Lesson 3: Branch Circuits II

A multiwire branch circuit for an individual piece of utilization equipment supplies a line-to-neutral load.

Acceptable 210.4(C) Exception No. 1

Which of the following receptacles is/are permitted to be on the small appliance branch circuits?

II. only 210.52

Receptacles mounted in or on floors, located within 18 inches of a bedroom wall in a dwelling unit, are permitted to be counted as the receptacle outlets required by 210.52.

True 210.52(A)(3)

A receptacle outlet assembly installed in a countertop or work surface must be listed for the application.

True 210.52(C)(5)

The equipment grounding conductor, when installed with the branch-circuit conductors, is not permitted to be ? .

a continuous white outer finish 250.119

The general rule for receptacle outlets requires that no point on a wall space be more than ? from an outlet.

6' 210.52(A)(1)

Which of the following statements is/are true when applied to the small appliance branch circuit? I. No kitchen area lighting is permitted to be connected to either of the two small appliance branch circuits. II. The kitchen refrigerator is permitted to be on one of the small appliance branch circuits.

Both I. and II. 210.52(B)

All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices installed in dwelling unit kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas shall be protected by a listed combination-type arc-fault circuit interrupter, installed to provide protection of the entire branch circuit.

False 210.12(A)

A pull-chain porcelain lampholder is installed as the lighting fixture for unit maintenance directly in front of an air-conditioning unit located in the attic space of a commercial building. The equipment is not located near the attic entrance. The pull-chain is the sole means of control for the porcelain lampholder.

Violation 210.70(C)

Branch circuit conductors serving a noncontinuous load of 10 amperes are protected by a 30-ampere overcurrent protective device. How much continuous load can generally be added to the circuit?

16

A 480-volt branch circuit is permitted to supply the ballasts for electric-discharge lighting on a tunnel when the mounting height of the luminaires is not less than ? .

18' 210.6(D)(1)b

A dwelling unit has a front entrance on the east side of the house, a front entrance garage with overhead garage doors, a rear entrance door on the west side of the house, and a side entrance door on the south side of the house. All entrances provide grade level access. How many wall switch-controlled lighting outlets are required for the outside entrances?

3 210.70(A)(2)(2)

Hallways in dwelling units must have a receptacle outlet if the length, measured along the centerline of the hallway without passing through a doorway, is ? or more.

10' 210.52(H)

In general, a receptacle outlet shall be installed at each kitchen wall countertop and work surface that is ? or wider.

12" 210.52(C)(1)

In dwelling units, the voltage between conductors that supply luminaires shall not exceed ? .

120 V 210.6(A)(1)

A 125-volt, single-phase, 15- or 20-ampere rated receptacle installed for servicing AC equipment for a commercial building is required to be located on the same level and within ? of the equipment.

25' 210.63

Receptacle outlets shall be located on or above, but not more than ? above, the countertop or work surface.

500 mm (20") 210.52(C)(5)

What is the minimum number of receptacles required within 18 inches of the top of a show window with a horizontal measurement of 26 feet?

Answer is 2 210.62: 26/12=2.167 Round down to 2.

What is the minimum number of receptacles required within 18 inches of the top of a show window with a horizontal measurement of 33 feet?

Answer is 3 210.62: 33/12=2.75 Round up to 3.

At least one wall switch-controlled, ceiling-mounted lighting outlet shall be installed in each guest room of a hotel.

False 210.70(B)

A GFCI-type receptacle is not permitted to be used to replace a two-wire ungrounded type receptacle.

False 406.4(D)(2)(b)

All nonlockingtype, 125-volt, 15- and 20-ampere receptacles that are controlled by an automatic control device, or that incorporate control features that remove power from the receptacle for the purpose of energy management or building automation, shall be permanently marked with the symbol shown in ? and the word "controlled."

Figure 406.3(E) 406.3(E)

A 30-ampere multiple-outlet branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders in commercial installations.

