2023 NEC Flashcards
(292 cards)
1
Q
If a dwelling unit has a connected lighting load of 9600 VA, what is the minimum number of 120V, 15A general lighting branch circuits required?
A
6
120V x 15A=1800 VA (1 CKT)
9600 VA / 1800 VA=5.3
2
Q
If a transformer is installed to supply a 243A, 208V, 3-Phase load, the kVA rating of the transformer must be a minimum of__.
A
208V x 1.732 (3 phase) x 243A=87542 VA
87542 VA / 1000=87.5kVA
3
Q
T or F: NEC does not cover installations in ships, aircraft, or underground mines.
A
True
90.2(D)
4
Q
Purpose of this code is the practical __ of persons and property from hazards arising from the use of electricity.
A
Safeguarding
90.2(A)
5
Q
T or F: Permissive rules of this code are those that identify actions that are allowed but not required, are normally used to describe options or alternative methods, and are characterized by the use of the terms shall be permitted or shall not be required.
A
True
90.5(B)
6
Q
Limiting the number of circuits on a single enclosure minimizes the effects from a ground fault or short circuit in one circuit, the NEC provides that the number or circuits and wires in a single enclosure be:
A
Varyingly Restricted
90.8(B)
7
Q
What is the term? Capable of being reached for operation, renewal, and inspection?
A
Accessible(as applied to equipment)
100 DEF
8
Q
What is the term? Capable of being removed or exposed without damaging the building structure of finish or not permanently closed in by the structure or finish of the building.
A
Accessible(as applied to wiring methods)
100 DEF
9
Q
What is the term? Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to take actions such as to use tools( other than keys), to climb over or under, to remove obstacles, or to resort to portable ladders, and so forth.
A
Accessible, Readily
100 DEF
10
Q
What is the term? In amps, the max current, in amps, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
A
Ampacity
100 DEF
11
Q
What is a device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected?
A
Arc-Fault Interrupter (AFCI)
100 DEF
12
Q
What is an organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure?
A
Authority Having Jurisdiction(AHJ)
100 DEF
13
Q
What is the term? Connected to establish electrical continuity and conductivity?
A
Bonded(Bonding)
100 DEF
14
Q
What is a conductor that ensures the required electrical conductivity between metal parts that are required to be electrically connected?
A
Bonding Jumper
100 DEF
15
Q
What is the definition of a Bonding Conductor or Jumper?
A
A conductor for conductivity between parts
100 DEF
16
Q
What is a circuit that supplies two or more receptacles or outlets for lighting and appliances?
A
Branch Circuit, General Purpose
100 DEF
17
Q
A coaxial cable is a cylindrical assembly, usually covered by an insulating jacket, composed of a conductor centered inside a metallic shield or tube, and separated by what kind of material?
A
Dielectric
100 DEF
18
Q
What is the term? A factory assembly of one or more insulated conductors with an integral or overall covering of nonmetallic material suitable for direct burial in the earth.
A
Type UF
100 DEF
19
Q
What is a device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating?
A
Circuit Breaker
100 DEF
20
Q
What is the term? Rendered inaccessible by the structure of finish of the building
A
Concealed
100 DEF
21
Q
What is the term? A load where the max current is expected to continue for 3 hours or more.
A
Continuous Load
100 DEF
22
Q
What is the term? A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
A
Disconnecting Means
100 DEF
23
Q
What is the term? Electrically connected to, or is, a source of voltage.
A
Energized
100 DEF
24
Q
What is the term? All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device.
A
Feeder
100 DEF
25
What is the term? An unintentional, electrically conductive connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metal enclosures, metal raceways, metal equipment, or earth.
Ground Fault
100 DEF
26
What is the term? Connected(connecting) to ground or to a conductive body that extends the ground connection.
Grounded(Grounding)
100 DEF
27
What is a system or circuit conductor that is intentionally grounded?
Grounded Conductor
100 DEF
28
What is a device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a ground-fault current exceeds the values established for a Class A device?
Ground Fault Circuit Interrupter (GFCI)
100 DEF
29
What is a Ground-Fault Circuit Interrupter (GFCI)?
A device to protect personnel that de-energizes a circuit.
100 DEF
30
T or F: Where this code specifies that one equipment shall be "in sight from," "within sight from", or "within sight," and so forth, of another equipment, the specified equipment is to be visible and not more than 15 M (50 FT) distant from the other equipment.
True
100 DEF
31
What is the term? Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction.
Labeled
100 DEF
32
What is the term? Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction.
Listed
100 DEF
33
What is the term? A complete lighting unit consisting of a light source such as a lamp or lamps, together with the parts designed to position the light source and connect it to the power supply.
Luminaire
100 DEF
34
What is the term? A factory assembly of two or more insulated conductors enclosed within an overall nonmetallic jacket.
Nonmetallic-Sheathed Cable
35
What is the term? Requiring human intervention to perform a function.
Nonautomatic
100 DEF
36
What is the term? A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits.
Panelboard
100 DEF
37
What is an enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this code?
Raceway
100 DEF
38
Reconditioned, as defined by the NEC, is also referred to as:
Refurbished
100 DEF
39
What is the term? The conductors and equipment connecting the serving utility to the wiring system of the premises served.
Service
100 DEF
40
What is the term? The overhead conductors between the serving utility and the service point.
Service Drop
100 DEF
41
What is the term? A single conductor or multiconductor assembly provided with or without an overall covering, primarily used for services.
