Understanding NEC Articles 215, 220, & 225

Question 1

Where a feeder supplies continuous loads or any combination of continuous and noncontinuous loads the conductor ampacity shall be no less than the noncontinuous load plus _____ of the continuous load.
Answer 1: 80 percent
Answer 2: 100 percent
Answer 3: 125 percent
Answer 4: 150 percent

Answer 1

Answer 3: 125 percent

215.2(A)(1)

Question 2

Where a portion of a feeder is connected at both its supply and load ends to separately installed pressure connections in accordance with 110.14(C)(2) it shall be permitted to have an allowable ampacity _____ the sum of the continuous load plus the noncontinuous load.
Answer 1: not less than
Answer 2: equal to
Answer 3: not greater than
Answer 4: of 80 percent of

Answer 2

Answer 1: not less than

215.2(A)(1) Ex 2

Question 3

Feeder grounded conductors not connected to an overcurrent device can be sized at _____ of the continuous and noncontinuous load.
Answer 1: 80 percent
Answer 2: 100 percent
Answer 3: 125 percent
Answer 4: 150 percent

Answer 3

Answer 2: 100 percent

215.2(A)(1) Ex 3

Question 4

Where a feeder supplies branch circuits in which equipment grounding conductors are required the feeder shall include an _____ to which the equipment grounding conductors of the branch circuits shall be connected.
Answer 1: equipment grounding conductor
Answer 2: grounding conductor
Answer 3: bonding conductor
Answer 4: grounded conductor

Answer 4

Answer 1: equipment grounding conductor

215.6

Question 5

Where a premises wiring system contains feeders supplied from more than one nominal voltage system each ungrounded conductor of a feeder shall be identified by phase or line and system by _____ or other approved means.
Answer 1: color coding
Answer 2: marking tape
Answer 3: tagging
Answer 4: any of these

Answer 5

Answer 4: any of these

215.12(C)(1)(a)

Question 6

Where a feeder supplies dwelling units the required SPD shall be a _____.
Answer 1: Type 1
Answer 2: Type 1 or 2
Answer 3: Type 3
Answer 4: any of these

Answer 6

Answer 2: Type 1 or 2

215.18(C)

Question 7

Where dwelling units are supplied by a feeder and the distribution equipment is ____ the required Type 1 or Type 2 SPD shall be installed.
Answer 1: replaced
Answer 2: repaired
Answer 3: due for maintenance
Answer 4: replaced or repaired

Answer 7

Answer 1: replaced

215.18(D)

Question 8

Where dwelling units are supplied by a feeder the required SPD shall have a nominal discharge current rating (In) of not less than _____.
Answer 1: 5 kA
Answer 2: 7.50 kA
Answer 3: 10 kA
Answer 4: the available fault current

Answer 8

Answer 3: 10 kA

215.18 (E)

Question 9

Article _____ provides requirements for calculating branch-circuit feeder and service loads.
Answer 1: 200
Answer 2: 210
Answer 3: 220
Answer 4: 230

Answer 9

Answer 3: 220

220.1

Question 10

When calculations in Article 220 result in a fraction of an ampere that is less than _____ such fractions can be dropped.
Answer 1: 0.49
Answer 2: 0.5
Answer 3: 0.51
Answer 4: 0.8

Answer 10

Answer 2: 0.5

220.5(B)

Question 11

Article 215 provides the installation overcurrent protection and conductor sizing requirements for _____ not over 1000V ac 1500V dc nominal.
Answer 1: outside branch circuits
Answer 2: branch circuits
Answer 3: ungrounded conductors
Answer 4: feeders

Answer 11

Answer 4: feeders

215.1

Question 12

Outlets supplying luminaires shall be calculated based on the maximum _____ rating of the equipment.
Answer 1: power
Answer 2: true power
Answer 3: voltage
Answer 4: volt-ampere

Answer 12

Answer 4: volt-ampere

220.14(D)

Question 13

Sign and outline lighting outlets are to be calculated at a minimum of _____ for each required branch circuit specified in 600.5(A).
Answer 1: 1000 VA
Answer 2: 1200 VA
Answer 3: 1500 VA
Answer 4: 2000 VA

