This is a critical distinction because it means the requirements for the cable contained in raceway is different than cable supported by cable tray.
Low voltage cable tray grounding.
The egc is the most important conductor in an electrical system as its function is electrical safety.
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Generally speaking raceway completely encloses the cable inside of it.
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All metallic cable trays shall be grounded as required in article 250 96 regardless of whether or not the cable tray is being used as an equipment grounding conductor egc.
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Crimped connectors can be attached on coaxial cable or ethernet cables.
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The manufacturer may supply cable tray sections and fittings without.
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Where cable tray systems contain only signal and communication circuits that operate at low energy levels power grounding per nec section 318 7 is not appropriate but cable tray grounding for lightning protection noise and electromagnetic interference is necessary.
The metal in cable trays may be used as the egc as per the limitations of table 392 60 a.
This entry was posted in technical articles on 2017 05 23 by danlic.
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Copper bare covered.
Cable tray assemblies have been investigated for bonding between sections using the minimum hardware provided by the manufacturer.
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When installed correctly cable tray systems can be a valuable part of a site s ground network capable of transmitting to ground any fault currents imposed on the system.
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Medium voltage primary underground distribution.