Service Entrance Cable
100 DEF
42
What is the term? The underground conductors between the utility electric supply system and the service point.
Service Lateral
100 DEF
43
What is a large single panel, frame, or assembly, of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments?
Switchboard
100 DEF
44
What is the term? A nominal value assigned to a circuit system for the purpose of conveniently designating its voltage class (e.g., 120/240V, 480Y/277V, 600V)
Voltage, Nominal
100 DEF
45
Conductors normally used to carry current shall of __ unless otherwise provided in the NEC.
Copper, Aluminum, or Copper-Clad Aluminum
110.5 Conductors
46
Conductor sizes are expressed in circular mills or __.
American Wire Gauge (AWG)
110.6
47
Unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment, shall be:
Closed
110.12(A)
48
Connection by means of wire-binding screws or studs and nuts that have upturned lugs or the equivalent shall be permitted for __ AWG or smaller conductors.
10 AWG
110.14(A)
49
The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the __ temperature rating of any connected termination, conductor, or device.
Lowest
110.14(C)
50
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is __ in color.
Orange
110.15
51
Each __ means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident.
Disconnecting
110.22(A)
52
Disconnecting means shall be capable of being__ in the open position.
Locked
110.25
53
Access to and egress from__ shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment.
Working Space
110.26
54
Where rear access is required to work on nonelectrical parts on the back of enclosed equipment, a minimum horizontal working space of __ inches shall be provided.
30 inches
110.26(A)(1)(a)
55
The width of the working space in front of the electric equipment shall be the width of the equipment or __ inches, whichever is greater.
30 inches
110.26(A)(2)
56
For equipment rated 1200 amps or more and over 6 feet wide that contain overcurrent devices, there shall be one entrance to and egress from the required working space not less than __ wide at each end of the working space.
24 inches
110.26(C)(2)
57
For equipment rated 1200 amps or more and over 6 feet wide that contain overcurrent devices, there shall be one entrance to and egress from the required working space not less than __ high at each end of the working space.
6.5 Feet
110.26(C)(2)
58
All service equipment, switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from__.
Damage
110.26(E)
59
The space equal to the width and depth of the equipment and extending from the floor to a height of _ above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation.
6 Feet
110.26(E)(1)(a)
60
Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s) shall be considered accessible to _ persons.
Qualified
110.26(F)
61
Live parts of electrical equipment operating at _ nominal shall be guarded against accidental contact.
50 to 1000 Volts
110.27(A)
62
An insulating grounded conductor _ or larger shall be permitted to be marked with white tape at the time of installation.
4 AWG
200.6(B)
63
The identification of terminals to which a grounded conductor is to be connected shall be mostly _ in color.
White or Silver
200.9
64
For devices with screw shells, the terminal for the _ conductor shall be the one connected to the screw shell.
Grounded
200.10(C)
65
All 125V, single phase, 15 and 20 amp receptacles in dwelling units that installed in _ must have ground fault circuit interrupter protection for personnel. Exceptions ignored.
Bathrooms, Outdoors, Garages, & other accessory buildings with a floor or at below grade
210.8(A)
66
All 125V, single phase, 15 and 20 amp receptacles buildings other than dwelling units that installed in _ must have ground fault circuit interrupter protection for personnel. Exceptions ignored.
Bathrooms, Kitchens, Rooftops
210.8(B)
67
GFCI protection is required for single-phase receptacles rated 150V to ground or less, 50A or less and 3 phase receptacles rated 150V to ground or less, 100A or less that are installed in other than dwelling unit garages, service bays, and similar areas, unless they are in:
Showrooms and vehicle exhibition halls
210.8(B)
68
Sinks where receptacles are installed within _ of the top inside edge of the bowl, require GFCI protection
6 Feet
210.8(A)(8)
69
What total minimum VA shall be included when calculating the demand load for small appliance and laundry circuit loads on a one family dwelling?
4500 VA
1500 x 2(small appliance) + 1500(laundry)=4500 VA
70
All 120V, single phase, 15 and 20 amp branch circuits supplying outlets installed in dwelling unit _ shall be protected by a listed arc-fault circuit interrupter, combination type installed to provide protection of the branch circuit.
Bedrooms
210.12(B)
71
Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch circuit conductor size shall have an allowable ampacity not less than the noncontinuous load plus _ of the continuous load.
125%
210.19(A)(1)
72
For ranges of 8.75kW or more rating, the minimum branch circuit rating shall be _ amps.
40
210.19(C)
73
Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus _ of the continuous load.
125%
210.20(A)
74
T or F: A branch circuit supplies either continuous loads or a combination of continuous and noncontinuous loads, the overcurrent device rating must not be less than 125% of the continuous load added to 100% of the noncontinuous load.
True
210.20(A)
75
What is the maximum rating allowed of any one cord and plug connected appliance connected to a 20A branch circuit?
16
20 x .8 = 16
210.23(B)(1)
76
What is the maximum rating allowed for any single cord and plug connected appliance connected to a 30A rated branch circuit?
24
30 x .8 =24A
210.23(C)
77
Branch circuits larger than _ shall supply only nonlighting outlet loads.
50A
210.23(E)
78
Appliance receptacle outlets installed in a dwelling unit for specific appliances, such as laundry equipment, shall be installed within _ of the intended location of the appliance.
