The 2026 National Electrical Code (NEC) Section 392.18(F) specifies that at least 12 inches of access space above cable trays must be maintained to permit installation and maintenance of cables . This update replaces the previous subjective requirement of “adequate access,” providing a clear, measurable standard that aligns with ANSI/TIA/EIA-569-A for telecommunications pathways .
There are several exceptions where reduced clearance is allowed:
Maintaining 12 inches of vertical clearance above cable trays ensures safe access for installation and maintenance, reduces the risk of mechanical damage, and ensures compliance with NEC standards. Proper planning for tray fill, cable type, separation, and support spacing further enhances safety and long-term reliability .
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