Cable Tray Fill Rules (NEC 392)
A cable rated at 65A in a single conduit run drops to 32.5A when packed in a full cable tray. This derating can force you to use a wider tray, add a second tray, or increase conductor sizes.
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Cable Laying Inside Tray
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A generic guideline developed by the Cable Tray Institute indicates that cable trays should not be filled in excess of 40-50% of the inside area of the tray or of the tray''s maximum weight based on the cable
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