6 Feet
210.50(C)
79
Required 125V, 15 & 20 amp receptacles in dwelling units shall not be located higher than _ above the floor.
5.5 Feet
210.52(4)
80
Required 125V, 15 & 20 amp receptacles in dwelling units shall be installed so that no point measured horizontally along the floor line of any wall space is more than _ from a receptacle outlet.
6 Feet
210.52(A)(1)
81
A required 125V, 15 & 20 amp receptacle in dwelling units shall be installed in any wall space _ or more in width.
2 Feet
210.52(A)(2)
82
Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within _ of the wall.
18 Inches
210.52(A)(3)
83
In the kitchen, pantry, breakfast room, dining room, or similar area of a dwelling unit, receptacles shall be _ .
20A
210.52(B)(1)
84
Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by now fewer than _ small appliance branch circuits.
Two
210.52(B)(3)
85
Countertops and work surfaces in kitchens, pantries, breakfast rooms, dining rooms, and similar dwelling unit areas that are _ or wider are required to be supplied with receptacle outlets.
12 Inches
210.52(C)
86
T or F: Receptacle outlets provided on work surfaces and countertops fulfill the requirements in 210.52(A)(1) and (2).
False
210.52(C)
87
In dwelling units, at least one receptacle outlet shall be installed in bathrooms within _ of the outside edge of each sink.
3 Feet
210.52(D)
88
For dwelling units, at least one receptacle outlet accessible at grade level and not more than _ above grade shall be installed at the front and back of each dwelling.
6.5 Feet
210.52(E)(1)
89
In dwelling units, at least _ receptacle outlets shall be installed for the laundry.
One
210.52(F)
90
For a one family dwelling, at least _ receptacle outlet shall be installed in each basement, attached garage and in detached garages with electric power.
One
210.52(G)
91
In dwelling units, hallways of _ or more in length shall have at least one receptacle.
10 Feet
210.52(H)
92
Guest rooms in hotels, motels, and similar occupancies shall have at least _ receptacle outlets installed that are readily accessible.
Two
210.60(B)
93
At least one receptacle outlet shall be installed within 18 inches of the top of each show window. No point along the top shall be father than _ feet from a receptacle outlet.
6 Feet
210.62
94
One receptacle outlet shall be installed at an accessible location for the servicing of heating, air conditioning, and refrigeration within _ and on the same level as the equipment.
25 Feet
210.63
95
At least one wall switched controlled lighting outlet shall be installed in every _ room, kitchen, laundry area, and bathroom.
Habitable
210.70(A)(1)
96
For dwelling units and garages, at least one wall switch controlled lighting outlet shall be installed to provide illumination on the _ side of outdoor entrances or exits with grade level access.
Exterior
210.70(A)(2)
97
Interior stairs with lighting outlets shall have switches at each end, where the stairway between floor levels has _ risers or more.
Six
210.70(A)(2)
98
For attics, underfloor spaces, utility rooms, and basements, at least one lighting outlet containing a switch or controlled by a wall switch shall be installed at or _ any equipment requiring servicing.
Near
210.70(C)
99
For circuits supplying loads consisting of motor operated utilization equipment that is fastened in place and has a motor larger than 1/8 HP in combination with other loads, the total computed load shall be based on _ of the largest motor load plus the sum of the other loads.
125%
220.11(A)
100
The total calculated load for circuits supplying loads made up of motor operated utilization equipment fastened in place that has a motor larger than _ HP in combination with other loads, will be based on 125% of the largest motor load and the sum of the other loads.
1/8 HP
220.11(A)
101
The calculated load or circuits supplying lighting units that have autotransformers, ballasts, or transformers will be based on:
Total ampere ratings of units and not total watts of the lamps
220.11(B)
102
The load for an electric sign or outline lighting system should be computed at a minimum of _ VA when sizing the service calculation
1200
220.14(F)
103
Show windows must be calculated either at 200VA per _ of show window, or the unit load per outlet as required in other provisions of Article 220.14
1 linear foot
220.14(G)
104
What is the minimum VA per outlet for general purpose receptacle loads, before taking demand factors into consideration for commercial buildings.
180 VA
220.14(I)
105
General lighting in dwelling units is required to have a unit load of at least _ VA
3VA
220.41
106
T or F: No additional loads calculations are required for general use receptacle outlets of 20A or less, lighting outlets, and receptacle outlets specified in 210.52(E) and (G)
True
220.41
107
The general lighting load and receptacle load for a 2400 sq. ft dwelling unit would be:
7200VA
2400 x 3VA = 7200
220.41
108
What is the maximum footage an office building could have with a calculated lighting load of 24,500VA?
18,800 sq. ft.
24500 / 1.3 = 18846
220.42
109
If a warehouse area is 10,000 square feet for storage and uses high pressure sodium lighting, what is the maximum lighting load?
8,333
10000 / 1.2 = 8333.33
220.42
110
If a warehouse uses mercury vapor lighting in the storage area, and the storage area is 40,500 square feet of space, what is the minimum lighting load?
33,750 VA
40500 / 1.2= 33750
220.42
111
The lighting demand factor of the first 3000 VA or less in dwelling units is _ %.
100%
220.45
112
For track lighting in other than dwelling units or guest rooms of hotels or motels, an additional load of _ VA shall be included for every 2 feet of lighting track or fraction thereof.
150
220.46(B)
113
In each dwelling unit, the load shall be computed at _ VA for each 2 wire small appliance branch circuit required.
