B-Line Eaton series imperial cable tray and ladder, 4" Height, 66" Length, 36" Width, 36" and 18" Tray widths, Series 2-5 horizontal cross, Aluminum,

Model 4A-36-18-HX12 is built for a 36 inch run crossed by 18 inch widths, so it joins 36 inch and 18 inch cable tray in a four-way horizontal intersection. The fitting's own width is 36 inches and it carries a 12 inch inside radius on the turns. If your branch runs are a different width, this is the wrong fitting, cross fittings are made to the specific width combination.

Allow for a fitting that runs 66 inches in length and 36 inches across, at 4 inches deep. That 66 inch dimension is what catches people out on a congested ceiling, a 12 inch radius cross projects well past the nominal tray width on each leg, so lay it out before you set your trapeze supports.

Bend radius is the whole point of buying a radiused fitting instead of a square one. The 12 inch inside radius on this cross gives large power and data cables a gentle sweep through the intersection, which keeps you inside the manufacturer's minimum bend radius for the cable and avoids crushing or kinking at the turn. If your cable schedule calls for a bigger radius than 12 inches, order the larger radius version of the fitting.

It is aluminum. That makes it a lighter fitting to hang overhead (22.77 lb) and it holds up better than plain steel in damp or corrosive areas such as water treatment, food plants and coastal sites. Keep the system consistent, mix aluminum fittings into galvanized steel tray and you introduce a dissimilar metal joint plus a bonding headache.

The 4A-36-18-HX12 is supplied as the cross fitting itself. Splice plates, connector hardware and the supports at the intersection are ordered separately and need to match the Series 2-5 aluminum tray system you are building, so add those to the same order if you are not pulling them from van stock.

Use the cross where four tray runs meet at one point, it is a single fitting that carries the cables through the intersection on a 12 inch radius with no extra splices. Two tees back to back only works when the branches are offset along the run, and you end up with more splice joints, more support points and a short filler piece between them. For a true four-way junction of a 36 inch run and 18 inch branches, the cross is the correct part.

Order Eaton B-Line part number 4A-36-18-HX12. Reading the number: 4A is 4 inch aluminum, 36-18 is the 36 inch main and 18 inch branch widths, HX is horizontal cross and 12 is the 12 inch radius.

22.77 lb. Light enough for one installer to lift into a hanger, though at 66 inches long by 36 inches wide it is awkward to handle solo on a lift, most crews set it with two.

CE marked. That is the certification stated for this fitting, useful if you are supplying a project or an OEM package where CE documentation is required in the submittal.