What is the minimum permitted size fixture wire?

What is the minimum permitted size fixture wire?

• A. No. 14
• B. No. 12
• C. No. 18
• D. No. 16

Answer: (C)

The minimum permitted size for fixture wire is No. 14, which is suitable for most general lighting circuits and commonly accepted standards in the electrical industry. Fixture wires must meet specific ampacity requirements based on the load they are expected to carry. While No. 18 and smaller sizes are permissible for certain low-power applications, they do not generally meet the minimum requirements for standard fixture installations.

No. 14 provides adequate capacity and safety margins for typical fixtures without risk of overheating or other electrical hazards. It's critical to adhere to the National Electrical Code (NEC) and local codes, which dictate wire sizing based on various factors such as length of the run, type of load, and ambient temperature. Thus, selecting the correct size is essential to ensure compliance and safety in electrical installations.