1500
220.52(A)
114
In each dwelling unit, if the small appliance load is subdivided between two or more feeders, the calculated load for each will include at least _ for each 2 wire small appliance branch circuit.
1500 VA
220.52(A)
115
A load of not less than _ VA shall be included for each 2 wire laundry branch circuit installed as required.
1500
220.52(B)
116
A load for laundry circuits of at least 1500 VA must be included for each 2 wire laundry branch circuit installed, and this load is allowed to be included with the _ load and subject to the demand factors designated in T.220.42
General lighting
117
If they are served by the same feeder or service in a one family, two family, or multifamily dwelling, is is allowable to apply a demand factor of 75% to the nameplate rating load of _ or more appliances fastened in place, other than air conditioning equipment, clothes dryers, electric ranges , or space heating equipment.
Four
220.53
118
What is the allowed demand factor to be applied to the nameplate rating load of four or more fastened in place water heaters placed in a multifamily dwelling unit, when apply the standard calculation method for dwellings?
75%
220.53
119
The load for household electric clothes dryers in a dwelling unit(s) shall be 5000 watts (VA) or the _ , whichever is larger for each dryer served
Nameplate rating
220.54
120
In a multifamily dwelling unit, what is the demand factor percentage for 9 household electric clothes dryers?
55%
220.54
121
What is the minimum watts (VA), other than nameplate rating(whichever is larger) clothes dryers are to be calculated at when doing residential feeder and service calculations.
5000
220.54
122
The load of EVSE must be calculated for _ watts(VA) or the equipment nameplate rating, whichever is larger.
7200
220.57
123
Where is is unlikely that two or more noncoincident loads will be in use simultaneously, using only the _ load(s) that will be used at one time, in computing the total load of a feeder or service shall be permitted.
Largest
220.60
124
If each unit in a 12 unit condo had an 8kW electric range, applying the optional method of calculation for multifamily dwellings, what would the calculated demand load be on the ungrounded (line) service entrance conductors for the electric ranges?
39.4 kW
220.84(A)
125
Overhead conductors for festoon lighting shall not be smaller than _ unless the conductors are supported by messenger wires.
12 AWG
225.6(B)
126
Overhead spans of open conductors and open multiconductor cables shall be _ over residential property and driveways where the voltage does not exceed 300 volts to ground.
12 Feet
225.18
127
Final spans to buildings shall be permitted to be attached to the building, but they shall be kept not less than _ from windows that are designed to be opened.
3 Feet
225.19(D)(1)
128
If an underground raceway enters a building or structure, it must be _ with an appropriate material.
Sealed
225.27
129
Means shall be provided for _ all underground conductors that supply or pass through a building or structure.
Disconnecting
225.31(A)
130
The disconnecting means shall be at a _ accessible location nearest the point of entrance of the conductors.
Readily
225.31(B)
131
There shall be no more than _ disconnects per supply grouped in any one location.
Six
225.33(A)
132
Each disconnect shall be marked to indicate the _ served.
Load
225.34(A)
133
In a multiple occupancy building, each occupant shall have _ to the occupants supply disconnecting means.
Access
225.35
134
Each building or structure disconnecting means shall _ disconnect all ungrounded supply conductors that it controls from the building or structure wiring system.
Simultaneously
225.38(B)
135
For installations to supply only limited loads of a single branch circuit, the branch circuit disconnecting means shall have rating of not less than _
15 Amps
225.39(A)
136
For installations consisting of not more than two 2 wire branch circuits, the feeder or branch circuit disconnecting means shall have a rating of not less than _
30 amps
225.39(B)
137
For a one family dwelling, the feeder disconnecting means shall have a rating of not less than _ , 3 wire.
100 amp
225.39(C)
138
A building or other structure served shall be supplied by only _ service.
One
230.2
139
Circuit conductors other than service conductors shall not be _ in the same raceway, cable, handhole enclosure, or underground box as the service conductors. or service cable
Installed
230.7
140
Overhead service drop conductors shall not be smaller than _ copper.
8 AWG
230.23(B)
141
Overhead service drop conductors shall have a vertical clearance of not less than _ above the roof surface.
8.5 Feet
230.24(A)
142
In no case shall the point of attachment for overhead service drop conductors be less than _ above finished grade.
10 Feet
230.26
143
T or F: A set of service entrance conductors on the supply side of a normal service disconnecting means is allowed to be the supply for fire and sprinkler alarms, fire pump equipment, and standby power systems as detailed in Section 230.82, Equipment connected to the supply side of the service disconnect.
True
230.40
144
Service entrance cables shall be supported by straps or other approved means within _ of every service head, gooseneck, or connection.
12 Inches
230.51(A)
145
Service entrance cables shall be supported by straps or other approved means at intervals not exceeding _ inches.
30
230.51(A)
146
Overhead and service entrance conductors must be arranged to prevent the entry of _ into the service equipment or raceway.
Water
230.54(G)
147
All areas of nursing homes and limited care facilities used exclusively as patient sleeping rooms, dormitory units, dwelling units, and guest rooms or suites of hotels and motels must be provided with:
Surge Protecting Devices
230.67(A)
148
Service disconnecting means shall not be installed in _ .
Bathrooms
230.70(A)(2)
149
T or F: Emergency disconnects for one and two family dwelling units must be either within sight or in a readily accessible outdoor location.
True
230.85(A)(1)
150
Plug fuses of the Edison base type shall be classified at not over 125V & _ and below.
