Residential Exam
When installing NM cable through bored holes in wooden studs, the holes shall be bored so that the edge of the hole is NOT less than _____ from the edge, or the cable shall be protected by a steel plate at least 1/16 inch thick.
1 1/4 inches
What is the MINIMUM size copper SE cable with Type THHW insulation that may be used as ungrounded (phase) service-entrance conductors for a 150-ampere rated, 120/240-volt, single-phase residential service?
1 AWG
When using wood braces to support metal device boxes to structures, the braces shall have a cross-section of NOT less than _____.
1 inch x 2 inches
In dwelling units, hallways of _____ feet or more in length are required to have at least one (1), 15- or 20-ampere rated 125-volt receptacle outlet.
10
The MINIMUM size copper equipment grounding conductor required for equipment served by a 40-ampere rated branch circuit is _____.
10 AWG
Disregarding exceptions, when installing electrical metallic tubing (EMT), the run of tubing is required to be securely fastened at LEAST every _____.
10 feet
Where it is impractical to locate the service head or gooseneck above the point of attachment of the service drop conductors, the service head or gooseneck shall be permitted NOT further than _____ from the point of attachment.
2 feet
For the purpose of determining box fill, size 12 AWG copper conductors with THHN insulation are to be calculated at _____ per conductor in the box.
2.25 cubic inches
When wall switches are installed in the same room with a spa or hot tub, the MINIMUM distance from the switches to the inside wall of the hot tub or spa shall be _____.
5 feet
When doing residential service and feeder calculations, electric clothes dryers are to be calculated at a MINIMUM of _____ watts (VA) or the nameplate rating, whichever is larger.
5,000
Disregarding exceptions, the power supply cord to a mobile home shall have a MAXIMUM rating of _____ amperes.
50
When exceptions are not applicable, the MINIMUM size underground service lateral conductors permitted by the NEC® is _____
8 AWG copper
For 120-volt, 15- and 20-ampere residential branch circuits, the rating of any one cord-and-plug-connected utilization equipment not fastened in place shall NOT exceed _____ of the branch-circuit ampere rating.
80%
Where one-family dwellings with a demand load of not more than 400 amperes are supplied by a single-phase, 120/240-volt electrical system, for sizing the ungrounded (line) service-entrance conductors, an ampacity reduction of NOT less than ___________ of the ampacity values of NEC® Table 310.12 may be used.
83%
What is the MAXIMUM time period allowed for temporary outdoor Christmas decoration lighting for residences?
90 days
All 125-volt, single-phase, 15- and 20-ampere rated receptacles installed in residential garages shall be _____. I. protected by a listed arc-fault interrupter II. provided with ground-fault circuit-interrupter protection
II only
Electrical outlet boxes installed in walls and ceilings are required to be __________.
accessible
All 125-volt, single-phase, 15- and 20-ampere receptacles installed in the laundry room of a dwelling unit must be provided with GFCI protection where located _____.
anywhere in laundry room
Disregarding exceptions, where residential lighting outlets are installed in interior stairways, there shall be a wall switch provided ______.
at the top and bottom of the stairs if there are more than six (6) risers
For dwelling units, panelboards are permitted to be located in all of the following areas listed EXCEPT ____________.
bathrooms
As a general rule, all residential receptacles installed on 15- and 20-ampere, 120-volt branch circuits are required to _____.
be of the grounding type
Concealed knob and tube wiring shall be permitted to be used ONLY for _____.
extensions of existing installations
Receptacle outlets, unless listed as receptacle assemblies for countertop or work surface applications, installed in the _____ position in countertops or work surfaces are prohibited.
face-up
The front edge of a switch box installed in a wall constructed of wood shall be _____ from the surface of the wall.
flush with or projected out
In general, all 125-volt, single-phase, 15- and 20-ampere rated receptacle outlets installed in the following listed locations of dwelling units EXCEPT____, shall be protected by a listed ground-fault circuit interrupter.
hallways
A connection to a driven or buried grounding electrode shall ______.
not be required to be accessible
In general, service conductors installed as open conductors shall have a clearance of NOT less than _____ feet from windows that are designed to be opened, doors, porches or balconies.
three
In a dwelling unit bedroom, any wall space that is at LEAST _____ feet or more in width must be provided with a general use receptacle outlet.
two
Which of the following conductors are required to have overload protection on a residential electric service?
ungrounded conductors
The NEC® requires recessed portions of luminaire enclosures that are not identified for contact with insulation to be spaced from combustible material a MINIMUM of _____.
