Iowa Electrician Exam 5

Question 1 of 25

1. Question

What is the approximate thickness of the insulation of a 10 AWG, THW conductor?

0.76 mils

1.14 mils

30 mils

45 mils

Question 2 of 25

2. Question

Underwater luminaires, mounted in walls of swimming pools, shall be installed with the top of the luminaire lens not less than ___________ below the normal water level of the pool, unless the luminaire is listed and identified for use at lesser depths.

12 in.

18 in.

20 in.

24 in.

Question 3 of 25

3. Question

What is the maximum number of 1/0 AWG, RHW conductors allowed in a section of 2 in. ENT that is 24 in. long?

5

6

8

9

Question 4 of 25

4. Question

Separable connections, such as those provided in drawout equipment, shall provide for _____________ of the equipment grounding conductor.

first-make, last-break

last-break, first-make

continuity

isolation

Question 5 of 25

5. Question

Which of the following would be allowed within the dedicated equipment space that extends from the floor to a height of 6 ft. above the electrical equipment or the structural ceiling, whichever is lower?

Leak protection apparatus

Suspended ceiling with removable panels

Sprinkler piping

All of the above

Question 6 of 25

6. Question

The presence of electrically heated pipelines shall be evident by the posting of appropriate caution signs or markings at intervals not exceeding _________ along the pipeline.

5 ft.

10 ft.

15 ft.

20 ft.

Question 7 of 25

7. Question

An RV park is supplied with a 3-phase, 208Y/120 volt electrical service and equipped with the following sites. What is the minimum calculated service size for this facility?
20 sites equipped with 50 ampere, 125/250 volt receptacles
70 sites equipped with both 20 ampere and 30 ampere, 125 volt receptacles
10 sites equipped with 20 ampere, 125 volt receptacles and dedicated as tent sites

600 amperes

800 amperes

1,000 amperes

1,600 amperes

Question 8 of 25

8. Question

Insulation for underground service conductors shall have a voltage rating not less than ____________.

1,000 volts

600 volts

300 volts

the applied voltage

Question 9 of 25

9. Question

Which of the following enclosure types, for outdoor use, provides a degree of protection from corrosive agents?

Enclosure Type 3

Enclosure Type 3R

Enclosure Type 3S

Enclosure Type 3X

Question 10 of 25

10. Question

What minimum vertical clearance is required for overhead service conductors, operating at 240 volts between conductors, that pass over a roof that has a slope of 4 in. in 12 in. or greater?

10 ft.

8 ft.

3 ft.

18 in.

Question 11 of 25

11. Question

Flexible metallic tubing may be used as an equipment grounding conductor for circuits rated not over 20 amperes if the total length of the tubing does not exceed _______________.

3 ft.

4 ft.

6 ft.

8 ft.

Question 12 of 25

12. Question

A receptacle outlet shall be located on the underside of a mobile home within __________ of the cold water inlet.

1 ft.

2 ft.

3 ft.

There is no requirement for such an outlet.

Question 13 of 25

13. Question

How many 3-way switches are required to switch a light in 3 locations?

2

3

4

5

Question 14 of 25

14. Question

An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than ______________ in size.

48 in.³

64 in.³

75 in.³

100 in.³

Question 15 of 25

15. Question

For equipment rated ____________ and over 6 ft. wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance at each end of the working space.

800 amperes or more

over 800 amperes

1,200 amperes or more

over 1,200 amperes

Question 16 of 25

16. Question

Where PVC conduit is used to extend from the forming shell of underwater speakers, in a permanently installed swimming pool, to a listed junction box, a(n) ____________ copper bonding jumper shall be installed in the conduit.

8 AWG

6 AWG

4 AWG

2 AWG

Question 17 of 25

17. Question

What maximum size conductors are allowed in UF cable?

2 AWG

1/0 AWG

4/0 AWG

250 kcmil

Question 18 of 25

18. Question

A 2 in. schedule 80, PVC conduit contains 3 – 2/0 AWG, THWN conductors and 1 – 6 AWG, THHN conductor. What percentage filled is this conduit?

15 – 20%

20 – 25%

25 – 30%

30 – 35%

Question 19 of 25

19. Question

The secondary short-circuit current rating of transformers used for electric discharge lighting systems shall not exceed ____________ if the open-circuit voltage is over 7,500 volts.

150 mA

300 mA

450 mA

600 mA

Question 20 of 25

20. Question

Interior metal water piping located more than _________ from the point of entrance to a building shall not be used as a conductor to interconnect electrodes that are part of the grounding electrode system.

20 ft.

10 ft.

5 ft.

3 ft.

Question 21 of 25

21. Question

In which of the following areas of a dwelling unit would a receptacle controlled by a wall switch not be permitted in lieu of a lighting outlet?

Living room

Bedroom

Kitchen

Office

Question 22 of 25

22. Question

Capacitors containing more than __________ of flammable liquid shall be enclosed in vaults or outdoor fenced enclosures.

9 gallons

7 gallons

5 gallons

3 gallons

Question 23 of 25

23. Question

Outlet boxes without enclose devices or utilization equipment shall have a minimum internal depth of ____________.

½ in.

¾ in.

1 in.

1 ½ in.

Question 24 of 25

24. Question

When a generator set driven by a prime mover is used as back-up power supply for an emergency system and an internal combustion engine is used as the prime mover, an on-site fuel supply shall be provided with an on-premises fuel supply sufficient for not less than ___________ full-demand operation of the system.

1 hours’

2 hours’

3 hours’

4 hours’

Question 25 of 25

25. Question

Which of the following statements is/are true regarding parallel conductors?
I. The conductors must be the same size in circular mil area
II. The conductors must be larger than 3/0 AWG

I only

II only

Both I and II

Neither I nor II