30 amps
240.51(A)
151
Circuit breakers used as _ in 120V and 277V fluorescent lighting circuits shall be listed and shall be marked SWD or HID
Switches
240.83(D)
152
T or F: Surge arresters shall be permitted to be located indoors or outdoors.
True
242.46
153
Electrical systems that are _ shall be connected to earth in a manner that will limit the voltage imposed by lighting, line surges, or unintentional contact with higher voltage lines and that will stabilize the voltage to earth during normal operation.
Grounded
250.4(A)(1)
154
Normally non current carrying conductive materials enclosing electrical conductors or equipment shall be connected together, and to the electrical supply source, in a manner that establishes an effective _ current path.
Ground Fault
250.4(A)(3)
155
The earth shall not be considered an _ ground fault current path.
Effective
250.4(A)(5)
156
Sheet metal screws shall not be permitted to be used to connect _ conductors or connection devices to enclosures.
Grounding
250.8(A)
157
If ground clamps and fittings are exposed to physical damage, they must be enclosed in _ or an equivalent protective coating.
Metal or Wood
250.10
158
Nonconductive coatings, (such as paint, lacquer, and enamel) on equipment to be grounded shall be _ from threads and other contact surfaces to ensure good electrical continuity.
Removed
250.12
159
Unless otherwise allowed in article 250.24, is is not allowed to connect a grounded conductor to equipment grounding conductor(s), to normally noncurrent carrying metal parts or equipment, or be reconnected to ground on the load side of a:
Service Disconnecting Means
250.24(B)
160
Where the service entrance phase conductors are installed in parallel, in two or more raceways, the size of the grounded conductor in each raceway shall not be smaller than _ AWG
1/0 AWG
250.42(D)(2)
161
Where a main bonding jumper is a screw only, the screw shall be identified with a _ finish that shall be visible with the screw installed.
Green
250.28(B)
162
An metal underground water pipe in direct contact with the earth for _ or more may be allowed to be used for grounding.
10 Feet
250.52(A)(1)
163
An electrode encased by at least 2 inches of concrete shall be permitted to be 20 feet of bare copper conductor not smaller than _ AWG
4 AWG
250.52(A)(3)
164
An ground ring encircling the structure, in direct contact with the earth, at least 20 feet of bare copper conductor, must be at least _.
2 AWG
250.52(A)(4)
165
Rod and pipe electrodes must be at least _ in length.
8 Feet
250.52(A)(5)
166
What may not be used for grounding electrodes?
Aluminum electrodes and metal underground gas piping systems
250.52(B)
167
A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of _ or less shall not be augmented by an additional electrode.
25 ohms
250.53(A)(2)
168
If multiple rod, pipe, or plate electrodes are installed to meet the grounding requirements shall not be less than _ apart.
6 Feet
250.53(A)(3)
169
When using rod and pipe electrodes, where rock bottom is encountered, the electrode shall be driven at an oblique angle not to exceed _ from the vertical
45 Degrees
250.53(A)(4)
170
Plate electrodes shall be installed at least _ below the surface of the earth.
30 Inches
250.53(A)(5)
171
If more than one, rod and pipe or plate, electrode are used, each electrode of one grounding system shall not be less than _ from any other electrode of another grounding system.
6 Feet
250.53(B)
172
Where the supplemental electrode is a rod, pipe, or electrode, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than _ copper wire
6 AWG
250.53(E)
173
Where used outside, aluminum or copper-clad aluminum grounding electrode conductors shall not be terminated within _ of the earth.
18 Inches
250.64(A)
174
All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be _.
Accessible
250.68(A)
175
The terminal for the connection of the equipment grounding conductor on wiring devices ( receptacles, switches, etc.) shall be a _ screw with a hexagonal head.
Green
250.126(1)
176
Direct metal to metal contact between the device yoke and the box may _ the receptacle to a box, if the metal box is mounted on the surface.
Ground
250.146(A)
177
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 _.
Raceway
300.3(B)
178
Where subject to physical damage, conductors, raceways and cables shall be _.
Protected
300.4
179
Where a cable or raceway type wiring method is installed through bored holes in joists, rafters, or wood members, holes hall be bored so that the edge of the hole is not less than _ from the edges of the wood member.
1.25 Inches
300.4(A)(1)
180
Direct burial cables or conductors shall have a minimum cover of _ to finished grade.
24 inches
T.300.5
181
What is the minimum ground cover required when installing a 20 amp, 120V GFCI protected, direct buried branch circuit, using type UF cable to supply landscape lighting for a residence.
12 Inches
T.300.5
182
Raceways installed in solid rock shall be permitted to be buried at lesser depths than required where covered by _ of concrete, which shall be permitted to extend to the rock surface.
2 Inches
T.300.5
183
Direct buried conductors emerging from grade and specified in columns 1 and 4 of Table 300.5(A) shall be protected extending from the minimum cover required below grade to a point at least _ above finished grade.
8 Feet
300.5(D)
184
Underground service conductors that are not encased in concrete and that are buried 18 Inches or more below grade shall have their location identified by a warning ribbon that is placed in the trench at least _ above the underground installation.
12 Inches
300.5(D)(3)
185
Direct buried conductors or cables shall be _ to be spliced or tapped without the use of splice boxes.
