iec year 2 part 2
What is the maximum allowable voltage between conductors on a branch circuit supplying lighting fixtures (luminaires) in a residence?
120 volts
In Figure 210.8 the busbars in Panel I are ___ conductors.
feeder
Compliance with the provisions of the Code will result in ___.
freedom from hazard
The Code rules and provisions are enforced by ___.
government bodies exercising legal jurisdiction over electrical installations
Service equipment shall have an ampere interrupting rating (AIR) ___ the fault current available at the service location.
greater than or equal to
A continuous white or natural gray covering on a conductor shall be used only for the ___ conductor.
grounded
No grounded interior wiring shall be electrically connected to a supply system unless the supply system contains a corresponding conductor which is ___.
grounded
NEC® Section 110.9 requires that electrical equipment ___.
intended to interrupt fault current be so rated
Refer to the nameplate shown in Figure 233.135. A nonfused safety switch with a voltage rating of 600 volts ___ to be used as the disconnecting means for this unit.
is permitted
AFCI protection ___ when a 10-foot branch circuit extension is added to a dwelling family room per the NEC®.
is required
Soldered splices must be ___ so as to be electrically secure before soldering.
joined mechanically
A(n) ___ is a box that contains branch circuit conductors that are connected to a luminaire.
lighting outlet
Unused openings in panelboards can be closed using ___.
listed fillers
The ___ connects the equipment grounding conductors to the grounded (neutral) conductors.
main bonding jumper
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions is considered ___.
rainproof
The Code applies to the installation of electrical conductors, equipment and raceways in which of the following?
recreational vehicles
Any electrical circuit that controls any other circuit through a relay or an equivalent device is a ___.
remote control circuit
The authority having jurisdiction has the responsibility ___.
all of these
To assure an electrically safe work condition when working on switchboards and panelboards, the power supplying switchboards or panelboards must be turned off and all ___ procedures must be followed.
all of these
A unit of an electrical system, other than a conductor, that carries or controls electric energy as its principal function is referred to as a(n) ___.
device
A(n) ___ is a device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
disconnecting means
The NEC® considers an installation inside a building to be a ___ location.
dry
NEC® Section ___ states the following. Conductors of dissimilar metals shall not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as copper and aluminum, copper and copper-clad aluminum, or aluminum and copper-clad aluminum), unless the device is identified for the purpose and conditions of use.
110.14
Refer to Figure 130.107. The fewest number of AFCI circuit breakers that are required to be installed in Panel B is ___.
14
A duplex receptacle installed on a 20-ampere branch circuit shall have a minimum ampere rating of ___.
15
A single receptacle installed on a 20-ampere 120-volt circuit shall have an ampere rating of ___.
20
The NEC® requires two separate ___-ampere receptacle branch circuits for kitchens because cord-connected appliances used in residential kitchens (such as coffee makers, toasters, microwave ovens, and slow cookers) use a lot of current.
20
Where contained in a cable, the Code reference that states when a conductor with white insulation may be used as an ungrounded circuit conductor is in Section ___.
200.7(C)
The requirements for the minimum number of branch circuits in a dwelling is found in ___.
210.11
Arc-fault requirements for dwelling units are found in Section ___.
210.12
Guest suites of hotels with permanent cooking provisions shall be required to have AFCI protection for the bedrooms according to ___ in the NEC®.
210.12(C)
In dwelling units, receptacles supplying countertops in the dining room shall be installed so that no point along the wall is more than ___ inches to the nearest receptacle.
24
Round access openings in a manhole shall not be less than ___ inches in diameter.
26
Refer to Figure 201.15. The minimum working clearance at Point Z is ___ feet. The panel is 120 /208-volt, 3Ø, 4W.
3
The Code recommends a voltage drop no greater than ___ percent for feeders and no greater than ___ percent total for feeders and branch circuits together.
3 5
A load center is mounted to the wall. The height of the panel is 24 inches. The width of the panel is 18 inches. What is the required width of the working space in front of the panel?
30 inches
The minimum working clearance at Point X in Figure 201.15 is ___ feet. The panel is 277/480-volt, 3Ø, 4W.
