Understanding NEC Article 230

Question 1

The Code does not cover installations under the exclusive control of an electric utility such as _____.
Answer 1 service drops or service laterals
Answer 2 electric utility office buildings
Answer 3 electric utility warehouses
Answer 4 electric utility garages

Answer 1

Answer 1 service drops or service laterals

90.2(D)(5)(a)

Question 2

A service drop is defined as the overhead conductors between the serving utility and the _____.
Answer 1 service equipment
Answer 2 service point
Answer 3 grounding electrode conductor
Answer 4 equipment grounding conductor

Answer 2

Answer 2 service point

100 Service Drop

Question 3

The underground conductors between the utility electric supply system and the service point are known as the _____.
Answer 1 utility service
Answer 2 service lateral
Answer 3 service drop
Answer 4 main service conductors

Answer 3

Answer 2 service lateral

100 Service Lateral

Question 4

The _____ is the point of connection between the facilities of the serving utility and the premises wiring.
Answer 1 service entrance
Answer 2 service point
Answer 3 overcurrent protection
Answer 4 beginning of the wiring system

Answer 4

Answer 2 service point

100 Service Point

Question 5

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 5

Answer 3 125 percent

215.2(A)(1)

Question 6

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 6

Answer 2 100 percent

215.2(A)(1) Ex 3

Question 7

Service conductors and equipment for control and protection of services not over 1000V ac or 1500V dc nominal and their installation requirements are covered in Article _____.
Answer 1 210
Answer 2 220
Answer 3 230
Answer 4 240

Answer 7

Answer 3 230

230.1

Question 8

If necessary to meet capacity requirements additional services are permitted for a single building or other structure by _____.
Answer 1 the registered design professional
Answer 2 special permission
Answer 3 the engineer of record
Answer 4 master electricians

Answer 8

Answer 2 special permission

230.2(C)(3)

Question 9

Additional services are permitted for different voltages frequencies or phases or for different uses such as for _____.
Answer 1 gymnasiums
Answer 2 different rate schedules
Answer 3 flea markets
Answer 4 special entertainment events

Answer 9

Answer 2 different rate schedules

230.2(D)

Question 10

Where a building or structure is supplied by more than _____ a permanent plaque or directory shall be installed at each service disconnect location denoting all other services supplying that building or structure and the area served by each.
Answer 1 one service
Answer 2 two services
Answer 3 three services
Answer 4 six services

Answer 10

Answer 1 one service

230.2(E)

Question 11

Service conductors supplying a building or other structure shall not _____ another building or other structure.
Answer 1 be installed on the exterior walls of
Answer 2 pass through the interior of
Answer 3 be installed underneath
Answer 4 span the roof of

Answer 11

Answer 2 pass through the interior of

230.3

Question 12

Service conductors shall be considered outside of a building or other structure where installed under not less than _____ of concrete beneath a building or other structure.
Answer 1 2 in.
Answer 2 4 in.
Answer 3 5 in.
Answer 4 6 in.

Answer 12

Answer 1 2 in.

230.6(1)

Question 13

Circuit conductors other than service conductors shall not be installed in the same _____ as the service conductors.
Answer 1 raceway or cable
Answer 2 handhole enclosure
Answer 3 underground box
Answer 4 all of these

Answer 13

Answer 4 all of these

230.7

Question 14

Where a service _____ enters a building or structure it shall be sealed in accordance with 300.5(G) and 300.7(A).
Answer 1 raceway
Answer 2 cable assembly
Answer 3 cable tray
Answer 4 any of these

Answer 14

Answer 1 raceway

230.8

Question 15

Service conductors installed as unjacketed multiconductor cable shall have a minimum clearance of _____ from windows that are designed to be opened doors porches balconies ladders stairs fire escapes or similar locations.
Answer 1 3 ft
Answer 2 4 ft
Answer 3 6 ft
Answer 4 10 ft

Answer 15

Answer 1 3 ft

230.9(A)

Question 16

The vertical clearance of final spans of overhead service conductors above or within _____ measured horizontally of platforms projections or surfaces that will permit personal contact shall be maintained.
Answer 1 3 ft
Answer 2 4 ft
Answer 3 5 ft
Answer 4 6 ft

Answer 16

Answer 1 3 ft

230.9(B)

