NEC 2023 Code Questions Practice Test 9

Question 1: What is the maximum voltage drop that is recommended by NEC for branch conductor and feeder conductor?

• 3 %
• 5 %
• 8 %
• 4 %

NEC Reference: NEC 210.19(A) / 215.2(A) Informational Notes

Question 2: What is the minimum load that is required for exterior sign or outline lightening for a commercial occupancy as per NEC?

• 12000 VA
• 18000 VA
• 15000 VA
• 21000 VA

NEC Reference: NEC 220.14(F)

Question 3: A cord and plug device used as disconnecting means for a motor must be rated for ..................

• Horsepower
• voltage
• Resistance
• Current

NEC Reference: NEC 430.109(F)

Question 4: A 2400 volts motor disconnecting means must be capable of being locked in the .....................

• closed position
• Open position
• ON position
• Both open and close position

NEC Reference: NEC 430.227

Question 5: If the branch circuit rating more than ................., the lamp holders connected to it should be of the heavy duty type.

• 20 amperes
• 25 amperes
• 40 amperes
• 45 amperes

NEC Reference: NEC 210.21(A)

Question 6: All 15 or 20 amperes receptacle outlets installed in bathrooms of dwelling units must always require .............................

• Non ground recetacles
• water proof receptacles
• protective gaurds
• Ground fault circuit interceptor ( GFCI)

NEC Reference: NEC 210.8(A)(1)

Question 7: How much power consumed by 240 volts circuit that draws 30 amperes current?

• 7.2 KW
• 5.2 KW
• 8.5 KW
• 9.3 KW

Question 8: For conductors supplying portable signs in a dry location what is the maximum length in feet allowed?

• 16
• 12
• 15
• 8

NEC Reference: NEC 600.10(D)(2)

Question 9: For a commercial kitchen with two electrical equipment, what demand factor is allowed?

• 100 %
• 80 %
• 70 %
• 90 %

NEC Reference: NEC 220.56

Question 10: Where the grounding electrode conductor connects only to a rod, pipe, or plate electrode (or a combination of these), the conductor is not required to be larger than:

• 6 AWG copper
• 2/0 AWG copper
• 14 AWG copper
• There is no maximum size cap

NEC Reference: NEC 250.66(A)

Question 11: A one-family dwelling must have at least one receptacle outlet accessible at grade level installed:

• At both the front and back of the dwelling
• Only inside the garage
• Nowhere outdoors, it is not required
• Only on the roof

NEC Reference: NEC 210.52(E)(1)

Question 12: Under the small conductor rule, 12 AWG copper conductors are limited to a maximum standard overcurrent device rating of:

• 20 amperes
• 15 amperes
• 30 amperes
• 40 amperes

NEC Reference: NEC 240.4(D)(5)

Question 13: Metal piping systems (other than gas piping), such as ductwork, that may become energized must be bonded per:

• The service equipment or grounding electrode system
• It is never bonded
• Only to a nearby tree root system
• To the telephone company only

NEC Reference: NEC 250.104(C)

Question 14: Boxes and conduit bodies must be installed so that the wiring contained in them can be rendered accessible without:

• Removing part of the building structure or finish
• This is never a requirement
• Demolishing the entire wall
• It does not matter if boxes are ever accessible

NEC Reference: NEC 314.29

Question 15: Threadless couplings and connectors used with rigid metal conduit must be:

• Made up tight, and listed for wet locations where applicable
• Left loose for thermal expansion
• Never permitted on RMC
• Made of plastic only

NEC Reference: NEC 344.42

Question 16: A portable handlamp must be equipped with a flexible cord of the hard-usage or extra-hard-usage type, and:

• A substantial guard around the lamp
• No guard is ever required
• A lightweight paper shade only
• A second, unused cord

NEC Reference: NEC 410.62(C)

Question 17: A cord-and-plug-connected electric drinking fountain must be provided with:

• GFCI protection
• No protection is required
• AFCI protection only
• A dedicated 50 ampere circuit only