31/2
For the 120/208-volt panelboard shown in Figure 201.18, the minimum width of the working space directly in front of the panelboard is ___.
34 inches
Which enclosure type would be suitable for indoor use which is subject to splashing water?
4
Unless specified otherwise, live parts of electrical equipment operating at ___ volts or more shall be guarded.
50
In a single-family dwelling the receptacles shall be installed so that no point measured along the floorline is more than ___ ft. to the nearest outlet.
6
The minimum headroom of the clear working space in front of a panelboard shall extend to ___ feet above the floor or the height of the panelboard, whichever is higher.
6'-6"
Refer to Figure 201.20. The tops of both panel cans are at the same height above the floor. The bottom of the 277/480-volt panel is at 38" AFF. The ceiling height can be no less than ___ AFF.
7'-2"
Which chapters in the NEC® apply generally unless modified by latter chapters?
Chapters 1 through 4
Which chapters in the Code apply generally?
Chapters 1-4
A 1200-A fused safety switch is installed in a room with two personnel doors. These doors are required to ___. I. be equipped with panic hardwareII. open in the direction of egress from the roomIII. open in the direction of entrance to the room
I & II only
The ___, or other descriptive marking by which the organization responsible for the product may be identified, shall be placed on all electric equipment.I. trademark II. cost III. manufacturer's name
I and III only
Where installed in conduit, the following colors of insulation or marking are permitted to identify "hot" phase conductors. I. black, red, and blue II. brown, orange, and yellow III. pink, black, and blue
I or II or III
A ___-volt circuit is permitted to supply the auxiliary equipment (ballasts for example) of HID luminaires where installed outdoors on 24-foot poles. All voltage systems are grounded.I. 277 II. 120 III. 480 IV. 208
I, II, III or IV
Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, the means of identification of each system phase conductor, wherever accessible, may be by ___. I. tagging, or other equally effective means II. marking tape III. separate color coding
I, II, or III
. What conductor in a circuit cannot be marked with a color of white or gray?I. grounded II. equipment grounding III. ungrounded
II & III only
The grounded conductor of a branch circuit that is 6 AWG or smaller shall be ___.I. without splices II. white or gray in color
II only
In your home, Circuit 22 supplies the upper half and Circuit 24 supplies the lower half of a duplex receptacle. These breakers are permitted to be ___. I. two individual single-pole circuit breakersII. two individual single-pole circuit breakers with handle tiesIII. a two-pole circuit breaker
II or III only
Where a 120/240-volt, 1Ø, 3-wire multiwire branch circuit is connected to a "split-wired" duplex receptacle in a barber shop, the branch-circuit OCPD/disconnect is permitted to be ___. I. two single-pole circuit breakers without handle ties II. two single-pole circuit breakers with identified handle ties III. a 2-pole circuit breaker
II or III only
The NEC® and ___ require that all switchboards, panelboards and industrial motor control panels shall be field marked to warn qualified persons of arc flash hazards.
NFPA70E
Is the conduit between the street lighting poles covered by the NEC®? The street lighting and conduit were installed in the utility easement as shown in the drawing at the right and is under the control of the utility company.
No
You need to get power to a 208-volt load. Your available power is from a 120/240-volt, 3Ø, 4-wire panelboard. Is it permitted for you to run a branch circuit from the neutral bar and a 1-pole circuit breaker installed in breaker space #4? The CB has a 120-volt rating.
No
What is the point on a wiring system called that takes current to supply utilization equipment?
Outlet
The qualified person must also have knowledge in the selection and proper care and use of ___ and other safety equipment and tools.
PPE
Which of the statements below is an example of mandatory language used in the NEC®?
Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.
In a dwelling, a single receptacle installed for the cord connection to a dishwasher located 2 feet from a kitchen sink but below a countertop requires GFCI protection.
True
The white conductor contained in a 12/2 with ground MC cable can be marked with purple tape where visible or accessible and used for a traveler from a 3-way switch.
True
When installing panelboards or switchboards, you must follow all manufacturer's installation requirements.
True
What is an acceptable color for the grounded conductor?
White
Are smoke detectors in residential bedroom areas required to have AFCI protection?
