Question 1: In a Panel board two neutral conductors must not terminate on the same terminal.
- True
- False
NEC Reference: NEC 408.341
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NEC 2023
Panel and Switch Board- NEC Code Questions
Practice Questions on Panel and Switch Boards - NEC Code Questions
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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).
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TimePanel and Switch Board- NEC Code Questions — Question List
Question 2: When a panel board placed in a wet location there must be ................ inch air space between it and mounting surface?
- 1/4
- 1/2
- 3/4
- 1
Question 3: The over current protection must be placed on ........... side of transformer, if a panel board is supplied by the transformer?
- Primary
- Secondary
NEC Reference: NEC 408.36(B)
Question 4: The rating of over current protective device should ............. of the panel board rating in which it is located.
- not be greater than
- be 125%
- be greater than
- be 115%
NEC Reference: NEC 408.36
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.
- A, or First
- B, or Center Phase
- C or Third phase
- Any Phase
NEC Reference: NEC 408.3
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