MI cables are highly durable and fire-resistant, making them suitable for direct installation without trays in many applications. According to the Cable Tray Institute, MI cables have been permitted in Class I, Division 1 and Class II, Division 1 hazardous locations since the 1962 NEC and can be installed in cable trays if desired, but trays are not mandatory . They can also provide fire protection when installed without trays, which is one of their key advantages.
Cable trays are often used for MI cables to:
While MI cables can be installed in cable trays, they do not require them. The choice depends on installation convenience, code compliance, environmental conditions, and maintenance considerations. Trays are optional support systems rather than a mandatory requirement for MI cable installations .
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Cable tray is considered to be a system. It must provide continuous support for cables, and the electrical continuity of the cable tray
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