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

The 4A-24-HT12 is built for 24 inch wide tray with a 4 inch side rail height. Both the branch and the run legs match that same 24 inch width and 4 inch profile, so it drops into a straight section of 24 inch by 4 inch aluminum Series 2-5 tray. If your run is a different width, you need the tee sized to that width instead.

Plan on 27 inches of length for the fitting itself. With a 12 inch radius on a 24 inch wide tray, the tee measures 27 inches along the run, so cut your straight sections to leave that gap plus whatever your splice plates require at each connection point.

Yes, the Series 2-5 aluminum horizontal tee is UL Classified. That is the listing engineers and inspectors look for when cable tray is used as an equipment grounding conductor or where the spec calls out UL classified tray systems.

The 4A-24-HT12 is the tee fitting itself. Splice plates, connection hardware and any hangers or supports at the fitting are ordered separately, so add them to the same order if your run does not already have them on hand.

A horizontal tee takes a straight tray run and branches a third leg off it at 90 degrees in the same plane, flat, with all three legs level. Use it where a feeder splits to serve two areas off one main run. If the branch has to rise or drop instead of staying flat, that is a vertical elbow or a horizontal cross job, not this fitting; a cross is what you want when the run continues straight and branches go both directions.

The one you want is 4A-24-HT12: 4 inch rail height, aluminum, 24 inch width, horizontal tee, 12 inch radius. The number reads straight across the specs, so if your drawing calls for a different width or radius the corresponding digits change while the HT designation stays.