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NEC CODE NEC 2023

Panel and Switch Board- NEC Code Questions

Practice Questions on Panel and Switch Boards - NEC Code Questions

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Yes — free, no signup required. Each question links to the relevant NEC article so you can study the code directly.

The National Electrical Code (NFPA 70) is the benchmark standard for safe electrical installation in the US. It is updated every 3 years by the NFPA.

Study the edition adopted by your state. As of 2025, most states use the 2020 or 2023 NEC. These tests are written to the 2023 edition.

The most tested articles are 100 (Definitions), 200–250 (Wiring & Grounding), 300–314 (Wiring Methods), 400–411 (Conductors), 430 (Motors), and 700–701 (Emergency Systems).

How to Use This Practice Test

This Panel and Switch Board- NEC Code Questions has 5 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Use the NEC index (back of the book) — find answers by keyword, not by article number.

Topics covered: NEC articles 100, 210, 220, 240, 250, 300, 310, 430, and special occupancies.
Passing score: Aim for 80%+ on NEC code tests before exam day.
Questions: 5 multiple-choice, one correct answer each

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Key NEC References for This Test

Article	What It Covers
Ch. 1–4	General rules — apply to all installations
Ch. 5–7	Special rules — override Ch. 1–4 where they conflict
Ch. 8	Communications — completely independent of Ch. 1–7
Ch. 9	Tables — referenced by articles, not standalone enforceable rules
Art. 210.12	AFCI — major expansion in NEC 2026
Art. 230.67	Surge protection at service equipment — new NEC 2026

Study Tip: Learn the NEC index — use keywords, not article numbers. Practice finding 5 different topics in under 2 minutes each.

Panel and Switch Board- NEC Code Questions

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Key NEC References for This Test

Panel and Switch Board- NEC Code Questions

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Frequently Asked Questions

Is this Panel and Switch Board- NEC Code Questions free?

What is the NEC code book?

Which NEC edition should I study?

What articles are covered on electrician licensing exams?

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Panel and Switch Board- NEC Code Questions — Question List

Question 1: In a Panel board two neutral conductors must not terminate on the same terminal.

Question 2: When a panel board placed in a wet location there must be ................ inch air space between it and mounting surface?

Question 3: The over current protection must be placed on ........... side of transformer, if a panel board is supplied by the transformer?

Question 4: The rating of over current protective device should ............. of the panel board rating in which it is located.

Question 5: A panel board or switch board connected to 3 phase [A,B,C] 4 wire delta connected system must have high-leg conductor terminal to the .................. phase of the switch board.

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