Practice test

California Journeyman Electrician Practice Test

Free California journeyman electrician practice test with 20 NEC-based questions. Covers grounding, load calculations, and wiring methods. Instant scoring.

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

Question 1

1

What is the function of the main bonding jumper in a service panel?

Question 2

2

In a typical dwelling electrical system, where is the grounded (neutral) conductor permitted to be bonded to the equipment grounding conductors?

Question 3

3

Under the NEC, the grounding electrode conductor run to a driven ground rod is not required to be larger than what size copper conductor?

Question 4

4

A concrete-encased electrode (Ufer ground) using steel reinforcing bars must consist of at least how many feet of bare rebar not smaller than 1/2 inch in diameter?

Question 5

5

What is the minimum length of a driven rod electrode under the NEC?

Question 6

6

Per NEC 250.4, why is the earth itself NOT permitted to serve as the effective ground-fault current path?

Question 7

7

A single ground rod is installed and its resistance to earth measures 40 ohms. What does the NEC require?

Question 8

8

Using the NEC table for equipment grounding conductors, what is the minimum size copper EGC for a branch circuit protected by a 60-ampere breaker?

Question 9

9

A building has a metal water piping system that is likely to become energized. What does NEC Article 250 require?

Question 10

10

An isolated-ground receptacle is installed to reduce electrical noise for sensitive equipment. How must its insulated equipment grounding conductor be run?

Question 11

11

A detached garage is supplied by a feeder from the house. Under the current NEC, how are the neutral and grounding conductors handled at the garage panel?

Question 12

12

A service is supplied by 500 kcmil copper conductors. Per the NEC table for grounding electrode conductors, what is the minimum copper GEC to a metal water pipe electrode?

Question 13

13

Circuit conductors are upsized from 12 AWG to 8 AWG copper to limit voltage drop on a long 20-ampere run. What does the NEC require for the equipment grounding conductor?

Question 14

14

In a standard dwelling load calculation, what unit load does the NEC assign for general lighting and receptacles?

Question 15

15

How many small-appliance branch circuits does the NEC require for a dwelling kitchen, and what load is assigned to each in the service calculation?

Question 16

16

What load must be included in a dwelling service calculation for the required laundry branch circuit?

Question 17

17

A branch circuit supplies a continuous load of 32 amperes. What is the minimum rating of the overcurrent device?

Question 18

18

A 240-volt single-phase load draws 20 amperes. What is its apparent power?

Question 19

19

A 2,400 sq ft dwelling has two small-appliance circuits and one laundry circuit. Using the standard method demand factors, what is the demand for the general lighting group?

Question 20

20

Using the NEC demand table for household ranges, what demand load is used for one 12 kW electric range in a dwelling service calculation?

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