Question 17

Overhead service 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 building openings.
Answer 1 entrance to
Answer 2 egress from
Answer 3 access to
Answer 4 a safe descent from

Answer 17

Answer 1 entrance to

230.9(C)

Question 18

Vegetation such as _____ shall not be used for support of overhead service conductors or service equipment.
Answer 1 shrubs
Answer 2 trees
Answer 3 potted plants
Answer 4 all of these

Answer 18

Answer 2 trees

230.10

Question 19

Service-drop conductors shall have _____.
Answer 1 sufficient ampacity to carry the load
Answer 2 adequate mechanical strength
Answer 3 sufficient ampacity to carry the load or adequate mechanical strength
Answer 4 sufficient ampacity to carry the load and adequate mechanical strength

Answer 19

Answer 4 sufficient ampacity to carry the load and adequate mechanical strength

230.23(A)

Question 20

The minimum size service-drop conductor permitted is _____ copper or _____ aluminum or copper-clad aluminum.
Answer 1 8 AWG 8 AWG
Answer 2 8 AWG 6 AWG
Answer 3 6 AWG 8 AWG
Answer 4 6 AWG 6 AWG

Answer 20

Answer 2 8 AWG 6 AWG

230.23(B)

Question 21

Overhead service conductors installed over roofs shall have a vertical clearance of not less than _____ above the roof surface.
Answer 1 3 ft
Answer 2 4 ft
Answer 3 5 ft
Answer 4 8 ft 6 in.

Answer 21

Answer 4 8 ft 6 in.

230.24(A)

Question 22

Where the voltage between conductors does not exceed 300 and the roof has a slope of 4 in. in 12 in. or greater a reduction in clearance to _____ over the roof is permitted.
Answer 1 3 ft
Answer 2 4 ft
Answer 3 5 ft
Answer 4 8 ft

Answer 22

Answer 1 3 ft

230.24(A) Ex 2

Question 23

Where the voltage between conductors does not exceed 300 a reduction in clearance above only the overhanging portion of the roof to not less than _____ shall be permitted if not more than 6 ft of overhead service conductors pass above the roof overhang 4 ft horizontally.
Answer 1 12 in.
Answer 2 18 in.
Answer 3 2 ft
Answer 4 5 ft

Answer 23

Answer 2 18 in.

230.24(A) Ex 3

Question 24

The requirement to maintain a 3-foot vertical clearance from the edge of a roof does not apply to the final conductor span where the service drop is attached to _____.
Answer 1 a service pole
Answer 2 the side of a building
Answer 3 an antenna
Answer 4 the base of a building

Answer 24

Answer 2 the side of a building

230.24(A) Ex 4

Question 25

Overhead service conductors shall have a minimum clearance from final grade of _____ above areas or sidewalks accessible only to pedestrians measured from final grade or other accessible surface where the voltage does not exceed 150V to ground. Answer 1 8 ft Answer 2 10 ft Answer 3 12 ft Answer 4 15 ft

Answer 25

Answer 2 10 ft | 230.24(B)(1)

Question 26

Overhead service conductors shall have a minimum vertical clearance of _____ from final grade over residential property and driveways as well as over 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 26

Answer 2 12 ft | 230.24(B)(2)

Question 27

The minimum clearance for overhead service conductors that pass over public streets alleys roads parking areas subject to truck traffic is _____. Answer 1 10 ft Answer 2 12 ft Answer 3 15 ft Answer 4 18 ft

Answer 27

Answer 4 18 ft | 230.24(B)(4)

Question 28

The minimum point of attachment of overhead service conductors to a building shall not be less than _____ above finished grade. Answer 1 8 ft Answer 2 10 ft Answer 3 12 ft Answer 4 15 ft

Answer 28

Answer 2 10 ft | 230.26

Question 29

Where conduits are used as service masts hubs shall be _____ for use with service-entrance equipment. Answer 1 identified Answer 2 approved Answer 3 of a heavy-duty type Answer 4 listed

Answer 29

Answer 1 identified | 230.28(A)

Question 30

Underground service conductors shall have _____. Answer 1 adequate mechanical strength Answer 2 no splices Answer 3 90°C conductors Answer 4 sufficient ampacity for the loads calculated

Answer 30

Answer 4 sufficient ampacity for the loads calculated | 230.31(A)

Question 31

Underground copper service conductors shall not be smaller than _____. Answer 1 3 AWG Answer 2 4 AWG Answer 3 6 AWG Answer 4 8 AWG

