NEC Code Questions Practice Test17
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Question 1 of 10
1. Question
1 pointsWhat is the minimum working space that should be provided for switch boards and panel boards?
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Refer : NEC 110.26(A)(3)
There should be alteast 6 1/2 feet working clearance space above the switch boards or panel boards.

Question 2 of 10
2. Question
1 pointsWhich of the following equation is suitable to find the voltage drop in the circuit?
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Voltage drop in the circuit = current flow in the circuit * resistance of the circuit
VD = I * R

Question 3 of 10
3. Question
1 pointsWhat is the wattage of the 120 volts single phase motor with a resistance of 20 ohms?
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Wattage P = V I
P = V^{2} / R
P = (120 * 120 ) / 20 = 720 Watts

Question 4 of 10
4. Question
1 pointsOver current devices must not be located on …………..
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Question 5 of 10
5. Question
1 pointsThe primary current rating of a motor generator arc welder is 30 A with a duty cycle of 30 %? what is the minimum size branch circuit conductor for welder?
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Question 6 of 10
6. Question
1 pointsThe maximum over current protection used for resistance type heating elements in electric spaceheating equipment?
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Refer : NEC 424.22(B)

Question 7 of 10
7. Question
1 pointsFor a single family dwelling unit , what is the minimum allowable rating of a 3 wire service entrance conductors?
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Refer : NEC 230.42(B)
Ungrounded conductors for specific installations not to be less than service disconnecting means.
Refer : NEC 230.79(C)
Disconnecting means for a single family dwelling unit must not be less than 100 Amperes

Question 8 of 10
8. Question
1 pointsAn electric heater with a resistance of 18 ohms which draws a current of 7 amps. what is the minimum wattage of electric heater?
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power P = I ^{2} * R
= 7^{2} * 18 = 49 * 18 = 882 watts.

Question 9 of 10
9. Question
1 pointsWhat is the maximum branch circuit load for a 10 kW single electric range in a dwelling unit?
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Refer: NEC Table 220.555
For an electric range not over 12 KW the maximum branch circuit load is 8 kW

Question 10 of 10
10. Question
1 pointsWhich of the following must be provided near electronic equipment which are exposed to physical damage?
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Refer : NEC 110.27(B)