Flexible Cords and Fixture Wires ( NEC 450) Practice Test
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Free online practice test on Flexible cords and Fixture Wires (NEC CODE 450) Objective Questions.
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Question 1 of 8
1. Question1 points
Flexible cord or cable cannot be used in place of permanent wiring.Correct
Question 2 of 8
2. Question1 points
When eight 16A current carrying conductors are grouped in to a flexible cord. What is the allowable ampacity of each conductor?Correct
Refer : NEC Table 400.5(A)(3).
For 7-9 conductors the adjustment factor is 70%
So allowable ampacity = 16 * 0.7 = 11.2 amperes
Question 3 of 8
3. Question1 points
Which of the following places the flexible cords cannot be used?Correct
Question 4 of 8
4. Question1 points
The over current devices for flexible cords or cables must not be rated …………………………..Correct
Question 5 of 8
5. Question1 points
Which of the following is the minimum size of fixture size that can use for wiring control circuits?Correct
Refer NEC 402.6
Question 6 of 8
6. Question1 points
What is the allowable ampacity of a 10 AWG Fixture wire?Correct
Refer NEC Table 402.5
Question 7 of 8
7. Question1 points
Unless it is permitted the conductors cannot be used for the following wiring?Correct
Question 8 of 8
8. Question1 points
When 5 current carrying conductors are equipped in the flexible cord, which percentage of rated ampacity is allowed for each conductor?Correct
Refer: NEC Table 400.5(A)(3).
Allowable percentage for 4-6 conductors is 80%