Answer 13

Answer 2: 1200 VA

220.14(F)

Question 14

Show window loads shall be calculated at _____ per linear ft of show window.
Answer 1: 90 VA
Answer 2: 120 VA
Answer 3: 200 VA
Answer 4: 240 VA

Answer 14

Answer 3: 200 VA

220.14(G)(2)

Question 15

Nondwelling unit motors rated less than _____ and connected to a lighting circuit shall be considered general lighting load.
Answer 1: 1⁄16 hp
Answer 2: 1⁄8 hp
Answer 3: 1⁄4 hp
Answer 4: 1⁄3 hp

Answer 15

Answer 2: 1⁄8 hp

220.42(A)

Question 16

The lighting load unit values of Table 220.42(A) are based on minimum load conditions and _____ power factor and might not provide sufficient capacity for the installation contemplated.
Answer 1: 80 percent
Answer 2: 85 percent
Answer 3: 90 percent
Answer 4: 92 percent

Answer 16

Answer 1: 80 percent

220.42(A) Note

Question 17

The general lighting load for a school is _____.
Answer 1: 1.50 VA/ft²
Answer 2: 2.50 VA/ft²
Answer 3: 3 VA/ft²
Answer 4: 3.50 VA/ft²

Answer 17

Answer 1: 1.50 VA/ft²

220.42(A) Table

Question 18

The 125 percent multiplier for a continuous load as specified in 210.20(A) _____ included when using the unit loads in table 220.42(A) for calculating the minimum lighting load for a specified occupancy.
Answer 1: is
Answer 2: is not
Answer 3: is permitted to be
Answer 4: shall not be

Answer 18

Answer 1: is

220.42(A) Table Note

Question 19

For other than dwelling units or guest rooms of hotels or motels the feeder and service calculation for track lighting shall be calculated at 150 VA for every _____ of lighting track or fraction thereof.
Answer 1: 1 ft
Answer 2: 2 ft
Answer 3: 3 ft
Answer 4: 4 ft

Answer 19

Answer 2: 2 ft

220.46(B)

Question 20

For dwelling unit load calculations in accordance Article 220 a load of not less than _____ for each 2-wire small-appliance branch circuit shall be applied.
Answer 1: 1000 VA
Answer 2: 1200 VA
Answer 3: 1500 VA
Answer 4: 2000 VA

Answer 20

Answer 3: 1500 VA

220.52(A)

Question 21

For dwelling unit load calculations in accordance Article 220 a load of not less than _____ for the laundry branch circuit shall be applied.
Answer 1: 1000 VA
Answer 2: 1200 VA
Answer 3: 1500 VA
Answer 4: 2000 VA

Answer 21

Answer 3: 1500 VA

220.52(B)

Question 22

When sizing a service or feeder for fixed appliances in dwelling units a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place.
Answer 1: two
Answer 2: three
Answer 3: four
Answer 4: five

Answer 22

Answer 3: four

220.53

Question 23

Applying a demand factor of 75 percent to the nameplate rating load of four or more appliances rated 1⁄4 hp or greater or 500 watts or greater that are fastened in place and that are served by the same feeder or service in a one-family two-family or multifamily dwelling shall be permitted. This demand factor shall not apply to _____.
Answer 1: electric vehicle supply equipment
Answer 2: dishwashers
Answer 3: waste disposals
Answer 4: microwave/hoods

Answer 23

Answer 1: electric vehicle supply equipment

220.53(5)

Question 24

Using the standard load calculation method the feeder demand factor for a duplex containing two 12 kW ranges is _____.
Answer 1: 11 kW
Answer 2: 14 kW
Answer 3: 16 kW
Answer 4: 24 kW

Answer 24

Answer 1: 11 kW

220.55 Table Column C

Question 25

For dwelling unit load calculations in accordance Article 220 the branch-circuit load for one wall-mounted oven and one counter-mounted cooking unit shall be the _____ rating of the appliance. Answer 1: nameplate Answer 2: ampere Answer 3: wattage Answer 4: voltage

