Lesson 108 - Dwelling Circuit Requirements, Outlet Locations, and General Lighting Load Reading Worksheet

34

You are to connect as many 130-watt fluorescent luminaires as possible to a 20-amp 277-volt circuit. If these luminaires are operated continuously, the breaker can only carry 80% of its rating. For this 20-amp breaker this is 20 A × 80% = 16 A. How many luminaires, operated continuously, can be connected to this circuit?

None of these

___ may be used to raise worker height on a scaffold.

True

Convenience receptacles installed on the roof of a school are required to be GFCI protected.

2, 4, 11, 6, 7, 8 & 9 only

Range and Ref are located less than 6 ft. from the outside edge of the kitchen sink. Refer to Figure 108.014. Where this kitchen is in a house, which receptacles are required to be GFCI protected?

Use the next higher standard rating

According to NEC ® Section 240.4(B), if the ampacity of a conductor does not match up with a standard fuse rating, what are you allowed to do?

0

For a school the fewest number of receptacles permitted to be installed outdoors per the NEC ® is ___.

Ground Fault Circuit Interrupter

GFCI is an abbreviation (stands for) ___.

16

How many parking lot luminaires can be connected to a 20-amp circuit? Each luminaire will draw .954 amps at 480 volts. These luminaires WILL operate continuously.

does not permit

Section 406.5(G) in the NEC ® ___ receptacles to be installed "face-up" on kitchen or bathroom countertops.

both I & II

The Code requires which of the following residential receptacles to be GFCI protected? I. A receptacle installed on a garage ceiling for an automatic garage door operator II. A receptacle installed above a work table in a garage

12 AWG copper

Ignoring the effects of voltage drop, a 20-ampere branch circuit requires ___ conductors.

5

A convenience store is to have 68 fluorescent luminaires installed on the ceiling. Each of these luminaires will use 220 watts of power at 277 volts. You will need to install at least ___ 15-amp lighting circuits to supply these luminaires. This store is open from 5 a.m. to midnight so the lighting is "ON" continuously.

True

All 50-amp, 125-volt convenience receptacles installed in the walls in a commercial kitchen require GFCI protection.

GFCI protected

Although a residential basement is unfinished, the homeowner wants several receptacles to be installed. These receptacles are required to be ___.

Article 220

Article 210 applies to branch circuits, but branch-circuit calculations for the purpose of determining the size of a service or feeder are covered in ___.

6

For a single-family dwelling with a total of 3500 square feet of occupied area, the minimum number of 15-ampere lighting branch circuits is ___.

none are required

How many 20-amp small-appliance branch circuits are required by the NEC ® to supply power to countertops in commercial restaurant kitchens?

both a & b

Nominal voltage includes a range of actual circuit voltages that are ___ the nominal voltage.

cannot be painted, unless it is with a clear material

Planking on scaffolds ___.

125%

Refer to the Article 100 definition for continuous load in the NEC ®. According to 210.19(A) and 210.20(A), the branch-circuit conductors and overcurrent protection for a continuous load shall be sized at not less than ___ times the current drawn by the load.

the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)

The NEC ® defines a branch circuit as ___.

2

The fewest number of receptacles that can be installed outside on a house is ___.

II or III only

The maximum distance between the scaffold and the structure is ___. If you exceed this distance, you must install a standard guard rail. I. 16 inches for masons II. 14 inches III. 18 inches for plasterers and lathers

42

The maximum number of 130-watt, fluorescent luminaires that can be connected to a 20-Amp, 277-volt circuit is ___. This load is noncontinuous.

True

A convenience receptacle has been installed within a fenced equipment yard (inaccessible to the public) behind a hospital to meet the requirements of NEC ® Section 210.63 (servicing of equipment). This receptacle is required to be GFCI protected.

each day before using

How often should scaffolds be inspected?

10

In a dwelling a receptacle shall be installed in a hallway that measures ___ feet or more measured along the centerline of the hallway.

No

Is receptacle (9) required by the NEC ® to be installed here in this residential kitchen as shown above in Figure 108.016?

2

Refer to Figure 108.005. This is a plan view of a house. The fewest number of receptacles that can be installed in the 23 foot long wall space between points 2 and 3 is ___.

0

Refer to Figure 108.005. This is a plan view of a house. The fewest number of receptacles that can be installed inside the closet is ___. The wall space in the closet is 22 feet between point 5 around to point 6, measured clockwise.

Yes

Refer to Figure 108.010. In countertop space A, does the NEC ® require any receptacles to be installed if this is a residential kitchen?

No

Refer to Figure 108.010. This kitchen is in a preschool facility. In countertop space B does the NEC ® require any receptacles to be installed?

at least 2

Refer to Figure 108.010. This kitchen layout is in a house. The NEC ® requires ___ receptacles to be installed in countertop space D.

at least 1

Refer to Figure 108.010. This kitchen layout is in a house. The NEC ® requires ___ receptacles to be installed in wall space G.

210.52(A)(3)

Section ___ in the NEC ® states that, for dwellings: "Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets unless located within 450 mm (18 in.) of the wall."

210.52(B)(3)

Section ___ in the NEC ® states that, for dwellings: "Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by not fewer than two small-appliance branch circuits, either or both of which shall also be permitted to supply receptacle outlets in the same kitchen and in other rooms specified in 210.52(B)(1)."

