B-Line Eaton series runway dropout kit, provides a smooth radius for cable exit, Universal, Aluminum, Flat black powder coat

The Eaton B-Line SB78718FB dropout kit gives cable a smooth radius where it leaves the runway and turns down to a rack or cabinet. Running copper or fiber straight over a bare runway edge puts it against a sharp corner and violates bend radius, which is where jacket damage and fiber attenuation come from. The kit is the piece that protects the cable at the transition point.

It is a universal drop-out, so it is built to mount to a range of runway sizes rather than a single proprietary width. The body measures 17.44 in across, 4 in high and 4 in deep, so measure your runway stringer-to-stringer opening against that 17.44 in dimension before ordering.

UL Listed, which is what inspectors and spec writers on telecom and data center work usually want to see on runway accessories. That listing is stated for this dropout kit specifically.

One per cable exit point. The SB78718FB handles a single drop, so if cable leaves the runway above four cabinets you need four of them. Order by the number of turn-down locations on your drawing, not by runway length.

Allow at least 4 in of vertical clearance under the runway, since the unit is 4 in high and 4 in deep. In rooms with tight headroom above cabinets, check that dimension against the gap between runway bottom and cabinet top before you set your runway height.

The kit is aluminum with a flat black powder coat finish, the standard finish used on black runway, ladder rack and two-post racks in telecom rooms. It will read the same as black runway from other manufacturers, though exact shade can vary slightly between brands.

No. At 1.1 lb the aluminum dropout adds almost nothing to the runway load, so it does not change your threaded rod or wall angle support spacing. Plan support for the cable bundle weight passing through it, not for the fitting itself.