All housings are color keyed. This means gray housings will only plug into gray housings. Gray housing won't plug into red or blue housings. Similarly, the color key feature makes it possible for you to differentiate voltages of your electrical circuits. For example, you do not want to plug a 36 volt battery pack into a 48 volt charger. Color keying your wiring will help to prevent expensive and dangerous damage. Gray housings are by far the most commonly used color. People who have only one voltage in their work environment tend to use gray housings no matter what the voltage is. However, if you have multiple voltages in your work environment, we would strongly recommend that you follow the industry color code guidelines listed below.
Industry recommendations:
Housing
Voltage
Red
24
Black
26
Blue
48
