The Cable Tray Rubber End Cap is used to protect the engine wiring harness within the cable tray. It seals off the openings of the cable tray, preventing the ingress of dust, water, and other contaminants that could potentially damage the wiring and electrical components. What Are the Main Components of a Cable Tray System? The main components of a cable tray system include tray sections, fittings, supports, and accessories. The Cable Tray ng standards, performance standards, test standards and application in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or. Cable end caps play a crucial role in protecting and sealing electrical cables, ensuring their long-term performance and reliability. With a wide range of cable end caps available on the market, understanding their specifications and differences is essential for selecting the right product for your. MP Husky offers a wide variety of covers to provide protection for the cables contained within the system from sunlight, environ-mental elements, dirt, debris, and falling objects. All of the covers listed here are used for indoor as well as outdoor applications.