True 210.23(B)

A 277/480-volt system and a 120/240-volt system are installed in the same raceway, each with its own neutral. The neutral for the 277/480-volt system has a continuous white outer finish. The neutral for the 120/240-volt system can be identified by conductor insulation, which is ? .

a continuous gray outer finish 200.6(D)(2)

Receptacles, ? , shall not be installed in a face-up position in countertops or similar work surfaces.

unless listed as receptacle assemblies for countertop applications 406.5(G)

What NEC Reference is used to determine the amount of receptacles required within 18 inches of the top of a show window?

210.62

Listed electric-discharge luminaires installed in commercial locations are permitted to be supplied by circuits exceeding 120 volts between conductors and not exceeding ? , nominal, to ground.

277 V 210.6(C)(1)

What is the number of floor line receptacles required in the kitchen and breakfast room areas of this dwelling unit? Bar counter is a free-standing peninsular type. Kitchen/Breakfast Area

5 The refrigerator receptacle does not count as a floor line receptacle. Receptacle placement is approximate. See NEC Reference sections 210.52(C)(1) and 210.52(C)(3).

What is the minimum number of required receptacles for these rooms? Bedroom 2

8 These receptacles are among those which must be protected by AFCI per 210.12(A). Receptacle placements are approximate and are shown for illustration and discussion. See NEC Reference section(s) 210.52(A)(1-4).

The lighting outlet in a dwelling unit bedroom consists of a table lamp that is cord-and-plug-connected to a wall switch-controlled duplex receptacle.

Acceptable 210.70(A)(1) Exception No. 1

The lighting outlet in a one-family dwelling attic is a porcelain pull-chain lampholder. The pull-chain on the lampholder is used as its means of control. The lampholder is located at the attic point of entrance.

Acceptable 210.70(A)(3)

Receptacles rated 15 amperes are installed in the bedroom area of a one-family dwelling unit on a general-purpose branch circuit protected by a 20-ampere breaker.

Acceptable Table 210.21(B)(3)

A 20-ampere branch circuit supplies two GFCI receptacle outlets in a dwelling unit bathroom and one outlet in the hallway.

Violation 210.11(C)(3)

Two small appliance branch circuits are installed in the kitchen and dining area of a one-family dwelling unit. One small appliance branch circuit feeds four countertop receptacles and one small appliance branch circuit feeds the garbage disposal, dishwasher, plus four floor line receptacles in the dining area.

Violation 210.52(B)(3)

A lighting outlet in a dwelling unit bedroom is controlled solely by an occupancy sensor without a manual override.

Violation 210.70(A)(1) Exception No. 2

The auxiliary equipment of electric-discharge lamps mounted in permanently installed luminaires installed as parking lot lighting for a shopping center is 480 volts, with the luminaires mounted on metal standards. The minimum distance permitted between the luminaire and the ground is ? .

22' 210.6(D)(1)a

At least one 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet is generally required to be installed within ? feet of the electrical service equipment. (An exception to this requirement states that the receptacle outlet shall not be required to be installed in one-and two-family dwellings.)

25 210.64

What is the minimum number of required receptacles for these rooms? Bedroom 1

5 These receptacles are among those which must be protected by AFCI per 210.12(A). Receptacle placements are approximate and are shown for illustration and discussion. See NEC Reference section(s) 210.52(A)(1-4).

Lighting outlets are required to be installed in the interior stairway of a dwelling unit. Where there is a difference between floor levels of ? risers or more, a wall switch to control the lighting outlet is generally required at each floor level and landing level which includes an entryway.

6 210.70(A)(2)(3)

In general, the maximum voltage between conductors permitted to supply cord-and-plug-connected equipment other than luminaires in industrial occupancies is ? .

600 V 210.6(D)(2)

What is the minimum countertop (CT is countertop area) and refrigerator receptacles required in the kitchen of this dwelling unit? The bar counter is a free-stand peninsular type. Kitchen/Breakfast Area

7 This question is only asking for the refrigerator and countertop receptacle placement. See NEC Reference sections 210.52(C)(1) through (5).

At least one outdoor receptacle outlet in a one-family dwelling is required to be installed so that the outlet is readlily accessible from grade and located not more than ? above grade level at the front and back of the dwelling.

6 1/2' 210.52(E)(1)

A receptacle which supplies power for supplemental equipment on a gas-fired range is installed on the two or more required small-appliance branch circuits.

Acceptable 210.52(B)(2) Exception No. 2