Fortunately, there's a simple and effective solution: cable raceways, also known as wall cord covers or surface raceways. That is, it covers the top section of the cable tray. In this guide, you will learn about the different types of cable. Choosing the right cable tray cover is an essential yet often overlooked aspect of electrical system design. Whether you are working in high-traffic office spaces, corrosive industrial environments, or aesthetic-sensitive areas like hotels and shopping malls, the importance of selecting the. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray.