| Subject Areas | % of Questions |
|---|---|
| General Sound Systems | 30 |
| Grounding | 17 |
| Permanent and Portable Audio Systems | 13 |
| Sensitive Electronic Equipment | 17 |
| Class 1, Class 2 and Class 3 Circuits | 23 |
We highly recommend that you purchase one of the reference books above to study for your exam. Each book is a comprehensive subject index to the NEC. They provide an even faster way to look up answers in the code and are far more detailed than the index at the end of the code book.
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