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you have a 3/4 inch emt conduct there are 6 #12 thhn conductors in it how many # 10 thhn conductors can also be installed with 40% fill.
 
The host of this web site offers 10 question quizzes on three different code cycles and in two different syles, free and paid.

Quizzes
 
Many places will have more than just code related questions.

You are likely to have questions where basic electrical theory knowledge is needed, such as needing to know Ohms law and how to use it to solve a problem, you may need to know how to calculate voltage drop.

You may even have questions about things that appear on a blueprint.

You will likely need to answer questions concerning laws of the jurisdiction you are testing in also.
 
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