121 Questions
Which type of circuit is permitted to be considered as multiple circuits?
Multiwire circuits
What does a multiwire branch circuit consist of?
Two ungrounded conductors and one grounded conductor
What is the purpose of a simultaneous disconnecting means for a multiwire branch circuit?
To reduce the risk of shock to personnel
In a single-phase, 120/240-volt multiwire branch circuit, what is the voltage rating of the line-to-line and line-to-neutral receptacles?
250 volts and 125 volts
According to Article 210, what is the scope of this article?
Branch circuits not over 1000 volts ac, 1500 volts dc, nominal
According to Table 210.3, which equipment is referenced in Article 210 for specific-purpose branch circuits?
Air-conditioning and refrigerating equipment
According to Article 210, what is not allowed to be reconditioned?
Equipment that provides arc-fault circuit-interrupter protection
According to the text, what is one of the acceptable alternatives to color coding for marking or tagging electrical systems?
Using labeling tape
What does the NEC specify color designations of ungrounded conductors for?
Heating cables, intrinsically safe circuits, isolated systems in health care facilities, or 4-wire delta systems
What is the exception to the requirement of identifying systems installed prior to the adoption of the 2005 NEC?
Only new installations need to be identified
What is one of the methods for identifying positive ungrounded conductors in a dc system?
A continuous red outer finish
According to the text, if two ungrounded conductors and a common neutral of a multiwire branch circuit are supplied from a 208Y/120-volt, 3-phase, 4-wire system, what is true about the neutral conductor?
The neutral carries the same current as the phase conductor with the highest current
When loads are connected line-to-line in a multiwire branch circuit, what type of circuit breakers are required to disconnect all ungrounded conductors simultaneously?
2-pole or 3-pole circuit breakers
In a premises wiring system with branch circuits supplied from more than one nominal voltage system, how should ungrounded conductors of a branch circuit be identified?
By phase or line and by nominal voltage system
According to the text, how should the grounded conductor of a branch circuit be identified?
By color coding
Which type of lampholders may be connected to 277-volt circuits?
Lampholders with a 277-volt rating
What is the maximum voltage allowed for circuits supplying auxiliary equipment of electric-discharge lamps mounted in permanently installed luminaires?
1000 volts ac
What type of ballast is required for luminaires powered from direct-current systems?
A ballast that provides isolation between the dc power source and the lamp circuit
What is the reason for permitting the use of GFCIs as replacements for receptacles where a grounding means does not exist?
GFCIs do not require an equipment grounding conductor
Which type of dc systems require a grounded conductor identified in accordance with 200.6?
Positively grounded 2-wire dc systems
What is the purpose of identifying grounded conductors of negatively grounded and positively grounded 2-wire dc systems?
To distinguish them from ungrounded conductors of 2-wire dc systems employing high-impedance references to ground
What is the maximum nominal voltage allowed for branch circuits in dwelling units and guest rooms?
120 volts
What types of luminaires can be supplied by circuits exceeding 120 volts, nominal, between conductors and not exceeding 277 volts, nominal, to ground?
LED luminaires with LED drivers
According to the text, what is the trip level of GFCIs?
5 milliamperes
According to the text, where do GFCIs not protect persons from shock hazards?
All of the above
According to the text, where are GFCIs required to be installed for personnel protection in dwelling units?
All 125-volt through 250-volt receptacles installed in the following locations
Which of the following locations does NOT require GFCI protection for receptacles?
Outdoor areas
What is the maximum voltage rating for receptacles that require GFCI protection in kitchens?
250 volts
Which of the following areas does NOT require GFCI protection for receptacles within 6 feet of a sink?
Garages
In which of the following locations are receptacles required to have GFCI protection regardless of the voltage rating?
Bathrooms
According to the NEC, which of the following is NOT required to be GFCI protected in industrial establishments where qualified personnel are involved?
Receptacles in patient bed locations of health care facilities
Which of the following appliances require GFCI protection according to the text?
Microwave ovens
What is the purpose of a buck-boost autotransformer?
