or less shall be rated at________.
60
what is the percentage of area fill for a conduit 20 inches or less in length installed between boxes , cabinets, and similar enclosures?
60 %
An insulated grounded conductor of No. ____ or smaller shall be identified by a continuous white or natural gray outer finish or by three continuous white stripes on the green insulation along its entire length.
6AWG
termination provision of equipment for circuits rated over 100 amperes, or marked for conductors larger than 1 AWG shall be used on the conductors rated _________
75
what is the ampacity adjustment factor for a raceway, cable or trench with six installed current carrying conductors?
80
type THW-2 insulated wire has an temperature rating of __________ for wet or dry location?
90 degrees
the_______ having jurisdiction had the responsibility for deciding upon the approval of equipment and materials.
AHJ
what is the minimum trade size rigid PVC Sch. 80 Conduit required with the following wires? 3x size 1/0 THWN 1X SIZE 1 THWN 1X SIZE 6 THWN
SIZE 2
the unit of electrical power is the
Watt (W)
give the approximate area of the following wire 350 kcmil RHW
.7870in
what is the ambient temperature correction factor for a 60 celcisus degree rated conducor install in a environment with a room temperature of 40 degrees celcius
.82
what volume conductor allowance is required for this box using #14 wire?
11 size 14-22 in
in general, branch circuit carrying continuous loads, such as luminaries in a commercial building shall an ampacity of not less than______ percent of the load.
125
what is the ampacity of a size 1 THWN -2 copper conductor?
145 amps
Symbol for current
I (amps)
a flow of one coulomb per second past a point in a circuit describes a(n)
ampere
