Take our free electrician practice test with 20 questions covering NEC code, grounding and bonding, and load calculations. See your score instantly.
These questions are for study practice only and are not official exam questions.
Question 1
1
What is the primary purpose of grounding an electrical system?
Question 2
2
What is the difference between grounding and bonding?
Question 3
3
Which conductor connects the grounded circuit conductor (neutral) to the grounding electrode at the service?
Question 4
4
Which of the following is a recognized grounding electrode type?
Question 5
5
In a residential installation, the equipment grounding conductor (EGC) in a branch circuit is normally identified by which color or marking?
Question 6
6
A metal water piping system is being used as a grounding electrode. Where must the bonding connection to this electrode be made?
Question 7
7
Bonding is required on metal gas piping in a building primarily to:
Question 8
8
What is the function of the grounding electrode conductor (GEC)?
Question 9
9
In a separately derived system (such as a transformer secondary), where is the system bonding jumper installed?
Question 10
10
Why is the neutral conductor NOT bonded to the equipment ground bar in a subpanel (remote distribution panel)?
Question 11
11
Which of the following best describes the purpose of a ground rod as a grounding electrode?
Question 12
12
A single ground rod is installed and tested. Its measured resistance to earth is 35 ohms. What additional action is generally required?
Question 13
13
An equipment grounding conductor (EGC) must be sized based on which of the following?
Question 14
14
When metal conduit serves as the equipment grounding conductor, which condition is most critical to ensure it provides an effective fault-current path?
Question 15
15
What is the standard unit used to express electrical power in load calculations?
Question 16
16
Using Ohm's Law, if a 120 V circuit has a resistance of 12 ohms, what is the current flowing?
Question 17
17
What does 'demand factor' mean in load calculations?
Question 18
18
A 240 V, 20 A circuit feeds a water heater. What is the load in volt-amperes (VA)?
Question 19
19
In a standard residential load calculation, what general lighting load value (in VA per square foot) is commonly used for dwellings?
Question 20
20
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?
Enable JavaScript for the interactive step-by-step quiz with instant scoring and explanations.