Yes
Examples of raceways would include ___.
all of these
Where one or more complete paragraphs from the previous edition of the NEC® have been deleted in the current edition, the deletion is identified by ___ between the remaining paragraphs.
a bullet ( • )
An insulated grounded conductor 6 AWG or smaller can not be identified by ___.
a conductor with a continuous red outer finish phased with white tape at the termination points
A residential kitchen plan view is shown in Figure 201.62. Which receptacles are required by the NEC® to be GFCI protected?
all except 2, 3, 4, 5 & 7
A non-dwelling kitchen plan view is shown in Figure 201.62. Which receptacles are required by the NEC® to be GFCI protected? The range receptacle is 50A and the ovens receptacle is 60A.
all except 5
Branch circuits that serve a ___ are required to be rated at 20 amperes where installed in a house.
all of the above
The Code ___.
all of the above
A qualified person is one who has ___ of the hazards involved and what precautions must be taken to prevent any personal harm or equipment damage.
all of these
NEC® Article 110.16 requires that switchboards, panelboards, and industrial motor control panels in other than dwelling occupancies that are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of ___.
arc flash hazards
Per the NEC®, receptacles that are installed outdoors at a fast food establishment ___ required to be GFCI protected. These are accessible to the public.
are
Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that is available ___.
at the line terminals of the equipment
In dwelling units, GFCI protection is required in ___.
bathrooms
Listing and labeling information included with panelboards and switchboards contains information regarding the correct ___ of the equipment.I. inspection II. mounting
both I & II
Overcurrent protective devices shall be so selected and coordinated as to permit the circuit protective devices used to clear a fault without the occurrence of extensive damage to the electrical components of the circuit. This fault shall be assumed to be ___.I. between any circuit conductor and the equipment grounding conductor(s) or enclosing metal racewayII. between two or more of the circuit conductors
both I and II
Nominal voltage includes a range of actual circuit voltages that are ___ the nominal voltage.
both a & b
The purpose of the NEC® is the practical safeguarding of ___ from hazards arising from the use of electricity.
both a & b
Refer to Figure 210.18. The grounded conductor between the two panels carries current during ___.
either a or b
Informational Notes ( I-Notes ) in the National Electrical Code® are ___.
explanatory information (not mandatory)
Which of the following installations ARE covered by the NEC®?
none of the above
The neutral conductor of a 120-volt circuit is referred to as the ___ conductor in the NEC®.
grounded
When a piece of equipment is connected to the earth, it meets the definition for ___.
grounded
Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger is the definition of ___.
guarded
A(n) ___ is an assembly of one or more enclosed sections having a common power bus and principally containing motor control units.
motor control center
Harmonic currents occur when ___ loads are connected to the circuit.
nonlinear
You are to install a 20-amp multiwire branch circuit that is fed from the breaker(s) in spaces 2 & 4 in the panelboard shown in Figure 128.182. The circuits supply receptacles in the living room in a house. The breakers can be ___.
one 2-pole AFCI breaker
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
When overcurrent devices are selectively coordinated and a fault occurs somewhere on a branch circuit, what should happen?
the branch circuit OCPD that is nearest the fault should open
Conductors supplying more than one receptacle for cord-and-plug connected portable loads shall have an ampacity of not less than ___.
the branch circuit rating
The definition of a branch circuit is ___.
the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)
Listed or labeled equipment shall be installed and used in accordance with ___.
the instructions included in the listing or labeling
The ampacity of an insulated conductor is ___.
the maximum amount of current it can carry continuously without damage to the insulation
Section 110.14(C) states: "Conductors with temperature ratings higher than specified for terminations shall be permitted to be used for ampacity adjustment, correction, or both." This means that when an ampacity correction for a THHN/THWN conductor is required due to temperature, the corrected ampacity is calculated by multiplying the ampacity listed in the 90°C column (typically from Table 310.16) times the correction factor. This is a ___ statement because a THHN/THWN conductor has a maximum temperature rating of ___.
true 90°C
The "hot" conductor of a circuit is referred to as the ___ conductor in the NEC®.
ungrounded
The disconnecting means for a multiwire branch circuit shall open all ___ at the point of origin.
ungrounded
