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Free Electrician Practice Test

Take our free electrician practice test with 20 questions covering NEC code, grounding and bonding, and load calculations. See your score instantly.

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This free electrician practice test includes 20 multiple-choice questions drawn from the same subject areas covered on journeyman and master electrician licensing exams. Questions cover the National Electrical Code (NEC), grounding and bonding, load calculations, wiring methods, and overcurrent protection.

After you submit, you will see your score, the correct answer for each question, and a plain-English explanation. Use missed questions to identify the NEC articles you need to review before your exam.

These questions are for study practice only and are not official exam questions. ExamsLib is not an official licensing authority. Passing this practice test does not guarantee a passing score on your state licensing exam.

These questions are for study practice only and are not official exam questions.

Question 1

Bonding is required on metal gas piping in a building primarily to:

Question 2

What is the function of the grounding electrode conductor (GEC)?

Question 3

A residential dwelling has 2,000 sq ft of living space. Using 3 VA/sq ft for general lighting and applying 100% demand on the first 3,000 VA and 35% on the remainder, what is the calculated general lighting demand load?

Question 4

When sizing a service for a residence, which of the following loads is typically added at 100% of its nameplate rating with no demand factor applied?

Question 5

A commercial occupancy has a calculated total connected load of 156,000 VA at 208Y/120 V, 3-phase. What is the approximate minimum ampacity required for each phase of the service?

Question 6

When calculating the load for a commercial kitchen with multiple pieces of electric cooking equipment, which approach is commonly permitted to reduce the calculated load?

Question 7

When service-entrance conductors consist of two sets of 350 kcmil copper in parallel per phase, what total cross-sectional area is used to size the supply-side bonding jumper per NEC 250.102(C)(1)?

Question 8

At a separately derived system (such as a transformer secondary), where is the system bonding jumper required to be installed?

Question 9

GFCI protection is required for receptacles in which of the following locations?

Question 10

What is the maximum spacing between wall receptacle outlets in a dwelling unit living area, measured along the floor line?

Question 11

Which NEC term describes the conductive connection that joins together metal parts of an electrical system to establish electrical continuity, but is NOT intended to carry fault current to earth?

Question 12

An equipment grounding conductor run with a 60-ampere branch circuit must have a minimum copper size of:

Question 13

Two separate buildings on the same property are supplied from a common service. An equipment grounding conductor is run with the feeder to the second building. Which statement is correct regarding the neutral-to-ground bond at the second building's panelboard?

Question 14

A 208-volt, 3-phase induction motor has a nameplate full-load current (FLC) of 18 amperes. What is the minimum branch circuit conductor ampacity required by the NEC?

Question 15

Using the NEC optional method (220.82) for a 240-volt single-phase service, the first 10 kVA of total calculated load is taken at 100% and the remainder at 40%. If a home's total connected load before demand factors is 48 kVA, what is the minimum calculated demand load in kVA?

Question 16

What is the difference between grounding and bonding?

Question 17

Why is the neutral conductor NOT bonded to the equipment ground bar in a subpanel (remote distribution panel)?

Question 18

The NEC informational notes recommend limiting voltage drop on a branch circuit to what maximum percentage for satisfactory equipment operation?

Question 19

A 240V, single-phase motor has a full-load current (FLC) of 18A. Using NEC Table 430.52, what is the maximum rating of an inverse-time circuit breaker permitted as the branch-circuit short-circuit and ground-fault protective device?

Question 20

A 240-volt, single-phase household electric range is rated at 12 kW. Using NEC Table 220.55 Column C (one range), what demand load is used for service calculations?

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Frequently asked questions

What topics does this electrician practice test cover?

The practice test covers NEC code, grounding and bonding, load calculations, wiring methods, and overcurrent protection. Questions are drawn from the same subject areas tested on most state journeyman and master electrician licensing exams.

How many questions are on the practice test?

This free practice test contains 20 multiple-choice questions. A passing score for practice purposes is 70 percent or better (14 out of 20 questions correct).

Is this practice test the same as the real electrician licensing exam?

No. These questions are for study practice only and are not official exam questions. The real licensing exam is administered by your state licensing board or its approved testing provider. ExamsLib is not an official licensing authority.

Can I retake the practice test?

Yes. You can take the practice test as many times as you need. A different set of questions may be assembled from the question bank on each attempt, giving you fresh practice opportunities.

Do I need to create an account to take the practice test?

No account or login is required. The practice test is completely free and your results are saved locally in your browser.