Answer 31

Answer 4 8 AWG | 230.31(B)

Question 32

Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than _____. Answer 1 14 AWG copper Answer 2 14 AWG aluminum Answer 3 12 AWG copper Answer 4 12 AWG aluminum

Answer 32

Answer 3 12 AWG copper | 230.31(B) Ex

Question 33

Underground service conductors shall be protected from damage in accordance with _____ including minimum cover requirements. Answer 1 240.6(A) Answer 2 300.5 Answer 3 310.16 Answer 4 430.52

Answer 33

Answer 2 300.5 | 230.32

Question 34

The general requirement for each service drop set of overhead service conductors set of underground service conductors or service lateral is that it shall supply _____ set(s) of service-entrance conductors. Answer 1 only one Answer 2 only two Answer 3 up to six Answer 4 an unlimited number of

Answer 34

Answer 1 only one | 230.40

Question 35

One set of service-entrance conductors connected to the _____ side of the normal service disconnecting means shall be permitted to supply each or several systems covered by 230.82(5) or 230.82(6). Answer 1 supply Answer 2 load Answer 3 high Answer 4 low

Answer 35

Answer 1 supply | 230.40 Ex 5

Question 36

The minimum service-entrance conductor size shall have an ampacity not less than the maximum load to be served after the application of any _____ factors. Answer 1 adjustment Answer 2 correction Answer 3 demand Answer 4 adjustment or correction

Answer 36

Answer 4 adjustment or correction | 230.42(A)(2)

Question 37

Wiring methods permitted for service-entrance conductors include _____. Answer 1 Type IGS cable Answer 2 Type NM cable Answer 3 Type UF cable Answer 4 all of these

Answer 37

Answer 1 Type IGS cable | 230.43(2)

Question 38

Wiring methods permitted for service-entrance conductors include _____. Answer 1 rigid metal conduit Answer 2 electrical metallic tubing Answer 3 PVC conduit Answer 4 all of these

Answer 38

Answer 4 all of these | 230.43(3), (5), and (11)

Question 39

Power distribution blocks installed on service conductors shall be _____ suitable for use on the line side of the service equipment or equivalent. Answer 1 approved as Answer 2 identified as Answer 3 labeled Answer 4 marked

Answer 39

Answer 4 marked | 230.46

Question 40

Underground service-entrance conductors shall be protected against _____ damage. Answer 1 physical Answer 2 extensive Answer 3 severe Answer 4 impact

Answer 40

Answer 1 physical | 230.50(A)

Question 41

Service-entrance cables which are not installed underground where subject to physical damage shall be protected by _____. Answer 1 rigid metal conduit Answer 2 IMC Answer 3 Schedule 80 PVC conduit Answer 4 any of these

Answer 41

Answer 4 any of these | 230.50(B)(1)(1), (2), and (3)

Question 42

Service heads on raceways or service-entrance cables and goosenecks in service-entrance cables shall be located _____ the point of attachment unless impracticable. Answer 1 above Answer 2 below Answer 3 even with Answer 4 any of these

Answer 42

Answer 1 above | 230.54(C)

Question 43

To prevent the entrance of _____ service-entrance conductors shall be connected to the service drop or overhead service conductors either below the level of the service head or below the level of the termination of the service-entrance cable sheath. Answer 1 rain Answer 2 snow Answer 3 ice crystals Answer 4 moisture

Answer 43

Answer 4 moisture | 230.54(F)

Question 44

Service-entrance and overhead service conductors shall be arranged so that _____ will not enter the service raceway or equipment. Answer 1 dust Answer 2 vapor Answer 3 water Answer 4 lightning

Answer 44

Answer 3 water | 230.54(G)

Question 45

On a three-phase 4-wire delta-connected service where the midpoint of one phase winding is grounded the service conductor having the higher phase voltage-to-ground shall be durably and permanently marked by an outer finish that is _____ in color or by other effective means at each termination or junction point. Answer 1 orange Answer 2 red Answer 3 blue Answer 4 any of these

Answer 45

Answer 1 orange | 230.56

Question 46

Barriers shall be placed in service equipment such that no uninsulated ungrounded service busbar or service _____ is exposed to inadvertent contact by persons or maintenance equipment while servicing load terminations with the service disconnect in the open position. Answer 1 phase conductor Answer 2 neutral conductor Answer 3 terminal Answer 4 disconnect

