Which option best describes the part of wiring standards that governs color codes and sizing?

• A. Sizes
• B. Codes
• C. Insulation
• D. Connectors

Answer: (B)

Wiring standards are governed by codes—the organized set of rules that specify how electrical installations must be done. These codes define the color coding used to identify conductors and provide the tables and criteria that determine which wire sizes are permissible for different applications. In other words, the codes establish the official requirements for both identifying wires by color and selecting the appropriate gauge to handle the expected current safely, preventing overheating and ensuring compatibility across installations. The other terms describe parts of the hardware or measurement concepts, but they don’t embody the overarching framework that standardizes color and size across projects.