Answer 25

Answer 1: nameplate | 220.55 Table Note 5

Question 26

Table 220.56 may be applied to determine the load for thermostatically controlled or intermittently used _____ and other kitchen equipment in a commercial kitchen. Answer 1: commercial electric cooking equipment Answer 2: dishwasher booster heaters Answer 3: water heaters Answer 4: all of these

Answer 26

Answer 4: all of these | 220.56

Question 27

When applying the demand factors of Table 220.56 the feeder or service demand load shall not be less than the sum of the _____. Answer 1: total number of receptacles at 180 VA per receptacle outlet Answer 2: VA ratings of all of the small-appliance branch circuits combined Answer 3: largest two kitchen equipment loads Answer 4: kitchen heating and air-conditioning loads

Answer 27

Answer 3: largest two kitchen equipment loads | 220.56

Question 28

The electrical vehicle supply equipment (EVSE) load shall be calculated at the larger of _____ or the nameplate rating of the equipment. Answer 1: 5000W Answer 2: 7200W Answer 3: 10000W Answer 4: 12500W

Answer 28

Answer 2: 7200W | 220.57

Question 29

If a motor or air-conditioning load is part of the noncoincident load and is not the largest of the noncoincident loads 125 percent of either the motor load or air-conditioning load whichever is _____ shall be used in the calculation. Answer 1: less Answer 2: smaller Answer 3: larger Answer 4: less or smaller

Answer 29

Answer 3: larger | 220.60

Question 30

There shall be no reduction in the size of the neutral or grounded conductor on _____ loads supplied from a 4-wire wye-connected three-phase system. Answer 1: dwelling unit Answer 2: hospital Answer 3: nonlinear Answer 4: motel

Answer 30

Answer 3: nonlinear | 220.61(C)(2)

Question 31

Under the optional method for calculating a single-family dwelling unit service general loads beyond the initial 10 kVA are assessed at a _____ demand factor. Answer 1: 40 percent Answer 2: 50 percent Answer 3: 60 percent Answer 4: 75 percent

Answer 31

Answer 1: 40 percent | 2020.82(B)

Question 32

A demand factor of _____ applies to a multifamily dwelling with ten units if the optional calculation method is used. Answer 1: 43 percent Answer 2: 50 percent Answer 3: 60 percent Answer 4: 75 percent

Answer 32

Answer 1: 43 percent | 220.84(A) Table

Question 33

Where two dwelling units are supplied by a single feeder or service and the calculated load under Part III of this article exceeds that for _____ identical units calculated under 220.84 the lesser of the two loads is permitted to be used. Answer 1: two Answer 2: three Answer 3: four Answer 4: five

Answer 33

Answer 2: three | 220.85

Question 34

When calculating a feeder or service load for existing installations if the maximum demand data for a 1-year period is not available the calculated load shall be permitted to be based on the maximum demand (the _____ kilowatts) reached and maintained for a 15-minute interval continuously recorded over a minimum 30-day period. Answer 1: lowest recorded Answer 2: highest recorded Answer 3: lowest average Answer 4: highest average

Answer 34

Answer 4: highest average | 220.87(1) Ex

Question 35

In accordance with Article 220 the demand factor for a marina service or feeder with 45 shore power receptacles is _____. Answer 1: 40 percent Answer 2: 50 percent Answer 3: 60 percent Answer 4: 70 percent

Answer 35

Answer 2: 50 percent | 220.120

Question 36

Article _____ covers requirements for outside branch circuits and feeders not over 1000V ac or 1500V dc nominal run on or between buildings structures or poles on the premises. Answer 1: 200 Answer 2: 210 Answer 3: 220 Answer 4: 225

Answer 36

Answer 4: 225 | 225.1

Question 37

In accordance with Article 225 – Outside Branch Circuits and Feeders open individual conductors shall not be smaller than _____ copper for spans up to 50 ft in length and _____ copper for a longer span unless supported by a messenger wire. Answer 1: 10 AWG 8 AWG Answer 2: 8 AWG 8 AWG Answer 3: 6 AWG 8 AWG Answer 4: 6 AWG 6 AWG

Answer 37

Answer 1: 10 AWG 8 AWG | 225.6(A)(1)

Question 38

The point of attachment of overhead premises wiring to a building shall in no case be less than _____ above finished grade. Answer 1: 8 ft Answer 2: 10 ft Answer 3: 12 ft Answer 4: 15 ft

