Myles branch circuits study guide
In kitchens, a receptacle outlet must be installed at each counter space that is __________ or wider.
12" wide
Service entrance cables must be supported by straps or staples within __________ inches of any electrical enclosure and at intervals not exceeding __________ inches.
12, 30
Conduit fill for #12 THWN in 3/4 Electrical Metallic Tubing?
16
Underground service conductors are required to be buried at least __________ feet by the NEC.
2
According to NEC Table 250.66, the minimum size copper grounding electrode conductor for a service entrance installed with 4/0 copper conductors is __________.
2 AWG
Individual wall spaces of __________ or more in width are considered usable for the location of a lamp or appliance, and a receptacle outlet is required.
2 feet
A service mast is made of rigid metal conduit or intermediate metal conduit and should be at least a __________ trade size conduit to provide adequate strength.
2 inches
If a set of blueprints has a scale of 1/8" = 1', a wall that is actually 17' long will be __________ long on the blueprint.
2-1/8"
When a ground ring is used as a grounding electrode, it must be at least a 2 AWG copper conductor at least __________ feet long.
20
When doing a service entrance calculation and applying the demand factor to the total load of the general lighting load, the small appliance circuits, and the laundry circuit, the first __________ volt-amps are computed at 100%
3,000
When doing a service entrance calculation, if a residence has four fixed appliances, a demand factor of __________% is applied to the total load of these appliances.
75
Direct buried conductors emerging from the ground must be protected to a point at least __________ feet above finished grade.
8
When installing Romex into a single-gang nonmetallic device box, the cable must be secured no more than __________ from the box.
8"
If a blueprint is drawn with a scale of 1/8" = 1', a line 1 inch long will equal __________ on the blueprint.
8'
Which of the following are names for the building plans used by craftspeople to build houses?
Blueprints, Construction drawing, Working drawings
A(n) __________ shows the side of the house that is facing a certain direction.
Elevation drawings
__________ is a general term used for material, fittings, devices, appliances, lighting fixtures, apparatus, machinery, and other parts used in connection with an electrical installation.
Equipment
When considering lighting outlets in dwelling units, a vehicle door in a garage is considered and outdoor entrance.
False
Where a lighting outlet(s) is installed for interior stairways, there must be a wall switch at each floor landing that includes an entry way where the stairway between floor levels has four risers or more.
False
Which of the following colors is not acceptable for an ungrounded conductor?
Gray
All 15 and 20A, 125V single-phase receptacles _____ of commercial occupancies must have GFCI protection for personnel.
In bathroom in kitchen and on rooftops
An individual 20A circuit is permitted to supply power to a single dwelling unit bathroom for receptacle outlet(s) and other equipment within the same bathroom.
True
GFCI protection for personnel is required for all 15 and 20A, 125V single-phase receptacles installed to serve the countertop surfaces in dwelling unit kitchens.
True
Guest rooms in hotels, motels, and similar occupancies without permanent provisions for cooking must have receptacle outlets installed in accordance with 210.52(A) and 210.52(D).
True
Where a branch circuit supplies continuous loads, or any combination of continuous and noncontinuous loads, the rating of the overcurrent device must not be less than the noncontinuous load plus 125 percent of the continuous load.
True
All 15 and 20A, 120V branch circuits that supply outlets in dwelling unit bedrooms must be AFCI protected by a listed arc-fault circuit interrupter of the combination type after January 1, 2008.
True
The __________ is a drawing that shows building detail from a view directly above the house.
floor plan
GFCI protection for personnel is required for all 15 and 20A, 125V single-phase receptacles installed in a dwelling unit _____.
garage
The __________ is the conductor used to connect the grounding electrode to a system conductor or equipment.
grounding electrode conductor
A(n) __________ is a plastic or fiber fitting designed to screw onto the ends of a conduit or cable connector to provide protection to the conductors.
insulated bushing
In locations other than dwelling units, a kitchen _____.
is required to have GFCI protection on all 15 and 20A, 125V single-phase receptacles, includes a sink, includes permanent facilities for food preparation and cooking
GFCI protection is required for all 15 and 20A, 125V single-phase receptacles located within an arc measurement of 6 ft from the dwelling unit _____.
laundry sink utility sink wet bar sink
When more than one nominal voltage system exists in a building, each ungrounded system conductor must be identified by system. The means of identification must be permanently posted at each branch-circuit panelboard.
true
What Size wire should I use on a 5500 watt water heater with 240 volts ?