1/2 inch
In walls or ceilings with a surface of concrete, tile, gypsum, plaster, or other noncombustible material, boxes employing a flush-type cover or faceplate shall be installed so that the front edge of the box will NOT set back of the finished surface more than _____.
1/4 inch
Metallic surface type cabinets for electrical equipment located in damp or wet locations shall be mounted so there is at LEAST _____ air space between the cabinet and the wall or other supporting surface.
1/4 inch
A metal underground water pipe may serve as a grounding electrode where it is in direct contact with the earth for at LEAST _____ feet or more.
10
The point of attachment of the overhead service conductors to a residence is required to be at LEAST _____ above grade, where the voltage is 120/240, single-phase.
10 ft
Service equipment for an individual mobile home shall be rated NOT less than _____ amperes at 120/240 volts, single-phase.
100
Where a dwelling unit has a demand load of 8 kVA and a total of six (6) branch circuits, the service disconnecting means shall have a rating of NOT less than _____.
100 amperes
When installing luminaires without GFCI protection provided above an indoor located spa or hot tub, they are required to be mounted at LEAST _____ above the maximum water level of the spa or hot tub.
12 feet
Given: You are to install a 20 ampere, 120 volt, GFCI-protected, buried, branch circuit that supplies landscape lighting for a residence. If UF cable is used for this installation, it is required to have a ground cover of at LEAST __________.
12 inches
What is the MAXIMUM allowable voltage between conductors connected to a branch circuit supplying luminaires in a residence?
120 volts
The ampacity of branch-circuit conductors and the rating or setting of overcurrent protective devices supplying fixed outdoor electric deicing equipment shall NOT be less than _____ percent of the full load current of the equipment.
125
The ampacity of the branch-circuit conductors supplying a residential central heating electric furnace shall NOT be less than _____ of the furnace load.
125%
The MINIMUM internal depth of a box that is intended to enclose a flush mounted device supplied by 14 AWG conductors shall be _____.
15/16 inch
Any one cord-and-plug-connected portable appliance connected to a 120-volt, 20-ampere rated branch circuit shall have a MAXIMUM rating of _____ amperes.
16
Receptacle outlets installed in floors of dwelling units shall not be counted as part of the required number of receptacle outlets if they are MORE than _____ inches from the wall.
18
When an intermediate metal conduit (IMC) contains conductors of 1,000 volts or less and is buried under a gravel driveway of a one-family dwelling, the IMC must be buried at LEAST _____.
18 inches
How many size 12/2 AWG with ground Type NM cables are permitted to be installed in an outlet box with a total volume of 18 cubic inches when the box contains a duplex receptacle outlet?
2
When two (2) single-pole switches are mounted on the same strap, the number of conductors permitted in the box shall be reduced by _____ conductor(s).
2
Where a mobile home has the main service disconnecting means installed outdoors, the disconnecting means shall be installed so the bottom of the enclosure is NOT less than _____ above finished grade.
2 feet
All 15 and 20 ampere, single-phase, 125 volt receptacle outlets located at LEAST __________ from the inside walls of a permanently installed swimming pool shall be provided with GFCI protection.
20 feet
The MAXIMUM height that household kitchen countertop and work surface 125-volt, 15- or 20-ampere receptacle outlets may be installed above the countertop or work surface, and be counted as one of the required receptacle outlets, shall be _____.