Answer 38

Answer 2: 10 ft | 225.16(A) and 230.256

Question 39

Where a mast is used for overhead branch-circuit or feeder conductor support it shall have adequate _____ or be supported by braces or guy wires to safely withstand the strain imposed by the conductors. Answer 1: strength Answer 2: mobility Answer 3: length Answer 4: size

Answer 39

Answer 1: strength | 225.17(A)

Question 40

Overhead feeder and/or branch-circuit conductors shall not be attached to a mast where the connection is _____ a weatherhead or the end of the conduit and a coupling where the coupling is located above the last point of securement to the building or other structure or where the coupling is located above the building or other structure. Answer 1: above Answer 2: below Answer 3: between Answer 4: even with

Answer 40

Answer 3: between | 225.17(B)

Question 41

Overhead feeder conductors shall have a minimum vertical clearance of _____ over residential property and driveways as well as those commercial areas not subject to truck traffic where the voltage does not exceed 300V to ground. Answer 1: 10 ft Answer 2: 12 ft Answer 3: 15 ft Answer 4: 18 ft

Answer 41

Answer 2: 12 ft | 225.18(2)

Question 42

If a set of 120/240V overhead feeder conductors terminates at a through-the-roof raceway or approved support with not more than 6 ft of these conductors 4 ft horizontally passing over the roof overhang the minimum clearance above the roof for these conductors shall not be less than _____. Answer 1: 12 in. Answer 2: 18 in. Answer 3: 2 ft Answer 4: 5 ft

Answer 42

Answer 2: 18 in. | 225.19(A) Ex 3

Question 43

The requirement for maintaining a 3-ft vertical clearance from the edge of the roof shall not apply to the final feeder conductor span where the conductors are attached to _____. Answer 1: a building pole Answer 2: the side of a building Answer 3: an antenna Answer 4: the base of a building

Answer 43

Answer 2: the side of a building | 225.19(A) Ex 4

Question 44

Overhead feeder and branch-circuit clearances from chimneys radio and television antennas tanks and other nonbuilding or nonbridge structures shall not be less than _____. Answer 1: 3 ft Answer 2: 6 ft Answer 3: 8 ft Answer 4: 10 ft

Answer 44

Answer 1: 3 ft | 225.19(B)

Question 45

The vertical clearance of final spans of overhead conductors above or within _____ measured horizontally of platforms projections or surfaces that will permit personal contact shall be maintained in accordance with 225.18. Answer 1: 3 ft Answer 2: 6 ft Answer 3: 8 ft Answer 4: 10 ft

Answer 45

Answer 1: 3 ft | 225.19(D)(2)

Question 46

Overhead branch-circuit and feeder conductors shall not be installed beneath openings through which materials may be moved such as openings in farm and commercial buildings and shall not be installed where they obstruct _____ these openings. Answer 1: entrance to Answer 2: egress from Answer 3: access to Answer 4: a safe descent from

Answer 46

Answer 1: entrance to | 225.19(D)(3)

Question 47

In accordance with Article 225 – Outside Branch Circuits and Feeders raceways on exteriors of buildings or other structures shall be arranged to drain and shall be _____ for use in wet locations. Answer 1: labeled Answer 2: listed Answer 3: approved Answer 4: listed or approved

Answer 47

Answer 4: listed or approved | 225.22

Question 48

In accordance with Article 225 – Outside Branch Circuits and Feeders vegetation such as trees shall not be used for support of _____. Answer 1: overhead conductor spans Answer 2: surface wiring methods Answer 3: luminaires Answer 4: electric equipment

Answer 48

Answer 1: overhead conductor spans | 225.26

Question 49

Where a raceway enters a(an) _____ from outside it shall be sealed in accordance with 300.5(G) and 300.7(A). Answer 1: building or structure Answer 2: crawlspace Answer 3: highway right-of-way Answer 4: easement

Answer 49

Answer 1: building or structure | 225.27

Question 50

Where more than one outside feeder is installed in accordance with 225.30(B) all feeder disconnects in the building shall be _____ in the same location. Answer 1: grouped Answer 2: identified Answer 3: labeled Answer 4: grouped and labeled

