B-Line Eaton series imperial cable tray and ladder, 4" Height, 27" Length, 24" Width, 24" and 12" Tray widths, Series 2-5 horizontal reducing tee, Alu

The Eaton B-Line 4A-24-12-HT12 horizontal tee joins a 24 inch wide tray run to a 12 inch wide branch. That is what makes it a reducing tee rather than a straight tee: the run side matches 24 inch tray and the branch drops to 12 inch. If both your run and branch are the same width, this is not the right fitting.

It is a 12 inch radius fitting. The radius sets the minimum bend the cable takes turning into the branch, so it has to be at or above the bending radius the cable manufacturer calls out for your largest conductor. If your cable needs more than 12 inches, specify a larger radius tee instead.

Plan for a fitting that runs 27 inches in length and 24 inches in width, with 4 inch side rails. The 12 inch radius on the branch is what drives that 27 inch dimension, so allow that clearance off the main run before you set your hangers and trapeze supports.

The 4A-24-12-HT12 carries CSA certification, which is what an inspector on a Canadian job will be looking for on the tray system.

Order Eaton B-Line 4A-24-12-HT12. That number reads out as 4 inch aluminum, 24 inch run, 12 inch branch, horizontal tee, 12 inch radius, which is how the imperial cable tray fittings are coded.

It weighs 14.96 lb. Light enough for one electrician to set on a trapeze at height, and worth adding to your hanger load calc along with the cable fill, since a tee concentrates weight at the junction.

This tee is aluminum, which is the usual pick where weight and corrosion matter, such as exterior runs, wash-down areas, and long spans where you want less load on the supports. Steel tray fittings are the other route, but you cannot mix them in the same run and expect the rails and hardware to line up, so match the material of the tray you already have.