To decrease the supply line voltage by a small amount
In which areas are GFCI protection required for receptacles, regardless of whether they serve countertop areas?
Kitchens
When is GFCI protection not required for lighting outlets according to the text?
When the lighting outlets are installed in crawl spaces
Which of the following receptacles would require GFCI protection according to the NEC?
Receptacles installed near sinks in lunchrooms
Which of the following is NOT a requirement for GFCI protection in garages according to the NEC?
Only garages where vehicle maintenance is expected to take place
What is the maximum voltage allowed for outdoor outlets according to the text?
120 volts
What is the requirement for GFCI protected receptacles in bathrooms?
All receptacles must have GFCI protection
What is the requirement for GFCI protected receptacles in garages?
All receptacles must have GFCI protection
What is the requirement for GFCI protected receptacles outdoors?
All receptacles must have GFCI protection
What is the requirement for GFCI protected receptacles in basements?
All receptacles must have GFCI protection
Which type of branch circuits are required to be provided for lighting and appliances, including motor-operated appliances?
Branch circuits for lighting and appliances
How should the load be proportioned among multioutlet branch circuits within the panelboard(s) when the load is calculated on the basis of volt-amperes per square meter or per square foot?
The load should be evenly proportioned among multioutlet branch circuits within the panelboard(s)
How many additional 20-ampere branch circuits are required to supply the laundry receptacle outlet(s) in a dwelling unit?
At least one additional 20-ampere branch circuit
How many 120-volt, 20-ampere branch circuits are required to supply bathroom(s) receptacle outlet(s) in a dwelling unit?
One or more 120-volt, 20-ampere branch circuits
Which branch circuit is permitted to supply receptacle outlets in attached garages and detached garages with electric power, according to the text?
20-ampere branch circuit
What is the maximum rating for the additional branch circuits that are permitted to serve receptacle outlets other than those required by 210.52(G)(1), according to the text?
20 amperes
Where should the AFCI be listed and installed, according to the text?
In a readily accessible location
Which of the following is NOT one of the four types of AFCIs recognized by UL 1699?
Portable
What is the maximum rating for AFCI devices?
20 amperes
Where should a higher level of physical protection be provided for branch-circuit conductors when the AFCI is not located at the origin of the circuit?
At the first outlet
What is the maximum length of branch-circuit wiring from the branch-circuit overcurrent device to the first outlet for a 14 AWG conductor?
15.2 m (50 ft)
Which of the following locations does NOT require AFCI protection for branch circuits according to the NEC?
Bathrooms
What is the maximum length allowed for extending an existing branch circuit without requiring AFCI protection according to the NEC?
1.8 m (6 ft)
Which of the following locations requires AFCI protection for branch circuits in dormitory units according to the NEC?
Bedrooms
What is the maximum voltage allowed for branch circuits supplying outlets in guest rooms and guest suites of hotels and motels according to the NEC?
120 volts
According to Exception No. 2, what is the maximum demand for one range with a 12-kilowatt rating?
8 kilowatts
What is the ampacity of an 8 AWG copper conductor from the 60°C column of Table 310.16?
40 amperes
According to Exception No. 2, what is the maximum ampacity for the neutral of an 8-kilowatt range circuit?
25 amperes
According to Exception No. 1, what is the minimum ampacity required for tap conductors supplying individual outlets, other than receptacle outlets, with taps not over 450 mm (18 in.) long?
20 amperes
According to the text, what is the minimum ampacity required for branch-circuit conductors supplying continuous loads or any combination of continuous and noncontinuous loads?
The noncontinuous load plus 125 percent of the continuous load
According to the text, what is the minimum branch-circuit rating required for household ranges of 83/4 kW or more rating?
40 amperes
According to the text, what is the minimum ampacity required for conductors tapped from a branch circuit not exceeding 50 amperes supplying electric ranges, wall-mounted electric ovens, and counter-mounted electric cooking units?
