B-Line Eaton series imperial cable tray and ladder, 6" Height, 14.97" Length, 30" Width, 30" and 18" Tray widths, Series 2-5 right reducer, Aluminum

It is a right reducer that transitions a 30 inch wide tray down to an 18 inch wide tray. The offset is on the right side, so one side rail stays in line and the reduction is taken entirely on the other. Height is 6 inches and the fitting measures 14.97 inches in the length/depth direction, so you need that much straight space in the run to drop it in.

Yes. The 6A-30-RR18 is a 6 inch load depth fitting, so it matches 6 inch deep tray on both the 30 inch and 18 inch sides. Pair it with tray of a different rail height and the side rails will not line up at the splice.

Handing matters on a reducer. The 6A-30-RR18 is the right-hand version, meaning the reduction is taken off the right side as you look along the run. If your 18 inch tray needs to stay flush with the left rail, order the left reducer in the same 30 to 18 configuration instead. Getting this backwards leaves the tray offset to the wrong side and the conduit drops land off-center.

Aluminum. That keeps the fitting light at 5.2 pounds, which matters when a single electrician is holding it up on a lift to bolt into an existing run, and it suits corrosive or damp environments better than plain steel. Bolt it to aluminum tray of the same series to avoid mixing dissimilar metals at the splice.

The 6A-30-RR18 is sold as the reducer fitting itself. Splice plates and the bolt-and-nut hardware to join it to the adjoining straight sections are ordered separately, as are any supports or hangers needed at the transition. Plan on a splice connection at both ends of the fitting.

Order Eaton B-Line 6A-30-RR18. The code reads as 6 inch depth, aluminum, 30 inch incoming width, right reducer to 18 inch. That is the full ordering identity for the fitting, no suffixes to add.

It is CE marked. If your submittal package calls out other listings or agency approvals, check those against the project spec before release.