Single Family Dwelling Practice Questions 1 (NEC Code)
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NEC Code Questions : Single family dwelling unit calculations
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Question 1 of 9
1. Question
1 pointsWhat is the minimum feeder or service load for cloth dryers in a dwelling unit?
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Refer: NEC 220.54

Question 2 of 9
2. Question
1 pointsIf a single family unit consists of one air conditioner rated at 3 kW and fixed heating equipment rated at 2.5 kw? What is the total dwelling calculated load for both?
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Refer: NEC 220.60
Because both will not operate simultaneously, the smaller of the two loads can be omitted.
Total calculated load will be 3 kW

Question 3 of 9
3. Question
1 pointsService conductors supplying the entire one dwelling unit load can have an ampacity of ………….. percentage the service rating.
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Refer: NEC 310.15(B)(7)

Question 4 of 9
4. Question
1 pointsAs per NEC what is the minimum general lighting load that is used for branch circuit and feeder/Service calculations of a single family dwelling unit?
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Refer: NEC 220.12

Question 5 of 9
5. Question
1 pointsIn a single family dwelling unit when four or more appliances are fastened in a place and connected to the same feeder then ………………….. percentage demand can be applied in calculating total demand load.
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Question 6 of 9
6. Question
1 pointsWhat is the minimum general lightening load required for 1500 square foot single family house as permissible by NEC?
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For a dwelling unit minimum general lightening load is 3 VA / Square foot
Total load = 1500 * 3 = 4500 VA

Question 7 of 9
7. Question
1 pointsWhich of the following lamp holders are used in 15 ampere branch circuit that is used to supply fixed lightening units in dwelling unit?
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Question 8 of 9
8. Question
1 pointsAll 15 or 20 ampere receptacle outlets installed in bathrooms of dwelling unit must always require ………………………
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Refer :
NEC 210.8(A)(1)

Question 9 of 9
9. Question
1 pointsfor single family dwelling unit what is the minimum allowable rating of a 3 wire service entrance conductor?
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Refer: NEC 230.42 (B)
un grounded service conductors for a specific installations not to be less than service disconnecting means
Refer : NEC 230.79 (C)
disconnecting means for single family dwelling unit must not be less than 100 Amperes