Electrical wiring final
The front edge of a box installed in a combustible wall must be within _______ of the finished surface.
1/4 inch
NEC 210.52(H) states that hallways of _________ or more in length, shall have at least one receptacle outlet. This is measured _______________.
10 feet, along the centerline
In NM cable we have to strap within _________ inches of a box.
12
The open-circuit voltage between the two terminals of a single-pole switch on a lighting circuit when the switch is in the OFF position is
120V
NEC 240.4(D) is referred to as the "Small Conductor Rule" and tells us that the maximum overcurrent protection is 15 amperes for ____ copper conductors.
14AWG
14 AWG wire is rated for how many amps?
15 Amps
List wire sizes in AWG and their amperages for 14AWG, 12AWG, and 10AWG
15amp - 14AWG 20amp - 12AWG 30amp - 10AWG
List the colors of Romex and their amperage ratings.
15amp - White 20amp - Yellow 30amp - Orange 40 or 50amp - Black
The maximum volt-ampere loading permitted on a 20-ampere branch circuit with a continuous load is ____ watts (volt-amperes).
1920
How many small appliance circuits are required in a residential kitchen?
2
When wiring 3-way switches, you always need at least ________ 3-way switches?
2
12 AWG wire is rated for how many amps?
20 Amps
What is the incoming power voltage, from phase to phase, at a residential service?
208V or 240 nominal
The NEC permits all bathroom receptacles to be on a single ____ branch circuit so long as it doesn't supply other loads.
20A
The National Electrical Code is revised every ____ years so as to be as up to date as possible.
3
The minimum lighting load requirement for dwellings is ____ volt-amperes per square foot.
3
Ceiling-suspended paddle fans must not be located within a zone measured ____ horizontally and ____ vertically from the top of the bathtub rim or top of a shower stall threshold.
3 feet, 8 feet
An arc flash can produce temperatures of ____°F.
35,000
Calculate the minimum number of 15-ampere, 120v lighting branch circuits required in a residence of 1,850 square feet. How many lighting circuits would this house need?
4
Class A GFCI devices may or may not trip (open) when a ground-fault in the range of ____ milliamperes occurs.
4 to 6
What is the range where GFI's need to trip to protect human life?
4-6 mA
Some inspectors consider the area within a ____ angle from a roof line or overhang to be a damp location.
45 degree
Most public service commission's require that the voltage for residential services be held to ± ____ percent of the nominal voltage as measured at the service point.
5%
A doorjamb switch is usually mounted about ____ above the floor, on the inside of the 2 x 4 framing on the hinge side of the closet door.
6 feet
Wall receptacles must be placed so that no point measured horizontally along the floor line in any wall space is more than ____ feet from a receptacle outlet.
6 feet
By Code, we need how many inches of conductor coming out of our box?
6 inches
When an existing two-wire, non-grounding-type receptacle is replaced in a location where the Code requires a GFCI receptacle, it is permitted to be replaced by
A GFCI type receptacle
For safety, it is very important that electrical equipment be "listed" by the
A National Recognized Testing Laboratory (NRTL)
Which of the following is NOT included when calculating the usable area of a dwelling to compute the required lighting load?
A crawl space (options: living room, crawl space, an unfinished basement, and powder rooms.
A bathroom is defined as "an area including a basin, with one or more of the following:
A toilet, tub, or a bidet.
NEC 406.4(D)(4) requires ____ protection where replacements are made at receptacle outlets that are required to be so protected elsewhere in the Code.
AFCI
What are the colors in NMB 14-3 wire not counting the bare ground?
Black, White, and Red
What is the color coding for 120/208 vac?
Black/red/blue/white
When wiring an outlet, we commonly say Black to
Brass
What color is 480Vac wiring?
Brown, orange, yellow & gray (green ground)
A partially protected area, such as an open porch, or under a roof or canopy, is a(n) ____________________ location.
Damp
Which switch type is rarely used in residential wiring?
Double pole
GFCI and AFCI protection is only provided by breakers?
False
GFCI receptacles are the only way to protect circuits in bathrooms.
False
Receptacle outlets must be installed so that no point along the floor line in any wall space is more than twelve feet from a receptacle.
False
An outside weatherproof outlet is required to have ____________________ protection.
GFCI
Receptacles in unfinished basements must be ____________________ protected.
GFCI
The National Electrical Code requires outdoor receptacles to be
GFCI protected
What color can a neutral be?
Gray
When using nonmetallic boxes, the equipment grounding conductor in nonmetallic-sheathed cable is connected to the ____-shaped equipment grounding screw found on all switches and receptacles.
Green hexagon
Receptacles installed on 15- and 20-ampere branch circuits must be of the ____ type
Grounding.
What is the name of the wire that goes from our switch up to the light?
Hot/feed
How is track lighting load in residences calculated?
It is considered to be part of the general lighting load of 3 volt-amperes per square foot.
Does the NEC stand for the Minimum or Maximum standards?
Minimum
What Code section provides very specific rules for the location and types of luminaires permitted to be installed in clothes closets?
NEC 410.16
Is a receptacle required in a residential hallway that is 8ft. long?
No receptacles are only required every 10 feet in a hallway.
What federal organization dictates requirements for work-related safety issues?
Occupational Safety and Health Administration
What is the color jacket on 10 AWG NM-B?
Orange
We connect switches in _________ with the lighting load?
Parallel
What determines the rating of a branch circuit?
Rating of the overcurrent device
Nationally Recognized Testing Laboratories (NRTL) test and evaluate products for
Safety and approval
The general lighting load for a dwelling is based on the
Square footage of the dwelling
What kind of receptacle outlet has a top portion that is "hot" at all times and a bottom portion that is controlled by the wall switch?
Switched outlet
What type of lighting is wall washing?