20 inches
Receptacles in a kitchen of a residence that are to serve countertop and work surfaces shall be installed so that no point along the wall line is more than _____ inches, measured horizontally, from a receptacle outlet in that space.
24
The rating of any single cord-and-plug connected appliance supplied by a 30-ampere rated branch circuit shall NOT exceed _____ amperes.
24
For residential lighting systems operating at 30 volts or less, the output circuits of the power supply are to be rated for NOT more than _____ under all load conditions.
25 amperes
A branch circuit supplying more than one electric baseboard heater in a residential occupancy shall be rated a MAXIMUM of _____ amperes.
30
Where a 40-gallon storage-type electric water heater has a nameplate rating of 4,500 watts @ 240 volts, what is the MAXIMUM standard size circuit breaker the NEC® permits to protect the water heater?
30 amperes
In dwelling units, at least one (1) 125-volt, single-phase, 15- or 20-ampere rated receptacle shall be installed in bathrooms; the receptacle shall be within at LEAST _____ of the outside edge of each basin.
36 inches
The MINIMUM number of 120-volt, 15-ampere, general lighting branch circuits required for a dwelling that has 70 feet by 30 feet of habitable space is _____.
4
In compliance with the NEC®, what is the MAXIMUM distance allowed between supports when installing Type NM cable?
4 1/2 feet
Given: The ungrounded service-entrance conductors for a one-family residence are size 3/0 AWG THWN copper conductors. A copper grounding electrode conductor attached to the concrete-encased steel reinforcing bars used as the grounding electrode shall NOT be smaller than size _____.
4 AWG
When calculating the demand load for a one-family dwelling, what total MINIMUM volt-amperes (VA) must be included in the calculation for the required small-appliance and laundry circuit loads?
4,500
Electric water heaters for swimming pools shall have the heating elements subdivided into loads NOT exceeding _____ amperes
48
Determine the MINIMUM number of 15-ampere, 120-volt general lighting branch circuits required for a dwelling that has 2,600 square feet of habitable space.
5
The MAXIMUM number of size 10 AWG conductors permitted in a 4 inch x 1¼ inch octagon metal junction box is _____.
5
Disregarding exceptions, in each attached garage of one-family, two-family, and multifamily dwellings, at least one 125-volt, 15- or 20-ampere receptacle outlet is required to be installed in each vehicle bay and not more than _____ above the floor.
5 1/2 feet
Where a 120-volt lighting branch-circuit is to supply only six (6) 100 watt, 120-volt, incandescent luminaires, determine the approximate total current on this branch circuit.
5 Amperes
A luminaire shall be supported independently of the outlet box when it weighs more than _____ pounds, unless the outlet box is listed and marked on the interior of the box for the maximum weight to be supported.
50
What is the MAXIMUM allowable cord length for the cord supplying a cord-and-plug connected built-in dishwasher installed under a kitchen counter in a dwelling unit?
6 1/2 feet
A GFCI-protected receptacle outlet that provides power to a permanently installed swimming pool recirculating water pump motor shall be permitted NOT closer than ________ feet from the inside wall of the pool.
6 feet
supported by braces or guy wires
6 lbs
When applying the general method of calculations for a dwelling unit, what is the feeder and service demand load, in kW, for one (1) 8 kW rated residential electric range?
6.4 kW
The NEC® mandates the ampacity of UF cable shall be that of _____ conductors.
60ºC rated
A 150 kVA, single-phase transformer having a secondary voltage of 120/240 is to be installed at a multi-family dwelling. The approximate current available at the transformer secondary is _____ amperes.
625
A branch circuit supplying a 5 kW wall-mounted oven and a 7 kW counter-mounted cooktop in a residence will have a demand load of _____ on the ungrounded service-entrance conductors when applying the general (standard) method of calculations for dwellings.
7.8 kW
Ceiling-suspended (paddle) fans are required to be supported independently of an outlet box when the paddle fan weighs MORE than _____.
70 lbs
A 240 volt, single-phase, 30 ampere rated electric clothes dryer has a volt-ampere rating of ____________ VA.
