Course Home Page ## 2008 NEC Review Practice Test 3

Course Name:2008 NEC ReviewQuiz Number:No. 3Teacher: Gerald Newton Teacher's Home Page: http://www.electrician2.com Teacher's Email: electrician@electrician2.com

No. of Questions=20

1.Given: Three (3) 500 kcmil THHN conductors in a raceway at 70 degrees F. What is the maximum allowable current in each conductor if the terminations and equipment is rated at 90 Degrees C?

a)

345 b)

380 c)

430 d)

447

2.Flexible cord may be used in all of the following locations except ______.

a)

hoists b)

cranes c)

to replace fixed wiring of a structure d)

pendants

3.When a conduit nipple having a maximum length not to exceed 24 inches is installed, the nipple shall be permitted to be filled to _____ percent of its total cross sectional area.

a)

30 b)

40 c)

50 d)

60

4.Drums of gasoline may be stored in what type of outdoor area?

a)

Anywhere b)

Class III, Division 2 c)

Class II, Division 1 d)

Unclassified areas at a bulk storage plants.

5.The interior of paint spray booths are considered ______.

a)

Class 1, or Class 2, Division 1 b)

Class 1, Division 2 c)

Class II, Division 2 d)

Class II, Division 2

6.The maximum allowable fill for conduit and tubing for 3 or more conductors, not lead covered is _______.

a)

30% b)

40% c)

50% d)

60%

7.In a conduit seal used in hazardous locations, the minimum thickness of the sealing compound, except where used in cables, should in no case be less than _______.

a)

1/4" b)

1/2" c)

5/8" d)

3/4"

8.Given: A 30 hp, 3-phase, 460 volt, continuous duty induction motor with a service factor of 1.15 and a temperature rise of 40 degrees C. The maximum rating of the required separate overload device is ______ amperes.

a)

46 b)

50 c)

56 d)

60

9.Given: Measurements for a 3-phase squirrel cage motor at full load are 460 volts and 65 amperes. Approximate the horsepower rating using the Code?

a)

30 b)

40 c)

50 d)

60

10.Refer to the figure below. Given the circuit shown. What is the current in the neutral conductor?

a)

25.0 amperes b)

12.5 amperes c)

6.25 amperes d)

4.2 amperes

11.Given: A 25 foot feeder tap. The ampacity of the tap must be at least ____ that of the feeder conductor or overcurrent protection from which it is tapped.

a)

1/4 b)

1/3 c)

1/2 d)

3/4

12.The normal current allowed on a copper bus in an Auxiliary Gutters is 1,000 amperes per square inch. The number of amperes which a 2 1/2 x 1/4 inch square copper bus may carry under these conditions is _____ amperes.

a)

625 b)

750 c)

1,000 d)

1,250

13.Given: A 240 volt conductor has a total length of 500 feet and supplies a load of 10 amperes. The conductor has a resistance of 1.45 ohms per 1,000 feet. The total voltage drop in the conductor circuit conductors is _____ percent. Select the closest answer.

a)

3 b)

5 c)

7 d)

12

14.The maximum fixture weight that may be supported by the screw shell of a lampholder is _____ pounds.

a)

2 b)

6 c)

10 d)

16

15.Where a cable is installed through bored holes in wood joists, where possible, the holes shall be bored so that the edge of the hole is not less than ______ inch(es) from the nearest edge of the wood member.

a)

1 b)

1 1/4 c)

1 1/2 d)

2

16.The minimum lighting load required for the general lighting (only) of a church building having outside dimensions of 100' by 200' is ______ volt-amperes.

a)

2,000 b)

4,000 c)

20,000 d)

40,000

17.The minimum size copper equipment grounding conduct for grounding equipment having a 40 ampere automatic overcurrent device in the circuit ahead of the equipment is No. _____.

a)

6 b)

8 c)

10 d)

12

18.Given: A 240 volt, 20 ampere two wire branch circuit. If the maximum allowable voltage drop through the circuit conductors is 2.4 volts, what is the maximum allowable resistance of the circuit conductors?

a)

12 ohms b)

1.2 ohms c)

0.48 ohms d)

0.12 ohms

19.The combined load of two, 230 volt fixed heaters on a 30 ampere 230 volt branch circuit in a dwelling occupancy shall not exceed _____ kilowatts. Select the closest answer.

a)

2.4 b)

5.5 c)

5.9 d)

24.0

20.Outlet boxes mounted in combustible walls or ceilings must be mounted so that they will be set back not more than a maximum of _____ inch from the finished surface.

a)

1/2 b)

1/4 c)

1/8 d)

0 (must be flush or project therefrom)

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