Task lighting
Every time an electrician makes a decision concerning the electrical wiring, the decision should be checked by reference to the
The NEC
When measuring the length of a hallway with a corner, you measure along what path?
The center line
What is the name of the black screw on a 3-way switch?
The common
The authority having jurisdiction over electrical construction is generally the
The electrical inspector
In the international system of units, the prefix kilo- means
Thousand
What is the name for the wires that go between 3-way and 4-way switches?
Travelers
A damp location is a partially protected area such as an open porch, or under a roof eve or canopy?
True
Device boxes (1-gang) typically have 6-32 screws
True
Hallways 10' or longer are required to have an outlet.
True
The NEC defines a kitchen as an area with a sink and permanent provisions for food preparation and cooking.
True
What do the letters UL signify?
Underwriters Laboratory
The NEC allows what maximum number of receptacle outlets to be connected on a 120-volt residential lighting or small-appliance branch circuit?
Unlimited
A location exposed to the weather is a ____ location.
Wet
What is the color of the jacket on 14 AWG Romex?
White
14-3 NM-B cable has what kind/color of wire in it?
White, black, and red.
When using nonmetallic boxes, the volume allowance is based on
Wiring devices, cable clamps, and equipment grounding conductors.
For NM cable, we need to strap/support it how often?
Within 12 inches of a box and every 4.5 feet
Is a receptacle required in a bedroom on a 3ft. wall space behind the door? The door is normally left open.
Yes. No wall more than 2 feet wide and 6 feet from a receptacle must have a receptacle.
GFCI protection is required for which of the following?
a receptacle installed within 6 feet of a wet-bar sink Options: outdoor receptacles installed at eaves for snow melting equipment, a kitchen receptacle installed inside a cabinet to supply a microwave oven, a receptacle installed within 6 feet of a wet-bar sink, or a receptacle installed for a kitchen clock
The term approved means to be
acceptable to the authority having jurisdiction
When using nonmetallic-sheathed cable or armored cable, never use the bare equipment grounding conductor as a(n) ____________________ conductor, and never use the grounded circuit conductor as an equipment grounding conductor.
anything other than a ground.
According to NEC 406.9, receptacles ____ permitted to be installed in bathtub and shower spaces.
are not
As defined in Article 100, a bathroom is required to have a ____.
basin
All measurements in the National Electrical Code are shown in which system(s) of units?
both inch-pound and metric values
NEC 410.10(D) ____ lighting track to be located within a zone measured 3 ft (900 mm) horizontally and 8 ft (2.5 m) vertically from the top of a bathtub rim or top of a shower stall threshold.
does not permit
With ____ products, it takes two failures to create a shock hazard to the user
double insulated
Which rule of thumb can be followed when planning branch circuits for dwelling units?
load circuits to no more than 80% of their rating
Lighting fixtures intended for installation in wet locations must be
marked "Suitable for Wet Locations"
Recessed or surface-mounted luminaires and recessed exhaust fans ____ be located within the restricted zone near the bathtub.
may
Many electricians wire the lights and receptacles in a room on different circuits because
offers the advantage that all power in a room will not go out if the overcurrent protective device trips
In the international system of units, the prefix milli- means
one thousandth
As defined in Article 100, a dwelling unit has the following feature(s)
permanent provisions for living, sleeping, cooking, and sanitation
GFCI protection is not required for
receptacle installed behind a range or refrigerator
Always ____________________ the power before working on an electrical circuit.
shut off and lock out/tag out
Where there are six or more ______________ on an interior stairway, a wall-switch control of the stairway lighting must be provided on each floor level and any level that has an entryway.
stair risers
Nationally Recognized Testing Laboratories (NRTL) ____ electrical products to provide a basis for approval by inspectors in the field.
test and list
How many lighting outlets are permitted on one branch circuit?
unlimited
Install luminaires listed for ____ locations if they will be subject to shower spray.
wet
When drilling through a stud or 2x4, what is the distance we need to maintain from the outside edge of the 2x4?
1 1/4 inches
Residential wiring plans generally show lighting and receptacle outlet locations but not circuits. The electrician should design the installation with which of the following in mind?
Economy-minimizing the number and length of circuits, convenience for the homeowner or other user, and National Electrical Code requirements
In construction of one- and two-family dwellings, the electrical circuits are usually designed by the
Electrician
Who designs the lighting and power layout for a typical house?
Electrician
Task lighting provides focus and attention to an object or area in the home.
False
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose True (switch required) or False (switch not required) for the following area: Attic (not intended for storage)
False
Each device yoke in a box count as 4 of the largest wires contained in that box for fill calculations.
False (2)
Electrical outlets are anywhere a person could tap into the power. These could be lighting outlets and/or receptacle outlets.
True
If a wall is more 24" long, it is required to have an outlet, even if it behind a door.
True
Nominal voltage means "in name only, not a fact". We would say "120 volts" even if we read an actual voltage of 110, 115, 117, or even 123 volts.
True
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose True (switch required) or False (switch not required) for the following area: Bathroom
True
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose True (switch required) or False (switch not required) for the following area: Crawl space (contains equipment that requires servicing)
True
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose True (switch required) or False (switch not required) for the following area: Hallway
True
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose True (switch required) or False (switch not required) for the following area: Stairway
True
The use of the word shall indicates a(n) ____________________ rule.
mandatory
UL requires that the instructions furnished with GFCIs be marked and that testing be performed upon installation and at least ____________________ each month as well as after severe lightning storms.
once
As defined in NEC Article 100, a(n) ____ is a point on the wiring system at which current is taken to supply utilization equipment.
outlet
A light above a workbench is an example of
task lighting
Some portable appliances use double insulation in place of grounding to provide shock protection to users. Double-insulated appliances normally have ____ power cords and attachment plug caps.
two wire