According to the National Electrical Code (NEC), all wire splices and connections must be enclosed in an approved junction box to ensure safety, accessibility, and protection from physical damage (NEC 314.16, 314.17) . A key requirement is that junction boxes must remain accessible without removing building structures, meaning they cannot be hidden inside cable trays or other enclosures that would prevent inspection or maintenance .
Cable trays are designed to support and route cables, not to serve as enclosures for splices or junction boxes. While you can mount a junction box on the side or bottom of a cable tray, placing splices directly inside the tray is generally not allowed except in certain industrial applications under NEC 392.6(J) . This ensures that splices are protected, serviceable, and compliant with box fill and grounding requirements .
While cable trays provide excellent cable management, junction boxes must remain separate and accessible. Splices should never be placed directly inside the tray except in specific industrial exceptions. Proper mounting, box selection, and adherence to NEC rules ensure safety, code compliance, and ease of maintenance .
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