B-Line Eaton series imperial cable tray and ladder, 4" Height, 30" Length, 30" Width, Series 2-5 horizontal cross, Aluminum, 12" Radius

The 4A-30-HX12 is built for 30 inch wide tray, with a 4 inch side rail height. All four legs of the cross match that 30 inch width, so it joins four straight runs of 30 inch aluminum tray at a four-way intersection. If your run is a different width, you need the matching width fitting instead, since the flanges are cut to the tray width.

Yes, it is a Series 2-5 fitting, so it mates with B-Line imperial aluminum cable tray and ladder in that series family at 4 inch rail height and 30 inch width. It is not intended for other series or for a different rail depth.

Aluminum. That keeps the weight down for overhead work (the fitting itself is 19.75 lb) and suits corrosive or wash-down areas better than plain painted steel. Pair it with aluminum tray and aluminum splice hardware so you are not mixing dissimilar metals at the joint.

The 4A-30-HX12 carries CSA certification. That is the listing to cite on a submittal for Canadian work or where the electrical spec calls out CSA-certified tray fittings.

A horizontal cross is a four-way intersection: it joins tray runs coming in from all four sides on the same plane. A tee joins three. The 4A-30-HX12 is the cross, so use it where a main run continues straight through and branches go off both sides at the same point. If only one branch leaves the run, a tee is the correct fitting and the cross leaves you an open fourth leg to cap.

Plan for a 30 inch by 30 inch footprint with 4 inch deep side rails. On a 12 inch radius cross the legs sweep out from the center, so allow clearance on all four sides of the intersection and set your trapeze or support hangers clear of the fitting body rather than under the curved section.

Order the connecting hardware separately. The 19.75 lb shipping item is the cross fitting itself; each of the four legs needs splice plates and bolt sets matched to the aluminum Series 2-5 tray it lands on, so count four splice connections per cross when you build the material list.