The National Electrical Code (NEC) is the ultimate authority for any cable tray installation. Specifically, NEC Article 392 governs the use, installation, and construction specifications for these systems. 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. A printable 2-page reference card sent to your inbox. Need to renew your Electrician license? Pick your state and browse state-approved Electrician CE courses — complete your continuing education hours online, with instant reporting. Source Limitations: Obtain cable tray components through one source from a single manufacturer.
