If cable trays aren't properly grounded or bonded, they can send misleading signals, cause the system to trip, or even break the instrument. Make sure that the tray length is always grounded. Use certified conductors to adequately bond all parts of the tray. Power circuit grounding of cable trays is explained in CTI Technical Bulletins, Titles No. It is also covered in NEMA Standard VE-2. Set up to allow for future growth without interfering with current operations. Common types of trays used in instrumentation projects include:. All metallic cable trays shall be grounded as required in Article 250. The cable. The flexibility and scalability of cable trays make them an ideal choice for environments where cable density and organization can significantly impact operational efficiency. This compliance is not. Earthing creates an alternative path for flow of excessive currents safely into the ground in presence of minimal resistance or impedance.
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