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IEC YEAR 1 FINAL EXAM STUDY 2024 WITH 100% CORRECT ANSWERS LATEST UPDATE
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What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads? Select one: a. The load of higher resistance would overheat and probably be damaged. b. The load of lesser resistance would overheat and probably be damaged. c. No effect until one load is turned off or...

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  • August 29, 2024
  • 47
  • 2024/2025
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  • iec year 1 final exam study 2024

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IEC Final Exam Year 1.pdf file:///C:/Users/HP/Desktop/pppppp/IEC%20Final%20Exam%20Year




IEC Final Exam Year 1


1. What is the result if the neutral wire becomes open on a multiwire circuithaving

unequal loads?

a.

The load of higher resistance would overheat and probably be damaged.b.

The load of lesser resistance would overheat and probably be damaged.c.

No effect until one load is turned off or opens.d.

No effect.

ANS a.

The load of higher resistance would overheat and probably be damaged.

2. Circuits 7 and 9 share a neutral.This is a multiwire branch circuit. If Ckt. 7 isdrawing 13

amps and Ckt. 9 is drawing 16 amps, how much current is flowingin the neutral?



a.3

b.13

c.29





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,IEC Final Exam Year 1.pdf file:///C:/Users/HP/Desktop/pppppp/IEC%20Final%20Exam%20Year




d.16

ANS 3 Amps

3. The Code reference that specifies the type of disconnecting means (circuitbreaker for

example) that can be used on a multiwire branch circuit that feedsdevices mounted on the

same yoke [a stack switch or a duplex receptacle for example] is .Note

Select N/A (not applicable) if there is not an NEC requirement.



a.Article 100

b.240.15(B)(1)

c.404.8(A)

d.N/A

ANS b. 240.15(B)(1)

4. Voltmeters are connected in with the load when used to measure voltageacross a load in

a circuit.

ANS Parallel

5. The neutral has been removed from the neutral bar in the circuit shown in Figure

128.407. Lamp 3 is connected in with Lamps 1 and 2.

ANS Series





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(3 wire parallel circuits turn to series when the neutral is disconnected from theneutral

bar)

6. What is the minimum number of receptacles required in an unfinishedbasement?



a.2









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,IEC Final Exam Year 1.pdf file:///C:/Users/HP/Desktop/pppppp/IEC%20Final%20Exam%20Year




b.4

c.1

d.0

ANS c. 1

7. The overall diameter (including insulation) of a 250 kcmil THHN/THWN cop-per

conductor is inches?



a..082

b..397

c..765

d..711 e..575

ANS d. 711



NEC Chapter 9 Table 5 pg 701

8. What part of the NEC is a reference for calculating conduit fill where allconductors

are the same size?



a.Article 100





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