NEC Code Questions Practice Test-19
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Question 1 of 9
1. Question
1 pointsWhat is the maximum 3 phase load that can be connected on a 220 ft 8 THWN , 480 volts conductor without exceeding the NEC recommended voltage drop?
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NEC recommended voltage drop is 3% for branch conductors
Voltage Drop = 480 * 0.03 = 14.4 volts
VD = 1.732 * I * K * D / CM
Where D = 220 feet
K=12.9
VD = 14.4
CM = 16510 ( 8 THWN)
I = (VD * CM ) / (1.732 * K * D)
= (14.4 * 16510) / (1.732 * 12.9 * 200)
= 48.36 amperes
P = 1.732 * V * I = 1.732 * 480 *48.36 = 40.2 KVA
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Question 2 of 9
2. Question
1 pointsWhat is the minimum general lighting load required for a 1500 square feet ware house as permitted by NEC?
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Minimum general lightening load = 0.25 VA/ square feet
Total lightening load = 1500 * 0.25 = 375 VA
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Question 3 of 9
3. Question
1 pointsA 240 volts single phase room air-conditioner rating not more than …………. can be consider as a single motor unit?
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Refer : NEC 440.62(A)(2)
Air conditioner with a rating less than 40 amperes , 250 volts can be consider as single phase motor unit.
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Question 4 of 9
4. Question
1 pointsIf a replacement motor compressor draws 48 amperes , what s the minimum rating of disconnect means?
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Refer : NEC 440.12(A)(1)
40 * 1.15 = 46 amperes
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Question 5 of 9
5. Question
1 pointsThe single phase switches can be used to control the motors when they are rated at ……… horse power or less.
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Question 6 of 9
6. Question
1 pointsWhat should be the maximum percentage cross sectional area of a conduit that should be occupied when three or more THW conductors are placed in a conduit?
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Refer : Chapter 9 Table 1
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Question 7 of 9
7. Question
1 pointsWhat is the resistance offered by electric heater rated 1800 watts at 120 volts?
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Power P = V2 / R
R = V2 / P
= ( 120 * 120 ) / 1800
= 8 ohms
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Question 8 of 9
8. Question
1 pointsIntrinsically safe conductors are identified by …………..
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Refer : NEC 504.80(C)
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Question 9 of 9
9. Question
1 pointsWhich of the following is the smallest conductor permitted for pool equipment is :
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Refer: NEC 680.26(B)