NEC Code Questions Practice Test-8
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Free NEC Code Questions Practice Quiz-8
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Question 1 of 10
1. Question
1 pointsWhat is the minimum fixture wire size that shall be permitted?
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Refer: NEC 402.6 ( Fixture wires shall not be smaller than 18 AWG)
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Question 2 of 10
2. Question
1 pointsWhat size of over current protection device is required for a 24 ampere continuous load where the ambient temperature is 75 0C?
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Refer : NEC 210.20(A)
The over current device rating should be 125% of continuous load.
24 * 1.25 = 30 amperes
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Question 3 of 10
3. Question
1 pointsIn multiple parallel circuit paths, the current will always take the path of ……………
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Question 4 of 10
4. Question
1 pointsAs mentioned in NEC, a multifamily dwelling unit is the one that contains …………….
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Refer: NEC [100] Definitions
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Question 5 of 10
5. Question
1 pointsWhat size service conductors are required for a dwelling load with a calculated load is 190 A. The service disconnect breaker is rated at 200 A?
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Answer : 2/0 AWG
Note : Service conductors that supply individual dwelling unit or single dwelling unit can have ampacity rating of 83% of service disconnect.
The conductor ampacity for 200 A service disconnect = 0.83 * 200 = 166 amperes
Refer : NEC Table 310.15(B)(16)
2/0 AWG with ampacity 175 amperes ( 750 C) is suitable as service conductor
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Question 6 of 10
6. Question
1 pointsA 400 breaker protects a set of 450 kcmil feeder conductors. A feeder fed from 450 kcmil feeder that supply disconnects with 25 A over current device. What is the minimum size conductor for these tap?
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Answer : 8 AWG
The over current device 25 A is less than 10 percent of the rating of the feeder breaker (400A.) As per code it cannot be less than 40 A.
Refer : NEC Table 310.15(B)(16)
8 AWG at 40A 60 C is the minimum size required.
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Question 7 of 10
7. Question
1 pointsWhich is the minimum size copper conductor is required for the grounding electrode conductor (GEC) connected to a ground rod
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Refer : NEC [250.166(A)].
Minimum Size Grounding Electrode conductor:
8 AWG Copper
6AWG Aluminium
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Question 8 of 10
8. Question
1 pointsWhat is the maximum size over current device is required for a 4200 W, 240 V electric water heater connected in a building.
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Protection rating for an electric water heater should be less than 150% of the rating of device.
Protection size = 4200 / 240 * 1.5
Protections size = 26.25 A
The nearest next size over current device is 30 A.
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Question 9 of 10
9. Question
1 pointsWhat is the maximum allowable conductor fill for 4in * 4 in wireway?
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Wireway Area = 4 in. * 4 in. = 16 sq. in.
Refer : NEC 376.22(A)
The conductor fill area should be maximum 20 % of the total wireway area.
Wireway conductor fill = 16 * 0.2 = 3.2 sq. in.
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Question 10 of 10
10. Question
1 pointsHow many 10 AWG RHH conductors can be installed in trade size ¾ EMT?
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Refer NEC Annex C Table C.1
Total 6 10 AWG RHH conductors can be installed in trade size ¾ EMT.