Here is a suggested color code to use on the binding posts/terminals if your interested in keeping separate colors for the different voltage levels in a project.
| Voltage Type | Color |
|---|---|
| Positive DC Voltage | Red |
| Secondary Positive DC Voltage | Brown |
| Ground | Black |
| Negative DC Voltage | Yellow |
| Secondary Negative DC Voltage | Gray |
| Chassis or Earth | Green (or Bare) |
| Low Voltage AC (Under 48VAC) | Purple or Violet |
| Secondary Low Voltage AC (Under 48VAC) | Blue |