120

What is the maximum number of recessed luminaires that can be installed on a 20-amp 277-volt branch circuit? Each luminaire will draw 36.8 watts at 277 volts. These luminaires WILL be operated continuously.

bathroom

Which areas in a residence require a switch-controlled lighting outlet instead of a switch-controlled receptacle?

Yes

Figure 108.016, shown above, is a residential kitchen. Receptacles (2) & (4) are located as shown. Will another receptacle be required by the NEC ® to be installed in wall space between these two receptacles?

12

Generally, for dwellings, receptacles are installed in a room so that they are within ___ feet of each other.

10 feet

How long must a hallway in a dwelling be to require at least one receptacle outlet?

at least one

In a dwelling (such as your house) how many 20-amp branch circuits are required by the NEC ® to supply power to an area where a clothes washing machine is to be plugged into a receptacle?

True

In a dwelling at least one receptacle shall be installed to serve the countertop of a peninsula or island in a kitchen or dining room when the peninsula or island has a long dimension of 24 in. (600 mm) or greater, and a short dimension of 12 in. (300 mm) or greater.

All the receptacles

Range and Ref are located less than 6 ft. from the outside edge of the kitchen sink. Refer to Figure 108.014. This kitchen is in Maria's TexMex Restaurant ( not a dwelling). Which receptacles are required to be GFCI protected?

Yes

Refer to Figure 108.010. If a receptacle is installed in countertop space D, does the NEC ® require it to be GFCI protected? This kitchen layout is in a house.

125%

Refer to the Article 100 definition for continuous load in the NEC ®. According to 210.20(A) the overcurrent protection for a continuous load shall be sized at not less than ___ of the current drawn by the load.

False

Section 210.52 in the NEC ® provides location requirements for receptacle outlets in restaurants.

210.52(A)(2)(2)

Section ___ in the NEC ® requires that, for determining receptacle placement in dwellings, a wall space includes the space occupied by fixed panels in walls but excludes sliding panels.

No

The plan view for part of a house is shown above in Figure 108.007. The walls separating the living room and the dining room are only 3 feet in height. The distance between points mc009-1.jpg and mc009-2.jpg is 11 feet. Although the homeowner does not want any receptacles installed in the 3-foot-long "half wall" at mc009-3.jpg, does the NEC ® require a receptacle to be installed?

1

The plan view for the basement of a house is shown below. The dimensions are shown on the drawing. The fewest number of receptacles that can be installed in the basement is ___.

True

When calculating loads to determine the size of a service, the lighting load in volt-amps is calculated by multiplying the floor area times the value shown in Table 220.12 of the NEC ®.

15

Where 10 AWG THHN/THWN copper circuit conductors are connected to a 15-amp circuit breaker, the circuit is considered to be a ___-amp branch circuit.

14

Where a branch circuit is protected with a 15-amp circuit breaker, the smallest circuit conductors that can be installed are ___ awg copper.

10

Where a branch circuit is protected with a 30-amp circuit breaker, the smallest circuit conductors that can be installed are ___ awg copper.

2 feet

In a dwelling, what is the minimum width of a wall space that requires a receptacle outlet?

0

In a restaurant ___ receptacles should be installed along a 15-foot long kitchen countertop per the minimum requirements in the NEC ®.

electrician

In construction of one- and two-family dwellings, the quantity and rating of electrical circuits is usually designed by the ___.

ampacity

In general, ___ of a conductor must not be less than the rating of the overcurrent device protecting the conductor.

112

What is the maximum number of recessed luminaires that can be installed on a 15-amp 277-volt branch circuit? Each luminaire will draw 36.8 watts at 277 volts. These luminaires will NOT be operated continuously. DO NOT multiply anything times 1.25 !!! DO NOT divide anything by .8 !!!

a competent person

Dissimilar metals and other manufacturer's scaffold parts and materials can't be intermixed unless ___ determines that it is safe to do so.

no

Does the NEC ® permit a wall-switch-controlled receptacle to be used for lighting an attic space in a dwelling? A portable lamp or drop light, for example, could be plugged into the receptacle. The attic space contains air conditioning equipment that requires servicing.

a single receptacle installed to serve a permanently installed alarm system

The Code generally requires receptacles installed in an unfinished basement to be GFCI protected. The exception(s) to the general rule includes ___.

11

What is the minimum number of 20-amp 277-volt branch circuits required where 810 incandescent luminaires are to be installed? The lamps to be installed are rated at 75 watts at 277 volts. This is NOT a continuous load so each circuit can carry 20 amps maximum.

2

What is the minimum number of 20-ampere branch circuits for small appliances required in a residence?

the ampere rating of the overcurrent device

Branch circuits are rated according to ___.

I, II & III

Branch circuits that serve a ___ are required to be rated at 20 amperes where installed in a house. I. bathroom II. kitchen III. laundry room

zero

Refer to Figure 108.010. This layout is for the kitchen in a restaurant. The NEC ® requires ___ receptacles to be installed in countertop space C.

Yes

Refer to Figure 108.014. This kitchen is in a house. Does the NEC ® permit receptacle 11 to be connected to a circuit that is not one of the 20-amp small-appliance branch circuits?