#10
When holes are bored through wood framing members for the purpose of installing an electrical cable, the holes must be bored so the edge of the hole is not less than __________ from the nearest edge of the wood framing member.
1-1/4"
A 4" x 1 1/2" square box can hold a maximum of __________ 14 AWG conductors.
10
The NEC requires a clearance of at least __________ feet above final grade for service conductors where they are connected to the building, above sidewalks and other areas accessible to pedestrians.
10
EMT must be supported at least every __________ along the run. (General Rule)
10'
When computing box fill, 3 - 12 AWG conductors and 2 - 14 AWG conductors would total __________ cubic inches.
10.75
A single receptacle installed on an individual branch circuit must be rated at least _____ percent of the rating of the branch circuit.
100
According to Table 310.16 in the NEC, the ampacity for a 3 AWG copper conductor using the 75 degree Celsius column is __________.
100 amps
Romex must be secured at no more than __________ inches from all electrical boxes except a nonmetallic single-gang box.
12
A receptacle outlet must be installed in dwelling units for every kitchen and dining area countertop space _____, and no point along the wall line can be more than 2 ft, measured horizontally, from a receptacle outlet in that space.
12 inches or wider
Romex installed in either a metal or plastic two-gang device box with interior cable clamps, must be secured no more than __________ from the device box.
12"
When computing box fill for a box that has more than one size of conductor in it, a 12 AWG conductor counts as __________ cubic inches.
2.25
According to NEC Table 310.15(B)(6), the minimum conductor size for a 200 ampere residential service entrance is __________ CU or __________ AL.
2/0 AWG; 4/0 AWG
Kitchen and dining room countertop receptacle outlets in dwelling units must be installed above the countertop surface, and not more than _____ above the countertop.
20 in.
The required receptacle for a dwelling unit countertop surface can be mounted a maximum height of _____ above a dwelling unit kitchen counter surface.
20 inches
Receptacle outlets must be installed above, but not more than __________ the kitchen countertop.
20"
There must be a minimum of one _____ branch circuit for the laundry outlet(s) in the dwelling unit.
20A
Two or more _____, 120V small-appliance branch circuits must be provided to supply power for the receptacle outlets in the dwelling unit kitchen, dining room, breakfast room, pantry, or similar dining areas.
20A
A receptacles outlet must be installed at each wall counter space that is 12 in. or wider so that no point along the wall line is more than _____, measured horizontally, from a receptacle outlet in that space.
24 in
At least one receptacle outlet must be installed at each peninsular counter space with a long dimension of __________ or greater and a short dimension of __________ or greater.
24", 12"
According to Table 310.16 in the NEC, the ampacity for a 12 AWG copper conductor using the 60 degree Celsius column is __________.
25 amps
A 15 or 20A, 125V, single-phase receptacle outlet must be installed at an accessible location for the servicing of heating, air-conditioning, and refrigeration equipment. The receptacle must be located on the same level and within _____ of the heating, air-conditioning, and refrigeration equipment.
25 ft
Where only two conductors are installed in a raceway, the conduit cannot be filled to more than __________ of the conduit's cross-sectional area.
31%
Ceiling suspended paddle fans that weigh more than __________ pounds may be supported by an outlet box as long as the box has the maximum weight it can support marked on it.
35
In locations other than dwelling units, a kitchen _____.
36"
Rigid Metal Conduit must be supported within __________ of outlet boxes, junction boxes, cabinets, and conduit bodies. (General Rule)
36"
In dwelling units, at least one wall receptacle outlet must be installed in bathrooms within _____ of the outside edge of each basin. The receptacle outlet must be located on a wall or partition that is adjacent to the basin or basin countertop.
36in
A house with 2,000 square feet of habitable living space will require at least __________ general lighting circuits if 15-ampere circuit breakers are used to provide circuit protection
4
Conduit fill for # 2 wire THWN in 1 1/4" Rigid PVC Conduit
4
Receptacles must be placed behind a kitchen countertop so that no more than __________ feet is between each receptacle.
4
The maximum distance between supports for a Type NM cable is __________.
4 1/2 feet
A metal 4" square box has ten 12 AWG conductors, four 12 AWG grounding conductors, and four external clamps. What is the minimum size 4" square box you could use?
