NEC 2020 Code Questions Practice Test 10

Question 1: What is the smallest aluminium size wire that can be used as service entrance conductors?

• 8 AWG
• 6 AWG
• 10 AWG
• 12 AWG

NEC Reference: NEC 230.31(B)

Question 2: What should be electrical fuse size to protect 10 AWG conductor?

• 30 amperes
• 20 amperes
• 15 amperes
• 25 amperes

NEC Reference: NEC 240.4

Question 3: For equipment's installed in class I location, which of the following type of bonding is required?

• A bonding jumper
• Double ended jumper
• Hardly bonded
• compression type bonding

NEC Reference: NEC 501.30

Question 4: A 230 volts source is connected 240 volts source. what is the minimum NEC recommended voltage for that load?

• 228 volts
• 230 volts
• 225 volts
• 240 volts

Question 5: What is the calculated load for 3 work stations which has 5 feet multi outlets not simultaneously used and 2feet multi outlets which are used simultaneously?

• 1.62 KVA
• 3.6 KVA
• 1.86 KVA
• 2.96 KVA

NEC Reference: NEC 220.14(H)

Question 6: What is the minimum operating rating of short circuit ground fault protective device that can be used for individual motor-compressor?

• 10 A
• 15 A
• 20 A
• 25 A

NEC Reference: NEC 440.22(A)

Question 7: What is the minimum tap conductor ampacity which supply 30 A industrial heating appliances?

• 10 amperes
• 20 amperes
• 15 amperes
• 18 amperes

NEC Reference: NEC 210.19(A)(4)

Question 8: In a single family dwelling unit what is the minimum allowable rating of a 3 wire service conductors?

• 125 amperes
• 100 amperes
• 150 amperes
• 75 amperes

NEC Reference: NEC 230.42(C)

Question 9: one 6 AWG THHN conductor is good for how many KW at 240 volts?

• 15.6 KW
• 7.8 KW
• 12.5 KW
• 6.5 KW

NEC Reference: NEC 310.15(B)(16)

Question 10: All 125 volt, 15 and 20 ampere receptacles installed in dwelling unit bathrooms require:

• GFCI protection
• AFCI protection only
• No special protection
• A metal cover plate only

NEC Reference: NEC 210.8(A)(1)

Question 11: Central heating equipment other than fixed electric space-heating equipment must be supplied by:

• An individual branch circuit
• The kitchen small-appliance circuit
• Any general-purpose lighting circuit
• A shared circuit with the water heater

NEC Reference: NEC 210.11(C)(4)

Question 12: Conductors for outside branch circuits and feeders must generally be:

• Insulated or covered
• Always bare with no exceptions
• Painted for identification only
• It does not matter

NEC Reference: NEC 225.4

Question 13: As a general rule, each service drop or lateral must supply:

• Only one set of service-entrance conductors
• An unlimited number of sets
• Exactly four sets, always
• No conductors, only raceways

NEC Reference: NEC 230.40

Question 14: As a general rule, overcurrent protection must be provided at the point where a conductor:

• Receives its supply
• Terminates at the last outlet, always
• Crosses a property line
• There is no general rule

NEC Reference: NEC 240.21

Question 15: On the load side of the service disconnecting means, a grounded circuit conductor must not be connected to:

• Normally non-current-carrying metal parts
• The ungrounded conductor only
• The service disconnect only
• This connection is always required downstream

NEC Reference: NEC 250.24(A)(5)

Question 16: On the load side of the service disconnecting means, the grounded circuit conductor is generally permitted to be used to ground non-current-carrying metal parts of equipment when?

• Only under narrow, specifically listed exceptions
• Always, with no restriction
• Never, under any circumstance including the service
• Only for lighting circuits

NEC Reference: NEC 250.142(B)

Question 17: All conductors of the same circuit, including the grounded conductor and equipment grounding conductor if any, must generally be:

• Grouped together in the same raceway or cable
• Run in separate raceways for safety
• It does not matter how they are grouped
• Separated by at least 6 inches always

NEC Reference: NEC 300.3(B)

Question 18: For an angle pull, the distance between each raceway entry and the opposite wall of the box must be not less than how many times the trade diameter of the largest raceway in that row?

• 4 times
• 6 times
• 8 times
• 10 times

NEC Reference: NEC 314.28(A)(2)

Question 19: Exposed runs of NM cable must be protected from physical damage, and where run at angles with joists, must:

• Be protected from physical damage
• Never be installed at an angle
• Have no requirements at all
• Be spliced at every joist

NEC Reference: NEC 334.15

Question 20: Rigid metal conduit (RMC) must generally be securely fastened within 3 feet of each box or fitting, and supported at intervals not exceeding:

• 5 feet
• 10 feet
• 15 feet
• 20 feet

NEC Reference: NEC 344.30

Question 21: In dwelling units, at least one wall switch-controlled lighting outlet must be installed in every:

• Habitable room and bathroom
• Attic only
• Nowhere is this required
• Only the kitchen

NEC Reference: NEC 210.70(A)(1)

Question 22: Where no grounding means exists at an outlet box, a non-grounding-type receptacle may be replaced with a GFCI receptacle marked:

• "No Equipment Ground"
• "Fully Grounded"
• No marking is required
• "GFCI Not Required"

NEC Reference: NEC 406.4(D)(2)

Question 23: Lighting track is prohibited from being installed in which of the following locations?

• Clothes closets
• Living rooms
• Kitchens
• Hallways

NEC Reference: NEC 410.16(C)

Question 24: A built-in dishwasher or trash compactor is permitted to be cord-and-plug connected with a flexible cord within what length range, measured from the front face of the appliance?

• 3 to 4 feet
• 6 to 8 inches
• 10 to 15 feet
• Any length

NEC Reference: NEC 422.16(B)(1)

Question 25: The nonheating leads of deicing and snow-melting cables and units must be:

• Suitable for the location and protected from damage
• Left exposed with no protection
• Never installed underground
• Painted red only

NEC Reference: NEC 426.23

Question 26: A motor installed in a wet location must be:

• Totally enclosed or otherwise approved for the location
• Open drip-proof only, with no restrictions
• It does not matter
• Prohibited entirely

NEC Reference: NEC 430.11

Question 27: Where equipment employing a hermetic refrigerant motor-compressor is field-assembled, and the motor-compressor is not marked with sufficient data, the field-installed nameplate must be marked with:

• Sizing data for branch circuits and protective devices
• No additional marking is ever required
• Only the manufacturer's logo
• The building permit number

NEC Reference: NEC 440.10

Question 28: Ground-fault protection of equipment (GFPE) is generally required for solidly grounded wye services of more than 150 volts to ground, but not exceeding 1000 volts phase-to-phase, for each service disconnect rated:

• 1000 amperes or more
• 100 amperes or more
• 30 amperes or more
• GFPE is never required at services

NEC Reference: NEC 230.95

Question 29: The service disconnecting means for each service permitted by 230.2, or for each set of service-entrance conductors, must consist of not more than:

• Six switches or six circuit breakers
• Two switches, always
• There is no limit
• One switch only

NEC Reference: NEC 230.71(A)

Question 30: Equipment installed in a hazardous (classified) location must be approved for the:

• Specific class, group, and properties of the hazard present
• General location only, regardless of hazard type
• Color of the building only
• No specific approval is needed

NEC Reference: NEC 500.8(A)