For a few types of installations, the National Electrical Code (NEC) specifies the cable tray type to be used: Single conductor cables and Type MV cables must be installed in ladder or ventilated trough cable trays. For a few types of. Selecting the right type of tray is critical for performance and safety. Ladder Type: The strongest design, featuring side rails and connecting rungs. Its open structure provides excellent cable ventilation, making it ideal for supporting large power cables in heavy industrial applications with. A cable ladder, also known as a ladder cable tray, is a support system that consists of two longitudinal side rails connected by individual rungs. These rungs are spaced at regular intervals and provide a structure that resembles a ladder—hence the name. Alternative names include: cable runway and. Avoid these common pitfalls to ensure effective cable management: 1.