4 x 2 1/8
Conduit fill for #10 THWN for 1/2 " Electrical Metallic Tubing?
5
The recommended maximum total voltage drop on both the feeder and branch-circuit conductors combined is _____ percent.
5
Receptacles that are installed to meet NEC Section 210.52 placement requirements are not permitted to be more than __________ above the floor.
5.5'
Copper coated steel ground rods must be listed and be at least __________ in diameter.
5/8"
Multioutlet circuits rated 15 or 20A can supply fixed appliances (utilization equipment fastened in place) as long as the fixed appliances do not exceed _____ percent of the circuit rating.
50
Device boxes can support a lighting fixture weighing no more than ________ lbs. as long as the fixture is secured to the box with at least two 6-32 screws.
6
At least one receptacle outlet accessible from grade level and not more than _____ above grade must be installed at each dwelling unit of a multifamily dwelling located at grade level and provided with individual exterior entrance/egress.
6 1/2 ft
Common symbols used on blueprints are usually based on the symbols developed by the __________.
American National Standards Institute
To find the maximum number of conductors of the same size and insulation type permitted in various types and sizes of conduit, you would look in __________ of the National Electrical Code.
Annex C
Where more than one nominal voltage system exists in a building, each ungrounded conductor of a branch circuit, where accessible, must be identified by system. The identification can be _____ and must be permanently posted at each branch-circuit panelboard.
Color coding, phase tape and tagging
__________ have no ears on them and are designed to be attached directly to building framing members.
New work boxes
The NEC requires a minimum clearance of __________ feet above residential property and driveways where the voltage to ground does not exceed 300 volts.
None of the above
The overhead service conductors from the last pole to the point connecting them the service entrance conductors at the building are called __________ conductors.
Service drop
In dwelling units, when determining the spacing of general-use receptacles, _____ on exterior walls are not considered wall space.
Sliding panels
The size of the grounded neutral conductor for a feeder must not be smaller than specified in _____.
Table 250.122
In which of the following NEC Tables would you find information on box fill?
Table 314.16(A)
Which of the following is not required to be marked on electrical conductors and cables?
The testing laboratory for the cable or conductor
When device boxes are installed in walls or ceilings with a combustible surface such as wood, the edge of the boxes must __________ the finished surface.
be flush with
Where device boxes are installed in walls or ceilings with a noncombustible surface, the edge of the box must __________ the wall or ceiling surface.
not be set back farther than 1/4" from
In a dwelling unit, at least _____ wall switch-controlled lighting outlet(s) must be installed in every dwelling unit habitable room and bathroom.
one
The __________ stage is when the raceways, cable, boxes, and other electrical equipment are installed.
rough-in
A(n) __________ is a cutaway view that allows you to see the inside of a building.
sectional drawing
The point of connection between the wiring of the electric utility and the house wiring is called the __________.
service point
In walls or ceilings made of noncombustible materials, electrical boxes must be mounted so they are __________ the finished wall surface.
set back no more than 1/4" from
Multiwire branch circuits must ______.
supply only line-to-neutral loads
Conduit fill for #2/0 THWN wire in 1 1/2" Rigid Metal Conduit?
3
If a 20A branch circuit supplies multiple 125V receptacles, the receptacles must have an ampere rating of no less than _____.
Underground service conductors are required to be buried at least __________ feet by the NEC.
When a warning ribbon is required to mark the location of buried underground service conductors, it must be placed at least __________ above the buried conductors.
12"
According to NEC Table 310.15(B)(6), the minimum conductor size for a 300 ampere residential service entrance is __________ CU or __________ AL.
250 kcmil; 350 kcmil
The working space in front of residential service equipment as stated in NEC Section 110.26 is __________ feet.
3
The size of the opening of a standard metal device box used to mount a switch or receptacle in a wall is __________.
3" ´ 2"
Receptacle outlets installed for a specific appliance in a dwelling unit, such as a cloths washer, dryer, range, or refrigerator, must be within _____ of the intended location of the appliance.
6 feet
Receptacles must be installed so that no point measured along the floor line in any wall space is more than __________ from a receptacle.
6 feet
Ground rods must be at least __________ feet long.
8
When installing service drop conductors above a residential roof, conductors must have a vertical clearance of at least __________. (General Rule)
8 feet
