B-Line Eaton series imperial cable tray and ladder, 6" Height, 30" Length, 30" Width, 30" and 12" Tray widths, Series 2-5 horizontal reducing tee, Alu

It's a horizontal tee that also changes tray width: the 6A-30-12-HT12 joins a 30 inch wide run to a 12 inch wide branch, so you get the branch takeoff and the reduction in one aluminum fitting instead of a straight tee plus a separate reducer. Tray depth stays at 6 inches through the fitting.

The fitting is built on a 12 inch radius. That's the number to check against your cable's minimum bending radius before you pull: if the manufacturer's minimum bend for the largest conductor in the run exceeds 12 inches, this fitting will overbend it at the turn and you need a larger radius fitting instead.

It's a Series 2-5 fitting in 6 inch depth, so it mates to Series 2-5 aluminum tray of the same 6 inch loading depth: 30 inch width on the run side, 12 inch on the branch. If your existing tray is a different B-Line series or a different rail depth, the side rails won't line up and you need the fitting that matches your series.

Plan on a 30 x 30 x 6 inch envelope for the fitting itself, with a 12 inch radius at the turn. On a reducing tee the widest dimension matches the 30 inch run tray, so if the main run clears the obstruction, the tee will too, but the branch side steps down to 12 inches.

The 6A-30-12-HT12 is UL Classified. Aluminum tray and fittings carry that classification so the tray system itself can serve as an equipment grounding conductor where the AHJ and the installation permit it. Confirm the classification marking on the fitting matches what your inspector wants to see for the specific run.

The 6A-30-12-HT12 is aluminum, which self-passivates and doesn't need galvanizing to resist atmospheric corrosion, so it's the common choice for coastal, food processing, and wash-down areas where plain steel tray rusts at the cut edges. Where you have strong alkalis or direct contact with wet concrete, aluminum is the wrong metal and you want a coated steel or fiberglass tray system.

For a 30 inch run with a 12 inch branch, the reducing tee does it in one piece. The 6A-30-12-HT12 handles both tray widths itself, which means one fitting, one set of splice connections at each end, and no short filler section between a tee and a separate reducer. Use the straight tee plus reducer approach only when the reduction has to happen somewhere other than at the tee.

Order the connection hardware separately. What you receive is the reducing tee fitting itself, model 6A-30-12-HT12, in aluminum. Count your joints when you spec: a tee has three connection points, two at the 30 inch run ends and one at the 12 inch branch, and each needs a matched splice plate set and bolts for Series 2-5 aluminum tray.