Permitted
300.5(E)
186
If a raceway containing power-limited, remote control, and signaling circuits circuits is where condensation is a known problem is subjected to different temperatures, the raceway must be filled with material to prevent the circulation of warm air to a colder section of the raceway, approved by the authority having jurisdiction. Explosionproof seals:
Are not required for this purpose
300.7(A)
187
Cables and raceways shall not be _ ceiling grids.
Supported by
300.11(B)
188
In multiwire branch circuits, the continuity of a _ conductor shall not depend on device connections such as lampholders, receptacles, and so forth.
Grounded
300.13(B)
189
At least _ of free conductor shall be left at each outlet, junction, and switch point for splices or the connections of luminaires or devices.
6 Inches
300.14
190
The number and size of conductors and cables in any raceway shall not be more than what will permit dissipation of the _ and ready installation or withdrawal of the conductors or cables without damage to the conductors or cables, or to their insulation.
Heat
300.17
191
For multiconductor or multiplexed single conductor cables having individually shielded conductors, the minimum bending radius shall be _ the diameter of the individually shielded conductors or 7 times the overall diameter, whichever is greater.
12 Times
305.5
192
Minimum conductor size for voltage ratings up to and including _ is 14 AWG copper and 12 AWG aluminum or copper clad aluminum.
2000 Volts
310.3(A)
193
Aluminum, copper clad aluminum, or copper conductor, grounded conductor, or neutral conductor shall be permitted to be connected in parallel (electrically joined at both ends) only in sizes _ and larger
1/0 AWG
310.10(G)(1)
194
Where more than one ampacity supplies for a given circuit length, the _ value shall be used.
Lowest
310.14(A)(2)
195
T or F: For the purposes of applying adjustment factors, current carrying conductors of a paralleled set of conductors must be counted as a current carrying conductor.
True
310.15(C)(1)
196
Where 10-20 current carrying conductors are installed in the same raceway the ampacity of each conductor shall be reduced _ percent.
50%
310.15(C)(1)
197
Conductors in enclosures for switches or overcurrent devices shall not fill the wiring space at any cross section to more than _ of the cross sectional area of the space.
40%
312.8(A)
198
_ boxes shall not be used where conduit or connectors requiring the use of locknuts or bushings are to be connected to the side of the box.
Round
314.2
199
All metal boxes shall be _ and bonded.
Grounded
314.4
200
For an octagon box with 6 No. 12 wires entering and terminating in it, 3 grounding conductors terminating in it, a fixture stud and 3 entry clamps inside, how much free space is required, in cubic inches?
No. 12- 2.25 x 6=13.5 Cu.In
3 grounding conductors- 2.25 x 3= 6.75 Cu.In
13.5+6.75=20.25 Cu. In
201
When calculating box fill requirements, each conductor that originates outside the box and terminates or is spliced within the box shall be counted _.
Once
314.16(B)(1)
202
The volume allowance required for each 14 AWG conductor, when calculating box fill, shall be _ cubic inches.
2.0
T.314.16(B)
203
Size 12 AWG THWN copper conductors, for the purpose of determining box fill, are calculated at what volume per conductor?
2.25
T.314.16(B)
204
For the purposes for calculating conductor fill in a box, each coil or loop of unbroken conductor at least twice the minimum lengths necessary for free conductors gets counted:
Twice
314.16(B)(1)
205
Based on the largest conductor connected to the switch, for the purpose of determining conductor fill in a device box, how many conductors(s) is a 3-way switch counted as equal to?
Two
314.16(B)(4)
206
A volume allowance of _must be made for each yoke or strap based on the largest conductor connected to a device or piece of equipment that is supported by that strap or yoke, for each yoke or strap containing one or more devices or equipment.
314.16(B)(4)
207
Within or behind a surface of concrete, tile, gypsum, plaster, or other noncombustible material, boxes shall be installed so that the front edge of the box will not be set back of the finished surface more than _ inch.
.25 Inch
314.20
208
Outlet boxes that do not enclose devices or utilization equipment shall have a minimum internal depth of _ inch.
1/2 Inch
314.24(A)
209
If a luminaire weighs more than _ , unless the outlet box is listed for the weight to be supported, it must be supported independently of the outlet box.
50 pounds
314.27(A)(1)
210
Where permanent barriers are installed in a box, each section shall be considered as a _ box.
Separate
314.28(D)
211
Where NOT subject to _ , Type MC cables shall be permitted for services, feeders, and branch circuits.
Physical Damage
330.10(A)
212
Type MC cables containing four or fewer conductors, sized no larger than 10 AWG, shall be secured within _ of every box, cabinet, fitting, or other cable termination.
12 Inches
330.30(B)
213
T or F: Type NM cable may be installed in dropped or suspended ceilings in other than one and two family and multi family dwellings as an open run.
False
334.12
214
Bends in Types NM and NMC cable shall be made so that the cable will not be _.
Damaged
334.24
215
Nonmetallic-sheathed cable shall be secured by staples, cable ties, straps, hangers, or similar fittings at intervals not exceeding _ feet.
4.5 Feet
334.30
216
The ampacity of Types NM and NMC cable shall be determined in accordance with the _ (140 F) conductor temperature rating.
60 Degree
334.80
217
T or F: Connections at couplings for IMC should not use running threads.
True
342.42(B)
218
EMT smaller than _ shall not be used.
1/2 Inch
358.20(A)
219
There shall not be more than a total of _ bends between pull points, for example, conduit bodies and boxes.
