B-Line Eaton series imperial cable tray and ladder, 4" Height, 30" Length, 30" Width, 30" and 12" Tray widths, Series 2-5 horizontal reducing tee, Alu

A horizontal reducing tee is the fitting that lets a cable tray run branch in three directions on the flat while stepping down to a narrower tray on the branch. The Eaton B-Line 4A-30-12-HT12 joins 30 inch and 12 inch tray widths in one piece, so you don't need a separate tee plus a reducer to get from a 30 inch main run to a 12 inch spur.

The fitting is built on a 12 inch radius. That is the inside turn the cables follow through the branch, so any cable in the run needs a manufacturer minimum bend radius of 12 inches or less. Large power feeders and some fiber assemblies call for more than that, and those runs need a larger radius fitting instead.

Lay out 30 inches of length by 30 inches of width for the fitting footprint, with 4 inches of rail depth. On a 12 inch radius tee that footprint is what governs your clearance to walls, duct, and structure at the branch point, so it belongs on the coordination drawing before the hangers go in.

Order splice plates and connection hardware separately. The 4A-30-12-HT12 is the formed tee section itself; each of its three ends still has to be spliced to the adjoining tray, so count six splice plates plus bolt kits for a three-way fitting, in aluminum to match the fitting.

A reducing tee does both jobs in one piece: it branches the run and changes width in the same fitting. Going the other route means a full width tee plus a reducer section on the branch, which adds a joint, adds length, and adds two more splice points to support. Use the straight tee plus reducer only when the width change has to happen some distance away from the branch. Here the change is built in at 30 inch to 12 inch.

Horizontal only. It is a horizontal reducing tee, meaning the branch is taken off on the flat plane of the run. A change of elevation needs a vertical inside or outside bend, and a drop off the side of the run needs a different fitting entirely.

Eaton B-Line model 4A-30-12-HT12. The number reads out the fitting: 4 inch aluminum, 30 inch and 12 inch tray widths, horizontal tee, 12 inch radius. Give that to the supply house and it identifies the fitting without further description.

CE marked. That is the marking carried on the fitting record; no other listing or grade is claimed for it.

16.18 lb bare. Add that to the cable fill at the branch when you size the trapeze or the threaded rod at that support point, since a three-way fitting usually needs a hanger on each leg near the joint rather than one hanger under the middle.