Which statement about DC power conductor color-coding variability is true?

Which statement about DC power conductor color-coding variability is true?

• A. Color schemes are identical across all manufacturers.
• B. Color schemes vary by manufacturer; always refer to the wiring diagram.
• C. Only red and black are used in DC power.
• D. White is always the positive conductor.

Answer: (B)

DC power conductor color-coding isn’t universal; different manufacturers and equipment programs adopt their own schemes. Because of this variability, the only reliable way to interpret wire colors is to check the wiring diagram or the manufacturer’s harness documentation for what each color represents. This practice helps prevent misidentifying conductors and ensures correct, safe connections. Color schemes being identical across all manufacturers isn’t true, so there isn’t a single standard you can rely on everywhere. The idea that only red and black are used is overly restrictive—other colors may appear for special functions, grounds, or auxiliary circuits depending on the system. And white being always the positive conductor is not a universal rule; connector and system conventions vary, so you shouldn’t assume polarity from color alone.

DC power conductor color-coding isn’t universal; different manufacturers and equipment programs adopt their own schemes. Because of this variability, the only reliable way to interpret wire colors is to check the wiring diagram or the manufacturer’s harness documentation for what each color represents. This practice helps prevent misidentifying conductors and ensures correct, safe connections.

Color schemes being identical across all manufacturers isn’t true, so there isn’t a single standard you can rely on everywhere. The idea that only red and black are used is overly restrictive—other colors may appear for special functions, grounds, or auxiliary circuits depending on the system. And white being always the positive conductor is not a universal rule; connector and system conventions vary, so you shouldn’t assume polarity from color alone.