Answer 50

Answer 1: grouped | 225.30(B)

Question 51

In accordance with Article 225 – Outside Branch Circuits and Feeders the disconnecting means for a building supplied by a feeder shall be installed at a(an) _____ location. Answer 1: accessible Answer 2: readily accessible Answer 3: outdoor Answer 4: indoor

Answer 51

Answer 2: readily accessible | 225.31(B)

Question 52

In accordance with Article 225 – Outside Branch Circuits and Feeders there shall be no more than _____ switches or circuit breakers to serve as the disconnecting means for a building supplied by a feeder. Answer 1: two Answer 2: four Answer 3: six Answer 4: eight

Answer 52

Answer 3: six | 225.33(A)

Question 53

In accordance with Article 225 – Outside Branch Circuits and Feeders the two to six disconnects for a disconnecting means for a building supplied by a feeder shall be _____. Answer 1: the same size Answer 2: grouped Answer 3: in the same enclosure Answer 4: of the same manufacturer

Answer 53

Answer 2: grouped | 225.34(A)

Question 54

Where a building has multiple outside feeders a permanent _____ shall be installed at each outside feeder disconnect location denoting all other services and feeders and the area served by each. Answer 1: plaque or directory Answer 2: map Answer 3: label Answer 4: guide

Answer 54

Answer 1: plaque or directory | 225.37

Question 55

In accordance with Article 225 – Outside Branch Circuits and Feeders a building disconnecting means that supplies only limited loads of a single branch circuit shall have a rating of not less than _____. Answer 1: 15A Answer 2: 20A Answer 3: 25A Answer 4: 30A

Answer 55

Answer 1: 15A | 225.39A)

Question 56

In accordance with Article 225 – Outside Branch Circuits and Feeders for installations consisting of not more than two 2-wire branch circuits the building disconnecting means shall have a rating of not less than _____. Answer 1: 15A Answer 2: 20A Answer 3: 25A Answer 4: 30A

Answer 56

Answer 4: 30A | 225.39(B)

Question 57

For all other installations supplied by a feeder(s) or branch circuit(s) and not specifically identified in 225.39(A) through (C) the feeder or branch-circuit disconnecting means shall have a rating of not less than _____. Answer 1: 20A Answer 2: 30A Answer 3: 40A Answer 4: 60A

Answer 57

Answer 4: 60A | 225.39(D)

Question 58

The emergency disconnecting means for one-and two-family dwelling units supplied by an outside feeder shall be installed in a readily accessible outdoor location on or _____. Answer 1: within sight of the dwelling unit Answer 2: at the source of power Answer 3: in the panelboard Answer 4: closest to the entrance of the feeder cable assembly

Answer 58

Answer 1: within sight of the dwelling unit | 225.41(A)(1)

Question 59

The emergency disconnecting means for one- and two-family dwelling units supplied by an outside feeder shall have a short-circuit current rating equal to or greater than _____. Answer 1: 5 kAIC Answer 2: 10 kAIC Answer 3: 22 kAIC Answer 4: the available fault current

Answer 59

Answer 4: the available fault current | 225.41(A)(2)

Question 60

Where there is more than one emergency disconnecting means for one- and two-family dwelling units supplied by an outside feeder they shall be _____. Answer 1: separated Answer 2: adjacent to each other Answer 3: grouped Answer 4: away from each other

Answer 60

Answer 3: grouped | 225.41(A)(3)

Question 61

Where a feeder supplies _____ a surge-protective device (SPD) shall be installed. Answer 1: dwelling and dormitory units Answer 2: hotel and motel guest rooms and suites Answer 3: patient sleeping rooms of nursing homes and limited care facilities Answer 4: all of these

Answer 61

Answer 4: all of these | 225.42(A)

Question 62

SPD's required by 225.42(A) shall be installed _____ the distribution equipment that is connected to the load side of the feeder and contains branch circuit overcurrent protective device(s). Answer 1: in or adjacent to Answer 2: within 3 ft of Answer 3: within 10 ft of Answer 4: within sight of

Answer 62

Answer 1: in or adjacent to | 225.42(B)