The raised stripe line or rib going along a wire is likely a conductor identification mark. This mark helps differentiate wires within a bundle or cable, making it easier to identify them for wiring purposes.

Here are some potential reasons for the raised stripe:

* Color Coding: The stripe can be a different color than the wire itself, aiding in visual identification within a bundle.

* Material Differentiation: The stripe might be made from a different material than the wire, indicating a difference in conductivity or insulation properties.

* Voltage Rating: The stripe might denote the wire's voltage rating, especially in high-voltage applications.

* Gauge Identification: The stripe could indicate the wire's gauge or diameter, important for choosing the right wire for specific applications.

To understand the exact meaning of the stripe, you need to consult the wire's specification sheet or manufacturer's documentation.

If you're unsure, it's best to err on the side of caution and consult with an electrician or a qualified professional.