20 amperes
According to the text, what is the minimum ampacity required for the neutral conductor of a 3-wire branch circuit supplying a household electric range, a wall-mounted oven, or a counter-mounted cooking unit with a range of 83/4 kW or more rating?
70 percent of the branch-circuit rating
Which type of electrical system requires branch-circuit disconnecting means rated 1000 amperes or more to be provided with ground-fault protection of equipment?
Solidly grounded wye electrical systems of more than 150 volts to ground
Which of the following is not an exception to the requirement of ground-fault protection of equipment for branch-circuit disconnecting means rated 1000 amperes or more?
Disconnecting means installed on solidly grounded wye electrical systems of more than 150 volts to ground
Which of the following occupancies require guest rooms and guest suites to have branch circuits installed to meet the rules for dwelling units?
All of the above
What is the maximum ampere rating for branch circuits recognized by Article 210, for other than individual branch circuits?
10, 15, 20, 30, 40, and 50 amperes
According to the text, what is the maximum distance allowed between receptacle outlets along a wall line?
600 mm
According to Exception No. 1, which of the following appliances does not require a receptacle outlet directly behind it?
Refrigerator
According to Exception No. 2, where can a receptacle outlet be installed if it cannot be installed in the wall areas shown in Figure 210.52(C)(1)?
In the floor
What is the minimum branch-circuit rating required for household ranges of 8 3/4 kW or more rating, according to the text?
30 A
What is the maximum voltage allowed for circuits supplying auxiliary equipment of electric-discharge lamps mounted in permanently installed luminaires, according to the text?
277 V
What is the maximum voltage allowed for outdoor outlets, according to the text?
120 V
What is the maximum voltage allowed for branch circuits supplying outlets in guest rooms and guest suites of hotels and motels, according to the NEC?
240 V
Which of the following areas is NOT required to have GFCI protection for receptacles regardless of the voltage rating?
Bathrooms
How many small-appliance branch circuits are required to supply receptacle outlets in a kitchen?
Two
Which of the following is NOT a requirement for receptacle outlets on countertops and work surfaces in kitchens?
Considered as the receptacle outlets required by 210.52(A)
In which areas are GFCI protection required for receptacles, regardless of whether they serve countertop areas?
All of the above
Which of the following rooms or areas in dwelling units require receptacle outlets to be installed in accordance with the general provisions specified in 210.52(A)(1) through (A)(4)?
Bedroom
What is the maximum distance allowed between a receptacle outlet and any point along the floor line of a wall space in dwelling units?
1.8 m (6 ft)
Which of the following is NOT a requirement for receptacle outlets in dwelling units?
Receptacles shall be installed in every laundry room
According to the text, what is the maximum ampere rating allowed for a receptacle installed exclusively for the use of cord-and-plug-connected arc welders?
Not less than the minimum branch-circuit conductor ampacity determined by 630.11(A) or (B) for arc welders
What is the maximum distance allowed between a receptacle outlet and any point along the floor line of a wall space in dwelling units?
1.8 m (6 ft)
According to the text, what is the maximum ampere rating allowed for a receptacle installed for electric discharge lighting?
Based on 410.62(C)
According to Table 210.21(B)(3), what is the receptacle rating for a circuit with a circuit rating of 30 amperes?
40 or 50 amperes
According to the text, what is the maximum ampere rating allowed for a range receptacle?
Based on a single range demand load as specified in Table 220.55
Which of the following spaces would be considered as wall space according to the text?
A space with a sliding panel
Which of the following is NOT counted as wall space according to the text?
Receptacle outlets in or on floors
Which of the following is true about receptacle outlets installed for countertop and similar work surfaces?
They are not considered as the required receptacle outlets for adjacent wall spaces
In the kitchen, which of the following areas should be served by the two or more 20-ampere small-appliance branch circuits?
All of the above
Which one of these is the most correct?
A single receptacle on a 20-ampere individual branch circuit must be rated at 20 amperes
Which one of these is the most correct?
A receptacle shall not supply a total cord-and-plug-connected load in excess of the maximum specified in Table 210.21(B)(2)
Which one of these is the most correct?
