Conduits, cable trays, ladder trays, innerducts, and other cabling pathway elements shall be labeled with the pathway identifier at pathway openings and every 25 feet along the element, when possible. Device labels shall be installed on the exterior of all devices . Hubbell Wiring Device-Kellems and Hubbell Premise Wiring are divisions of Hubbell Incorporated, a U. headquartered manufacturer with over 130 years of supplying solutions for the electrical and data markets. Hubbell's strength is demonstrated by a long-standing reputation for supplying reliable. In a structured cabling environment, clarity, continuity, and control are built into every element of the installation—but nowhere is this more critical than in how assets are labelled and traced. Label schedules are the foundation of this clarity. Without a robust and methodically applied. Plant Operations requires adherence to this standard for all OSP cabling. Most identifiers are set by Homewood 14 Plant Operations and a review meeting would enable identifiers to be resolved during planning and. It is quite common to see cable trays used to carry DC PV source circuits operating over 600 volts. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. When every line has a clear ID and a passport, any engineer.