B-Line Eaton series imperial cable tray and ladder, 4" Height, 18.44" Length, 30" Width, 30" and 12" Tray widths, Series 2-5 right reducer, Aluminum,

A right reducer narrows a tray run off to one side, keeping one side rail straight while the other angles in. The B-Line 4A-30-RR12 takes a 30 inch wide tray down to a 12 inch wide tray, so the reduction all happens on one side rather than being split evenly like a center reducer. Use it where the run has to stay flush against a wall, a cable riser, or an equipment line on the straight side.

Plan on 18.44 inches of run length for this fitting. It is built on a 12 inch radius, which is what sets that overall length, so the cable bend inside the reduction stays within a 12 inch sweep. Deduct the 18.44 inches from your straight-section takeoff when you lay the run out.

Yes, the 4A-30-RR12 reducer is UL Classified, which is the listing an electrical inspector looks for when cable tray is used as a support system and as an equipment grounding path. Keep the fitting, splice plates, and adjoining straight sections all within the same classified system so the run stays compliant end to end.

No. Flipping a right reducer upside down puts the rungs on the wrong face, so order the left-hand version instead. Right and left are separate part numbers in the Series 2-5 line. The part for the right-hand reduction from 30 inch to 12 inch at 4 inch depth is 4A-30-RR12.

Cable has a minimum bend radius, and on a reducer the conductors have to sweep across as the tray narrows. This fitting is a 12 inch radius piece, so the cables track a 12 inch sweep through the reduction. If your largest cable calls for a tighter allowance than that you are fine; if it needs more than 12 inches, step up to a larger radius fitting rather than forcing the pull through this one.

Aluminum. That keeps it light at 5.377 lb for a 30 inch wide fitting, which matters when you are working off a lift and setting fittings overhead, and aluminum is the usual choice where corrosion is a concern rather than plated steel. Keep the whole run in the same material so you are not mixing aluminum and steel at the splice plates.

The 4A-30-RR12 is the reducer fitting itself. Splice plates, hardware, and any supports at the transition are ordered separately, so count two splice connections for this piece, one at the 30 inch end and one at the 12 inch end, and size the plates to a 4 inch deep aluminum rail to match.

Order Eaton B-Line 4A-30-RR12. Reading the number: 4 inch loading depth, aluminum, 30 inch incoming width, right reducer at a 12 inch radius. That is the part number to put on a submittal or a purchase order for this transition.