Up to a tray width of 300 mm, the mounting of the joint plate is optional. Place the joint plate centrally on the joint. In this video, we will show you how to use 3 different cover clamps (PKP-SP1, PKP-SP2 & PKP-SPM1) that enables additional mechanical fastening of the cable trays cover. more In this. When developing our cable support OBO can offer reliable solutions for systems, three attributes are at the routing and fastening cables securely core of what we do: efficiency, resil- for each of these installation challeng-ience and safety. es in the industrial environment. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Connecting cable trays correctly is essential for system safety, load stability, and long-term performance. Choosing the right one depends on project conditions, load. The B-Line series Cable Tray Manual was produced by our technical staff. The following pages address the 2014 National Electrical Code® requirements for cable tray systems as well as design. But before you lay the first tray or clamp down a single cable, you need a solid plan. Plan the Route Before You Drill No installation should start without a plan.