360 Degrees
358.24(B)
220
EMT shall be securely fastened in place in intervals not to exceed _ feet.
10 Feet
358.30(A)
221
EMT shall be permitted as an equipment _ conductor.
Grounding
358.60
222
The sum of the cross sectional areas of all contained conductors at any cross section of a sheet metal auxiliary gutter shall not exceed _ of the interior cross sectional area of the sheet metal auxiliary gutter.
20%
366.22(A)
223
Conductors, including splices and taps, shall not fill a gutter to more than _ of its area.
75%
366.56(A)
224
Busways shall be securely supported at intervals not exceeding _ unless otherwise designed and marked.
5 Feet
368.30
225
Conductors installed in surface metal raceways where the cross sectional area is more than 4 sq. in. _ , and the total cross sectional area of all conductors is not more than 20% of the interior cross sectional area of the raceway, do not require ampacity adjustment factors as detailed in section 310.15(C)(1)
Current carrying conductors do no exceed 30 in number
386.22
226
T or F: Flexible cables, flexible cord sets and power supply cords shall not be run through holes in walls , structural ceilings, suspended ceilings, dropped ceilings, or floors.
True
400.12
227
Fixture wires shall not be smaller than _ AWG.
18 AWG
402.6
228
3-way and 4-way switches shall be so wired that all switching is done:
Only in the ungrounded circuit conductors.
404.2(A)
229
Switches or circuit breakers shall not disconnect the _ conductor of a circuit.
Grounded
404.2(B)
230
All switches and circuit breakers used as switches shall be located so the operating handle, when in its highest position, is not more than _ above the floor or working platform. (Exceptions ignored)
6 Ft. 7 In.
404.8(A)
231
General use dimmer switches shall be used only to control permanently connected loads such as _ luminaires.
Incandescent
404.14(F)
232
Receptacles incorporating an isolated grounding conductor connection, shall be identified by an _ triangle located on the face of the receptacle.
Orange
406.3(E)
233
Receptacles installed on 15 and 20 amp branch circuits shall be of the _ type.
Grounding
406.4(A)
234
A _ type receptacle must be used where a grounding means exists in the receptacle enclosure or an equipment grounding conductor is installed.
Grounding
406.4(D)(1)
235
Receptacles shall not be installed in a _ position in countertop surfaces or work surfaces.
Face Up
406.5(G)(1)
236
Receptacles installed outdoors in a wet location shall have an enclosure that is _ whether or not attachment attachment plug cap is inserted.
Weatherproof
406.9(B)(1)
237
A receptacle shall not be installed within or directly over a _ .
Bathtub or shower stall
406.9(C)
238
T or F: Tamper-resistant receptacles are required in all dwelling units.
True
406.12
239
The B phase shall be that phase having the _ voltage to ground on 3 phase, 4 wire, delta-connected systems.
Higher
408.3(E)(1)
240
If a panelboard is used with nonmetallic raceway or cable, or where separate equipment grounding conductors are supplied, a _ for the equipment grounding conductors must be secured inside the cabinet.
Terminal Bar
408.40
241
Where conduits enter a switchboard or floor standing panelboard at the bottom, the conduit including their end fittings, shall not rise more than_ above the bottom of the enclosure.
3 Inches
408.5
242
T or F: Switchboards that have any exposed live parts shall be located in permanently dry locations and then only where under competent supervision and accessible only to qualified persons.
True
408.20
243
Each grounded conductor shall terminate within the panelboard in an _ terminal that is not also used for another conductor.
Individual
408.41
244
No parts of cord connected luminaires, hanging luminaires, lighting track, pendants, or ceiling suspended fans shall be located within a zone measured _ horizontally from the top of the bathtub rim or shower stall threshold.
3 Feet
410.10(D)(1)
245
Surface mounted incandescent luminaires installed on the wall above the door or on the ceiling in clothes closets shall have a minimum clearance of _ between the luminaire and the nearest point of storage.
12 Inches
410.16(D)
246
A luminaire that exceeds _ in any dimension shall not be supported by the screw shell of a lampholder.
16 Inches
410.30(A)
247
If a metal pole is less than _ in height, then a handhole is not required.
8 Feet
410.30(B)(1)
248
It is required to connect lighting equipment and luminaires to a:
Equipment grounding conductor
410.40
249
__ conductors shall be used for wiring on luminaire chains and on other movable or flexible parts.
Stranded
410.56(E)
250
Luminaires shall not be used as a _ for circuit conductors.
Raceway
410.64
251
Thermal insulation shall not be installed above a recessed luminaire or within _ of the recessed luminaires enclosure, wiring compartment, or ballast unless it is identified for contact with insulation, Type IC.
3 Inches
410.116(B)
252
Heavy duty lighting track is lighting track identified for use exceeding _ amperes.
20
410.153
253
A single section (of track for lighting) 4 feet or shorter in length shall have _ supports.
Two
410.154
254
The length of cord for electrically operated kitchen waste disposers shall not be over _ inches.
36 Inches
422.16(B)(1)
255
The length of cord for built in dishwashers shall not be less than _ feet.
3
422.16(B)(2)
256
Ceiling suspended fans shall be supported _ of the outlet box.
Independently
422.18(A)
257
For permanently connected appliances rated at not over_ HP, the branch circuit overcurrent device shall be permitted to serve as the disconnecting means.
1/8
422.31(A)
258
What is the maximum rating on a branch circuit supplying more than one electric baseboard heater in a residential occupancy?
