NEC Questions Practice Test15
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Question 1 of 10
1. Question
1 pointsWhat is the maximum voltage drop recommended by NEC for both branch conductor and feeder conductor?
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Question 2 of 10
2. Question
1 pointsThe connected load of allelectric restaurant is 140 KVA which is supplied by a 120/208 V three phase supply. What is the required service conductor ampacity?
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Total connected load = 140 KVA
Refer : NEC Table 220.88
First 200 KVA load is at 80% so
Total demand load 140 * 0.8 = 112 KVA
ampacity I = VA / [E * 1.732 ] = (112 * 10^{3} ) / (208 * 1.732)
= 311 amperes

Question 3 of 10
3. Question
1 pointsWhat size branch circuit protection is required for 20 A motor compressor connected to 240 volts single phase supply?
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Refer : NEC 440.22 (A)
The branch circuit protection ratings should be 175% of motor current rating.
branch circuit rating = 20 * 1.75 = 35 amperes

Question 4 of 10
4. Question
1 pointsA 30 ampere branch circuit with heavy duty lamp holders is permitted to supply fixed lightening units in …………………..
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Refer : NEC 210.23(B)
30 ampere branch circuit with heavy duty lamp holders is permitted to supply fixed lightening units other than dwelling unit .

Question 5 of 10
5. Question
1 pointsWhat is the minimum general lightening load required for 1500 square foot single family dwelling unit as permitted by NEC?
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Refer : NEC Table 220.12
for dwelling unit minimum general lightening load is 3 VA / square foot
Total load = 1500 * 3 = 4500 VA

Question 6 of 10
6. Question
1 pointsWhat size service conductor is required for a 120/240 volts single phase with a demand load of 48 KVA?
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Refer : I = P / E
I = 48000 / 240 = 200 amperes

Question 7 of 10
7. Question
1 pointsIn calculating the load for a commercial kitchen with one electric appliance, which of the following demand factor is allowed?
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Refer: NEC 220.56
For load calculation of a commercial kitchen with only one electric appliance should be rated at 100%. For applying deductions there must be atleast three or more appliances should be available.

Question 8 of 10
8. Question
1 pointsThe ampacity of 2/0 THHN conductor is 195 amperes ( 90^{0} C). What is the maximum allowable ampacity of 2/0 THHN conductor in a conduit with 5 other current carrying conductors?
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If more than 3 conductors are placed in a conduit the conductor ampacity must be derated.
Refer: NEC Table 310.15(B)(3)
For 5 conductors in a conduit the derating factor is 80%
maximum allowable ampacity = 0.8 * 195 = 156 amperes

Question 9 of 10
9. Question
1 pointsAn isolated ground receptacle shall be identified by :…………….
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Refer : NEC 406.3 (D)
An orange triangle located on the face of the receptacle.

Question 10 of 10
10. Question
1 pointsIf a panel board contains a snap switch with rating of 30 amperes must be protected not in excess of :
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Refer : NEC 408.36 (A)
the maximum rating of Panel boards containing 30 amperes or less snap switches should be less than 200 amperes.