7200
When applying the general method of calculation, it shall be permissible to apply a demand factor of _____ to the nameplate rating load of four (4) or more fastened in place electric water heaters that are served by the same feeder or service in a multi-family dwelling unit.
75%
Unless rock bottom is encountered, a driven ground rod is required to be driven a MINIMUM depth of _____ feet into the soil.
8
Where a single-phase, 240-volt air-conditioning unit has a full-load current rating of 35 amperes, what is the MINIMUM size 75ºC rated copper conductors required to supply the air-conditioning unit?
8 AWG
Where nonmetallic sheathed cable (NM) is run at angles with joists in unfinished basements, the smallest three (3) conductor cable permitted to be installed directly to the lower edges of the joists is size _____.
8 AWG
All single-phase, 15 or 20-ampere branch-circuits supplying outlets or devices installed in residential kitchens or similar rooms, shall be protected by a listed arc-fault circuit interrupter of the _____ type.
Combination
A conductor that is connected to establish electrical continuity and conductivity between metal parts required to be electrically connected is defined as a ___________ conductor in the NEC®.
bonded
The purpose of an intersystem bonding termination is to provide a means for connecting _________ to the grounding electrode system.
bonding conductors for communication systems
In dwelling units, all 125-volt, single-phase, 15- or 20-ampere rated receptacle outlets installed within six (6) feet of the outside edge of a sink in a laundry room shall be provided with _______.
both GFCI protection and AFCI protection
Type XHHW insulated conductors are permitted to be used in _____.
dry damp or wet locations
Receptacle outlets on a 20-ampere rated small appliance branch circuit serving kitchen countertops in a dwelling unit are to be rated _____. I. 15 amperes II. 20 amperes
either I or II
All single-phase cord-and-plug connected room air-conditioners located in the bedroom of a dwelling unit shall be provided with _________.
either factor-installed AFCI, HDCI, or LCDI protection
In regard to dwelling units, the branch-circuit supplying 125-volt, single-phase, 15- or 20-ampere rated receptacle outlets in a garage _____.
is permitted to supply readily accessible outdoor receptacles
The service equipment for a mobile home may be _____ the mobile home it serves.
mounted on a pole, not more than 30 feet from
When calculating the service demand load on a dwelling unit, how many VA per square feet must be included for the general use receptacle outlets?
none
Switches and circuit breakers used as a disconnecting means to appliances shall be _____.
of the indicating type
When doing box fill calculations, a luminaire stud or hickey in a ceiling mounted outlet box is an equivalent to _____ conductor(s), based on the largest conductor in the box.
one
Three-way and four-way switches shall be so wired that all switching is done_____.
only in the ungrounded circuit conductor
Unless listed for the control of other loads, general use dimmer switches shall only be used to control _____.
permanently installed incandescent luminaires
When the heating, air-conditioning, or refrigeration equipment is installed on the roof of an apartment complex, a 125-volt, 15- or 20-ampere rated receptacle outlet _____.
shall be located on the same level and within 25 feet of the heating, air-conditioning, or refrigeration equipment
Of the following listed connectors, which type is PROHIBITED for connection of a grounding conductor to enclosures?
sheet metal screws
A receptacle outlet installed for a gas or electric clothes dryer in the laundry room of a dwelling unit must be installed within at LEAST _____ feet of the intended location of the dryer.
six
The service disconnecting means for each individual residential service shall consist of NOT more than _____ fused disconnect switches or circuit breaker enclosures.
six
When installing an overhead service using a rigid metal conduit (RMC) mast for the support of the service-drop conductors, the mast shall be of adequate strength or be _____ to safely withstand the strain imposed by the service drop.
supported by braces or guy wires
Underwater luminaires installed in swimming pools are required to have GFCI protection if they operate at a voltage GREATER than _____.
the low voltage contact limit
Raceways installed in solid rock shall be permitted to be buried at lesser depths than generally required, when covered by at LEAST _____ inches of concrete, extending down to the rock.
two