30 Amps
424.4(A)
259
GFCI protection for personnel shall be provided for cables installed in electrically heated _ of bathrooms, kitchens, and in hydromassage bathtub locations.
Floors
424.44(E)
260
Fixed outdoor electric deicing and snow melting equipment shall be considered as a _ load.
Continuous
426.4
261
The disconnecting means for motor circuits rated 1000V nominal, or less, must have a current rating of at least _ of the full load current rating of the motor.
115%
430.110(A)
262
Flexible metal conduit or liquidtight flexible metal conduit not exceeding _ in length shall be permitted to be employed for raceway connection to a motor terminal enclosure.
6 Feet
430.203
263
Disconnecting means shall be located within sight of and _ from A/C or refrigerating equipment.
Readily Accessible
440.14
264
A/C and refrigerating equipment disconnecting means must be:
Located within sight
440.14
265
The total marked current rating of a cord and attachment plug connected room air conditioner shall not exceed _ of the current rating of a branch circuit where no other loads are supplied.
80%
440.62(B)
266
Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed _ for a nominal 120V rating.
10 Feet
440.64
267
Who determines the classification of hazardous areas and zones?
Qualified persons
505.7(A)
268
If ventilation is not provided for a pit, belowgrade work area, or subfloor work area of a minor repair garage, the location is considered:
Class 1, Division 2
511.3(C)
269
Field installed terminals used for grounding and bonding for swimming pools, identified for use in wet locations and corrosive environments must be listed for _ use and made of copper, copper alloy, or stainless steel.
Direct burial
680.7(C)
270
T or F: Except as modified by Article 517, wiring used in health care locations are required to comply with the provisions of Chapter 1 through 4 of the NEC.
True
517.12
271
What is required for the installation of wiring for the essential electrical system in patient care areas of hospitals?
Nonflexible metal raceways
517.31(C)(3)
272
What is the maximum load that may be carried by branch circuits for luminaires installed as border lighting for stages in theaters?
20 amps
520.41(A)
273
What is the maximum number of maps that a branch circuit supplying a neon tubing installation should have?
30 amps
600.5(C)(1)
274
T or F: Wiring methods that supply a sign enclosure or cabinet must terminate inside or outline lighting system enclosure.
True
600.5(D)(1)
275
What is the maximum distance from any section of the sign display for the disconnecting means to be from electric signs or outline lighting systems?
50 Feet
600.6(A)(2)
276
The metal equipment of signs, _ , and skeleton tubing systems must be grounded by connection to the equipment grounding conductor of the supply branch circuit of feeder that uses the types of equipment grounding conductors detailed in Section 250.118, Types of equipment grounding conductors.
Outline lighting
600.7(A)(1)
277
To prevent the possibility of _ , amplifiers, loudspeakers, and other equipment must be located or protected against environmental exposure or physical damage.
A fire, shock, personal hazard
640.4
278
The short circuit current rating of transfer equipment for emergency systems, based on specific overcurrent protective devices types and settings for the transfer equipment, must be field marked on the transfer equipment's:
Exterior
700.5(F)
279
In emergency circuits, branch circuit overcurrent devices are accessible only to:
Authorized persons
700.30
280
A legally required standby system must have rating and capacity sufficient for how much of the loads expected to operate at the same time on the standby system?
100% of the loads
701.4(B)
281
An optional standby system that uses automatic transfer equipment must have rating and capacity sufficient for the supply of:
The full load
702.4(A)(2)
282
The temporary connection of a portable generator without transfer equipment may be allowed for standby systems, provided that maintenance and supervision make certain that only qualified persons service the installation, and the normal supply is physically isolated by:
A lockable disconnecting means or the disconnection of the normal supply conductors.
702.5(A)
283
T or F: A bushing must be installed where cables emerge from a raceway used for protection or support of such cables for fire alarm circuits.
True
760.3(K)
300.15(C)
284
T or F: The disconnecting means for a fire alarm branch circuit is allowed to be secured in the "on" position.
True
760.12(B)
285
Contaminants such as abrasives, cleaners, _ paint, or plaster, may alter communications wire and cable properties in an undetermined way.
Corrosive residues
800.24(A)
286
What is the minimum separation for overhead communications wires and cables at any point in the span from supply service drops of up to 750V?
12 Inches
800.44(A)(4)
287
What is the minimum separation that shall be maintained, where practicable, between lighting conductors and communications wires and cables on buildings?
6 Feet
800.53
288
Which article has the requirements for the installation of wiring for radio and television receiving equipment, including amateur/citizen band radio equipment antennas and digital satellite receiving equipment for television signals?
810
810.1
289
What is the maximum cross sectional value that conduit nipples under 24 inches long may be filled?
60%
Ch.9 Tables Notes to Table(4)
290
A 2" EMT using a One Shot bender has a minimum bending radius of:
9.5 Inches
Ch.9 Table 2 Radius of Conduit and Tubing Bends
291
What is the minimum allowable trade size IMC required to contain a total of ten(10) copper THW conductors in a 20 foot run, five(5) size 1 AWG and five(5) size 3 AWG?
2.5 Inches
1 AWG THW= .1901 sq. in. x 5 = 0.9505
3 AWG THW= .1134 sq. in. x 5 = 0.537
Total= 1.5175 sq. in.
292
What is the approximate diameter, on No. 2 RHW wire in inches?
0.472
Ch.9 Tables, Table 5