Answer 46

Answer 3 terminal | 230.62(C)

Question 47

The service disconnecting means shall be marked to identify it as being suitable for use as service equipment and shall be _____. Answer 1 weatherproof Answer 2 listed or field evaluated Answer 3 approved Answer 4 moisture resistant

Answer 47

Answer 2 listed or field evaluated | 230.66(A)

Question 48

Where the service equipment for areas of nursing homes and limited care facilities used exclusively as _____ is replaced a surge-protective device (SPD) shall be installed. Answer 1 patient sleeping rooms Answer 2 critical care areas Answer 3 public areas Answer 4 emergency egress

Answer 48

Answer 1 patient sleeping rooms | 230.67(A)(4) and 230.67(D)

Question 49

SPD's required by 230.67(A) shall be an integral part of the service equipment or shall be located _____. Answer 1 immediately adjacent thereto Answer 2 within 3 ft of the service equipment Answer 3 within 10 ft of the service equipment Answer 4 within sight of the service equipment

Answer 49

Answer 1 immediately adjacent thereto | 230.67(B)

Question 50

The surge-protective device (SPD) required for a dwelling unit shall be _____. Answer 1 Type 1 or 2 Answer 2 Type 2 or 3 Answer 3 Type 3 Answer 4 Type 4

Answer 50

Answer 1 Type 1 or 2 | 230.67(C)

Question 51

A service disconnecting means shall be installed at a(an) _____ location. Answer 1 dry Answer 2 readily accessible Answer 3 outdoor Answer 4 indoor

Answer 51

Answer 2 readily accessible | 230.70(A)(1)

Question 52

A service disconnecting means shall not be installed in _____. Answer 1 bathrooms Answer 2 hallways Answer 3 outside Answer 4 electrical rooms

Answer 52

Answer 1 bathrooms | 230.70(A)(2)

Question 53

The additional service disconnecting means for fire pumps emergency systems legally required standby or optional standby services shall be installed remote from the one to six service disconnecting means for normal service to minimize the possibility of _____ interruption of supply. Answer 1 intentional Answer 2 accidental Answer 3 simultaneous Answer 4 prolonged

Answer 53

Answer 3 simultaneous | 230.72(B)

Question 54

For installations consisting of not more than two 2-wire branch circuits the service disconnecting means shall have a rating of not less than _____. Answer 1 15A Answer 2 20A Answer 3 25A Answer 4 30A

Answer 54

Answer 4 30A | 230.79(B)

Question 55

_____ are permitted to be connected to the supply side of the service disconnecting means. Answer 1 Cable limiters Answer 2 Meter sockets Answer 3 Solar PV systems Answer 4 all of these

Answer 55

Answer 4 all of these | 230.82(1), (2), and (6)

Question 56

A meter-mounted transfer switch shall be listed and be capable of transferring _____. Answer 1 the load served Answer 2 125 percent of the continuous load served Answer 3 the maximum short-circuit current Answer 4 all of these

Answer 56

Answer 1 the load served | 230.82(11)

Question 57

For one- and two-family dwelling unit service conductors an emergency disconnecting means shall be installed in a readily accessible _____ location. Answer 1 indoor Answer 2 outdoor Answer 3 indoor or outdoor Answer 4 enclosed

Answer 57

Answer 2 outdoor | 230.85(A)(1)

Question 58

The markings for the required emergency disconnecting means for one- and two-family dwelling services shall _____. Answer 1 be permanently affixed and be sufficiently durable to withstand the environment involved Answer 2 be located on the outside front of the disconnect enclosure with red background and white text Answer 3 have lettering at least 1⁄2 in. high Answer 4 all of these

Answer 58

Answer 4 all of these | 230.85(E)(2)(1), (2), and 110.21(B)(2)

Question 59

Each _____ service conductor shall have overload protection. Answer 1 overhead Answer 2 underground Answer 3 ungrounded Answer 4 individual

Answer 59

Answer 3 ungrounded | 230.90

Question 60

Ground-fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150V to ground but not exceeding 1000V phase-to-phase for each service disconnecting means rated _____ or more. Answer 1 1000A Answer 2 1500A Answer 3 2000A Answer 4 2500A

Answer 60

Answer 1 1000A | 230.95