Cable Management Tray Size: Choose a tray size that will hold the desired amount and length of cable. Support Spacing: Remember the NEC requires no more than 4 feet of support spacing. Bend Radius: The tray cable bend radius should be supported to avoid damaging. Shielding helps contain EMI, allowing for reduced spacing. Prevents obstruction, ensures structural integrity, aids future installation, ventilation, and cooling. Allows easy access and efficient maintenance. With our many years of experience, we are one of the leading manufacturers in this field. Nearly every. The National Electrical Code is a set of principles designed to promote public safety and welfare, as well as safeguard public health by regulating the design and operation of electrical facilities and systems.