Journeyman Electrician Practice Exam 2025 – The All-In-One Guide to Exam Success!

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What is the minimum AWG size allowed for Class 3 single conductors used as other wiring within buildings?

16 AWG

18 AWG

The minimum AWG size allowed for Class 3 single conductors used as other wiring within buildings is 18 AWG. This specification is established by the National Electrical Code (NEC), which regulates the safe installation of electrical wiring and equipment. Class 3 circuits are specifically designed for low-power applications, and the 18 AWG size is adequate to handle the current levels while maintaining proper safety standards.

Using this size helps ensure that the conductors are capable of carrying the required current without overheating and also allows for proper termination in standard electrical connectors. Smaller conductor sizes, such as 20 AWG or 22 AWG, would not meet the minimum requirements for Class 3 wiring due to their insufficient ampacity for typical applications within buildings. Thus, 18 AWG provides a safe and efficient choice, aligning with best practices in electrical installations.

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20 AWG

22 AWG

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