B-Line Eaton series imperial cable tray and ladder, 4" Height, 21" Length, 12" Width, Series 2-5 horizontal cross, Aluminum, 12" Radius

It is a 12 inch radius fitting. That radius sets the minimum bend the conductors see turning through the intersection, so match it to the cable manufacturer's minimum bending radius before you commit. B-Line builds these crosses in other radii as well, so if your cable calls for a wider sweep, order the larger radius version rather than forcing the pull through a 12 inch turn.

A horizontal cross is the right part when four runs come together at one point in the same horizontal plane, like a four way corridor intersection. Two tees back to back leaves a short straight section between them and two extra splice points, which adds hardware and load transfer joints. The 4A-12-HX12 handles the full four way intersection as a single aluminum piece with a 12 inch radius on the turns. Use a tee only when three runs meet, and a horizontal elbow when the run simply changes direction.

The 4A-12-HX12 weighs 17.866 lb. Aluminum keeps it light enough for a two-man set on a lift, but a cross concentrates load from four directions, so plan trapeze or threaded rod supports on each of the four legs near the fitting rather than relying on the adjoining straight sections to carry it.

This one is aluminum. That makes it a common pick for wash-down areas, coastal sites, water treatment plants and parking structures where plated or painted steel tray tends to rust at cut edges and fastener holes. It is also lighter to handle overhead. Where you need maximum load capacity or a specific fire-resistive steel assembly, a steel tray cross is the alternative.

Catalogued dimensions are 4 inch height, 21 inch length/depth and 12 inch width, with a 12 inch radius. Use the 21 inch figure when you set out where the straight tray sections stop on each approach, and the 4 inch figure for side rail depth clearance under the structure above.

Order splice plates and fastener hardware separately. The cross itself is the fitting; each of the four legs needs a splice connection to the adjoining straight tray section, so that is four sets of splice plates and bolts per cross. Match the splice plate to Series 2-5 aluminum tray so the bolt patterns line up.

Eaton B-Line part number 4A-12-HX12. Reading the number: 4A is the 4 inch aluminum rail, 12 is the tray width, and HX12 is the horizontal cross with a 12 inch radius. That is the designation to put on the submittal and the purchase order.

It carries a CE marking. That is the certification held on record for this fitting; any further project-specific listing should be confirmed against the submittal package for the tray system you are installing.