NEC Code Practice Test

Our NEC Code Practice Test is a standardized test that will prepare you for understanding the concepts of the safe installation of electrical wiring and components and help you obtain the needed license for electrical works.

We present you with 25 questions that will help you learn the National Electric Code in an easy and helpful way.

The questions cover necessary topics in this field such as wiring and protection, wiring methods, and materials. special equipment, conditions, and occupancies as well as tables with raceway and conductor specifications.

All the questions are according to the NEC 2014 Code.

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NEC Code Practice Test

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Question 1
When should underground wiring be installed in a complete raceway system?
A
if space limitations prevent 6ft of space from the pool
B
if space limitations prevent 3ft of space from the pool
C
if space limitations prevent 2ft of space from the pool
D
if space limitations prevent 5ft of space from the pool
Question 1 Explanation: 
Underground wiring should be installed in a complete raceway system if space limitations prevent 6ft of space from the pool.
Question 2
How much is the minimum lighting load for industrial commercial buildings?
A
3 volt amperes per square foot
B
2 volt amperes per square foot
C
5 volt amperes per square foot
D
6 volt amperes per square foot
Question 2 Explanation: 
The minimum lighting load for industrial commercial buildings is 2 volt amperes per square foot.
Question 3
If the cross-sectional area of the raceway is over _______, ampacity adjustment factors don’t apply to conductors installed in surface metal raceways.
A
10 sq. in
B
4 sq. in
C
8 sq, in
D
6 sq. in
Question 3 Explanation: 
If the cross-sectional area of the raceway is over 4 sq. in, ampacity adjustment factors don’t apply to conductors installed in surface metal raceways.
Question 4
What paddle fans should be supported independently?
A
Paddles of 100 Ibs
B
Paddles of 120 Ibs
C
Paddles of 70 Ibs
D
Paddles of 50 Ibs
Question 4 Explanation: 
Paddles of 70 Ibs should be supported independently from the box.
Question 5
How long should a full demand operation of the system of an onsite fuel supply must be if internal combustion engines are used as the prime mover?
A
1 hour
B
3 hours
C
2 hours
D
5 hours
Question 5 Explanation: 
A full demand operation of the system of an onsite fuel supply must be 2 hours if internal combustion engines are used as the prime mover.
Question 6
Please mark the term that describes the conductors between the service equipment, a separately derived system, or other power supply and the final branch-circuit overcurrent device:
A
Branch circuit
B
Service drop
C
Feeder
D
Service conductor
Question 6 Explanation: 
Feeder is a separately derived system or other power supply and the final branch-circuit overcurrent device.
Question 7
What should the maximum length of a flexible cord be for in-sink waste disposal?
A
2.5 ft
B
4 ft
C
6 ft
D
3 ft
Question 7 Explanation: 
The maximum length of a flexible cord for in-sink waste disposal should be 3 ft.
Question 8
Please mark the amount of A that shouldn't be exceeded by the overcurrent protection device of non-motor appliances of there is no marking of the rating of an overcurrent device:
A
30 A
B
15 A
C
20 A
D
25 A
Question 8 Explanation: 
20 A is the amount that shouldn't be exceeded by the overcurrent protection device of non-motor appliances of there is no marking of the rating of an overcurrent device.
Question 9
Please mark the number of inches that must separate power-limited fire alarm circuit conductors from insulated conductors of electric light and power:
A
6 in.
B
4 in.
C
3 in.
D
2 in.
Question 9 Explanation: 
2 in. is the number of inches that must separate power-limited fire alarm circuit conductors from insulated conductors of electric light and power.
Question 10
What is a continuous load?
A
Load where the maximum current is expected to exist for at least 3 hours
B
Load where the maximum current is expected to exist for at least 2 hours
C
Load where the maximum current is expected to exist for at least 5 hours
D
Load where the maximum current is expected to exist for at least 6 hours
Question 10 Explanation: 
The load where the maximum current is expected to exist for at least 3 hours is a continuous load.