Receptacle ratings shall not be less than the values listed in Table 210.21(B)(3)
Which of the following areas does NOT require a lighting outlet to be controlled by a listed wall-mounted control device?
Living rooms
According to Exception No. 2, what type of device can be used to control lighting outlets?
Motion sensors
What is the maximum number of receptacles controlled by a listed wall-mounted control device that can be installed in lieu of lighting outlets in areas other than kitchens, laundry areas, and bathrooms?
1
Which of the following is NOT a requirement for receptacle outlets on countertops and work surfaces in kitchens?
Supplied by the two (more are permitted) required 20-ampere small-appliance branch circuits and GFCI protected according to 210.8(A)(6)
According to Exception No. 1, what is the minimum ampacity required for tap conductors supplying individual outlets, other than receptacle outlets, with taps not over 450 mm (18 in.) long?
10 amperes
What is the maximum voltage allowed for outdoor outlets, according to the text?
120 volts
Which of the following locations is permitted to have receptacles placed in accessible locations that are compatible with permanent furniture?
All of the above
Which of the following is NOT a requirement for receptacle outlets in bathrooms?
The receptacle outlet shall be located on the countertop.
In which of the following locations are two readily accessible receptacle outlets required without requiring the movement of furniture to access those receptacles?
Guest rooms and guest suites of hotels and motels
Which of the following is NOT counted as wall space according to the text?
The space behind a corner-mounted configuration
What is the minimum distance required between a show window and a receptacle outlet according to the NEC?
450 mm (18 in.)
What is the maximum ampacity required for conductors tapped from a branch circuit not exceeding 50 amperes supplying electric ranges, wall-mounted electric ovens, and counter-mounted electric cooking units?
40 amperes
Where should a 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet be installed for equipment requiring servicing according to the NEC?
Within 7.5 m (25 ft) of the equipment
What is the maximum distance allowed between receptacle outlets along a wall line?
8 feet
Which of the following is NOT a requirement for receptacle outlets in outdoor areas?
The receptacle outlet must be accessible by a person standing at grade level
How many outdoor receptacle outlets are required for each dwelling unit in a one-family or two-family dwelling?
Two
In a multifamily dwelling, where should the receptacle outlet be installed for each dwelling unit located at grade level and provided with individual exterior entrance/egress?
At the front and back of the dwelling
What is the maximum height allowed for a receptacle outlet on a balcony, deck, or porch?
6 1/2 feet
According to the text, where are receptacle outlets required to be installed in garages of one- and two-family dwellings?
In each vehicle bay and not more than 1.7 m (51/2 ft) above the floor
According to the text, where are receptacle outlets required to be installed in accessory buildings with electric power?
In each accessory building with electric power
According to the text, where are receptacle outlets required to be installed in separate unfinished portions of basements?
In each separate unfinished portion of a basement
According to the text, where are receptacle outlets required to be installed in hallways of dwelling units?
In hallways of 3.0 m (10 ft) or more in length
According to the text, in one- and two-family dwellings, how many outdoor receptacle outlets are required at the front and back of the structure in accordance with 210.52(E)?
2
According to the text, where should the required receptacle outlet be located in one- and two-family dwellings for equipment requiring dedicated equipment spaces as specified in 110.26(E)?
Within the same room or area as the electrical equipment
According to the text, what is the purpose of the required receptacle outlet in meeting rooms of not more than 93 m2 (1000 ft2) in other than dwelling units?
To facilitate the use of portable test and diagnostic equipment
According to the text, what is the minimum distance required for a floor receptacle outlet or floor outlet to serve a receptacle(s) in a meeting room with any floor dimension that is 3.7 m (12 ft) or greater in any direction and that has a floor area of at least 20 m2 (215 ft2)?
3.7 m (12 ft) from any fixed wall
Test your knowledge on electrical system identification methods and their importance in ensuring safety for personnel. Explore alternative marking and tagging techniques to maintain consistency in premises with multiple voltage systems.
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