B-Line Eaton series imperial cable tray and ladder, 4" Height, 15" Length, 30" Width, Series 2-5 vertical tee down, Aluminum, 12" Radius

A vertical tee down joins a straight cable tray run to a branch that drops away vertically, forming a three-way intersection where one leg heads downward. The Eaton B-Line 4A-30-VT12 is the aluminum version built for 30 inch wide, 4 inch deep tray with a 12 inch bend radius on the drop. If your branch runs off to the side in the same plane instead of dropping, you want a horizontal tee, not this fitting.

The radius sets how tightly the cable bends as it turns down through the fitting, and it has to be at least the minimum bend radius of the largest cable in the tray. This tee is built on a 12 inch radius. Large power conductors and fiber often call for more, in which case you would specify a larger radius fitting instead; using too tight a radius damages insulation and voids cable ratings.

Aluminum. That is the usual choice where weight on the support structure is a concern or where the run sees damp or corrosive conditions that would attack plain steel. It also means you should keep your fittings, straight sections, and hardware in the same material family through the run rather than mixing aluminum fittings into a steel tray system.

Yes, it carries a UL Classified marking, which is what most specs and inspectors look for on cable tray used as an equipment grounding conductor path or in classified installations. If your drawing calls out UL Classified tray and fittings, this fitting meets that call-out.

Order Eaton B-Line 4A-30-VT12. In that designation the 4A is the 4 inch aluminum rail, 30 is the tray width in inches, and VT12 is the vertical tee with a 12 inch radius. Splice plates and connection hardware are ordered separately from the fitting.