Question 11
Please mark the minimum number of ft of vertical clearance that overhead communications cables should have considering all points of roofs from where they pass:
A
8 ft
B
4 ft
C
6 ft
D
12 ft
Question 11 Explanation: 
8 ft is the minimum number of vertical clearance that overhead communications should have.
Question 12
Please mark the maximum number of intervals for metal wireways when installed horizontally:
A
4 ft
B
2ft
C
6 ft
D
5 ft
Question 12 Explanation: 
5 ft is the minimum number of intervals for horizontally- installed metal wireways.
Question 13
Please mark the minimum number of ft from the inside walls of the pool for the location of receptacles that do not supply loads directly related to circulation systems:
A
3 ft
B
6 ft
C
4 ft
D
5 ft
Question 13 Explanation: 
The receptacles should be placed 6 ft from the inside walls of the pool.
Question 14
Please mark the number of inches for the securing of the flexible metal conduit within a termination:
A
3 in
B
16 in
C
18 in
D
12 in
Question 14 Explanation: 
12 in is needed for the securing of the flexible metal conduit within a termination.
Question 15
Please mark the needed number of ft that separates personal doors of equipment rated 800 A or more from the nearest edge of the working space:
A
6 ft
B
25 ft
C
13 ft
D
15 ft
Question 15 Explanation: 
Personal doors should be separated 25 ft from the nearest edge of the working space.
Question 16
What is the minimum number of in. that should separate coaxial cables and entering buildings from electric light and power or cable?
A
8 in.
B
10 in.
C
4 in.
D
6 in.
Question 16 Explanation: 
Coaxial cables and entering buildings should be separated with at least 4 in. from electric light and power or cable.
Question 17
Please mark the number of ft of clearance that overhead conductors rating 600V or less should have from portable amusement structures:
A
10 ft
B
14 ft
C
15 ft
D
20 ft
Question 17 Explanation: 
Overhead conductors rating 600V or less should have 15ft of clearance from portable amusement structures.
Question 18
What is the minimum ft of the length of a cord that is permitted for pool motors (with an attachment plug and containing a copper equipment grounding conductor not smaller than 12 AWG)?
A
3 ft
B
5 ft
C
4 ft
D
6 ft
Question 18 Explanation: 
A cord at a maximum length of 3 ft is permitted for pool motors.
Question 19
Please mark the minimum air changes per hour of mechanical ventilation in a pit area in commercial garages, repair and storage areas is classified as Class I, Division 2:
A
1
B
2
C
4
D
10
E
6
Question 19 Explanation: 
6 is the minimum air changes per hour of mechanical ventilation in a pit area in commercial garages, repair and storage areas is classified as Class I, Division 2.
Question 20
What is the maximum approval electrical trade size of IMC in in?
A
4 in
B
2 in
C
8 in
D
6 in
Question 20 Explanation: 
4 in is the maximum approval electrical trade size of IMC.
Question 21
Please mark the 125V receptacle outlets which must be GFCI protected which are not a part of the permanent wiring of the building used by personnel:
A
20A
B
15A
C
30A
D
All of the above are correct
Question 21 Explanation: 
15A, 30A, and 20A must be GFCI protected as 125 V receptable outlets.
Question 22
Please mark the number of Amperes of a maximum overcurrent protection for 12 AWG copper conductor:
A
25 Amperes
B
30 Amperes
C
20 Amperes
D
10 Amperes
Question 22 Explanation: 
20 Amperes is the maximum overcurrent protection for a 12 AWG copper conductor.
Question 23
Please mark the maximum percentage of rating od a branch circuit for an appliance that’s a continuous load of the marketed ampere ratings of the appliance:
A
90%
B
125%
C
100%
D
120%
Question 23 Explanation: 
125% is the maximum rating of the marked ampere ratings of the appliance regarding a branch circuit for an appliance that’s a continuous load.
Question 24
Please mark the branch circuit(s) on which grounding-type receptacles should be used:
A
10 A
B
20 A
C
15 A
D
B and C are correct
Question 24 Explanation: 
Both 15 A and 20 A are correct.
Question 25
Please mark the maximum distance that should be along the floor line of horizontally measured wall spaces:
A
3 ft
B
12 ft
C
4 ft
D
6 ft
Question 25 Explanation: 
6 ft is the maximum distance of any receptacles along the floor line of any wall space measured horizontally.
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