Understanding NEC Article 230 Flashcards
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 service drops or service laterals
90.2(D)(5)(a)
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 service point
100 Service Drop
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 2 service lateral
100 Service Lateral
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 2 service point
100 Service Point
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 3 125 percent
215.2(A)(1)
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 2 100 percent
215.2(A)(1) Ex 3
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 3 230
230.1
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 2 special permission
230.2(C)(3)
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 2 different rate schedules
230.2(D)
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 1 one service
230.2(E)
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 2 pass through the interior of
230.3
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 1 2 in.
230.6(1)
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 4 all of these
230.7
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 1 raceway
230.8
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 1 3 ft
230.9(A)
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 1 3 ft
230.9(B)
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 1 entrance to
230.9(C)
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 2 trees
230.10
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 4 sufficient ampacity to carry the load and adequate mechanical strength
230.23(A)
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 2 8 AWG 6 AWG
230.23(B)
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 4 8 ft 6 in.
230.24(A)
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 1 3 ft
230.24(A) Ex 2
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 2 18 in.
230.24(A) Ex 3
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 2 the side of a building
230.24(A) Ex 4
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 2 10 ft
230.24(B)(1)
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 2 12 ft
230.24(B)(2)
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 4 18 ft
230.24(B)(4)
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 2 10 ft
230.26
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 1 identified
230.28(A)
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 4 sufficient ampacity for the loads calculated
230.31(A)
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 4 8 AWG
230.31(B)
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 3 12 AWG copper
230.31(B) Ex
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 2 300.5
230.32
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 1 only one
230.40
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 1 supply
230.40 Ex 5
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 2ion
Answer 3 demand
Answer 4 adjustment orion
Answer 4 adjustment orion
230.42(A)(2)
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 1 Type IGS cable
230.43(2)
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 4 all of these
230.43(3), (5), and (11)
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 4 marked
230.46
Underground service-entrance conductors shall be protected against _____ damage.
Answer 1 physical
Answer 2 extensive
Answer 3 severe
Answer 4 impact
Answer 1 physical
230.50(A)
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 4 any of these
230.50(B)(1)(1), (2), and (3)
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 1 above
230.54(C)
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 4 moisture
230.54(F)
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 3 water
230.54(G)
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 1 orange
230.56
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 3 terminal
230.62(C)
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 2 listed or field evaluated
230.66(A)
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 1 patient sleeping rooms
230.67(A)(4) and 230.67(D)
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 1 immediately adjacent thereto
230.67(B)
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 1 Type 1 or 2
230.67(C)
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 2 readily accessible
230.70(A)(1)
A service disconnecting means shall not be installed in _____.
Answer 1 bathrooms
Answer 2 hallways
Answer 3 outside
Answer 4 electrical rooms
Answer 1 bathrooms
230.70(A)(2)
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 3 simultaneous
230.72(B)
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 4 30A
230.79(B)
_____ 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 4 all of these
230.82(1), (2), and (6)
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 1 the load served
230.82(11)
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 2 outdoor
230.85(A)(1)
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 4 all of these
230.85(E)(2)(1), (2), and 110.21(B)(2)
Each _____ service conductor shall have overload protection.
Answer 1 overhead
Answer 2 underground
Answer 3 ungrounded
Answer 4 individual
Answer 3 ungrounded
230.90.D301+D401 ?
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 1 1000A
230.95