NEC Reference: NEC 422.52

Question 18: Motors must be located so that adequate ventilation is provided, and so that maintenance, such as lubrication and replacement, can be:

• Readily accomplished
• Never performed under any condition
• It has no bearing on motor location
• Performed only by the manufacturer, on-site is prohibited

NEC Reference: NEC 430.14(A)

Question 19: A power conversion equipment (adjustable-speed drive) system must provide motor overload protection in one of two ways: by a separate overload device, or by:

• An integrated overload protection system meeting listed criteria
• No overload protection is required with a drive
• A padlock on the drive enclosure
• The drive's power cord alone

NEC Reference: NEC 430.126

Question 20: A dry-type transformer installed outdoors must have a:

• Weatherproof enclosure
• Open frame with no enclosure
• Wooden crate
• It does not require any enclosure outdoors

NEC Reference: NEC 450.22

Question 21: Attachment plugs and receptacles in a Class I, Division 2 location must be designed so that connection or disconnection under load:

• Does not expose live parts, unless listed for the location
• Is always permitted with no restriction
• Is prohibited entirely, with no exceptions
• Has no bearing on hazardous location safety

NEC Reference: NEC 501.105(B)(2)

Question 22: Switches, circuit breakers, and motor controllers with contacts that may produce arcs, installed in a Class II, Division 1 location, must be provided with enclosures that are:

• Dust-ignitionproof
• Standard indoor plastic enclosures
• Open, with no enclosure at all
• Cardboard, for cost savings

NEC Reference: NEC 502.115(A)

Question 23: In a mobile or manufactured home, GFCI protection is required for 125 volt, 15 and 20 ampere receptacles in which locations, similar to a dwelling unit?

• Bathrooms, kitchens, and outdoors
• Nowhere, mobile homes are exempt
• Only the living room
• Only the master bedroom

NEC Reference: NEC 550.25

Question 24: The "electrical datum plane" concept at marinas and boatyards is used to determine the minimum elevation above high water for the mounting height of:

• Electrical equipment
• Boat hull paint
• Nothing electrical, only dock decking
• Fish feeding stations

NEC Reference: NEC 555.19

Question 25: The disconnecting means for elevator, escalator, or moving walk equipment must be legibly marked to indicate:

• The equipment it controls
• The installer's favorite color
• Nothing, marking is optional
• The building's square footage

NEC Reference: NEC 620.51(D)

Question 26: Automatic transfer switches for emergency systems must be designed and installed to prevent the inadvertent interconnection of:

• Normal and alternate power sources
• Two lighting circuits only
• It has no such purpose
• Telephone and data circuits only

NEC Reference: NEC 700.6

Question 27: Products listed by a qualified testing laboratory are generally considered to comply with the NEC as-is, and further field inspection of internal wiring is not usually required, per:

• NEC 90.7
• NEC 90.1
• NEC 300.1
• No such provision exists

NEC Reference: NEC 90.7

Question 28: Each disconnecting means must be legibly marked to indicate its purpose, unless:

• The purpose is evident by the physical arrangement
• Marking is never required, regardless of context
• It is always required, with no exceptions ever
• Marking is optional at the installer's convenience

NEC Reference: NEC 110.22(A)

Question 29: Where circuit breakers are applied in a tested series combination rating (higher than the individual interrupting rating alone), the equipment enclosure must be legibly marked to indicate:

• The series combination rating used
• Nothing, marking is never required
• Only the installer's name
• The building's square footage

NEC Reference: NEC 240.86(C)

Question 30: Normally non-current-carrying conductive materials enclosing electrical conductors must be connected together and to the supply source in a manner that establishes an effective path for fault current, which is intended to:

• Facilitate overcurrent device operation and limit voltage on equipment
• Increase the resistance of the circuit intentionally
• It has no protective purpose
• Only improve the appearance of the installation

NEC Reference: NEC 250.4(A)(3)