I have used an outer flexible tubing to cover my electrical cords in different use cases outside, and I think it would also work to protect the wires on the cameras too. This tubing comes in different diameters and colors with a split down the side for easy installation. I know over time the UV light from the sun will make cheap electrical cords crack and dry rot. This tubing would help protect the power cords.
https://www.amazon.com/dp/B00TE1L8ZW/ref=cm_sw_r_cp_tai_SCf1Db34T9XRZ
