B-Line Eaton series imperial cable tray and ladder, 4" Height, 25.38" Length, 36" Width, 36" and 6" Tray widths, Series 2-5 left reducer, Aluminum

A left reducer is the transition fitting you drop in where a wide tray run steps down to a narrower one. Eaton B-Line model 4A-36-LR06 goes from a 36 inch tray width to a 6 inch tray width, with the offset taken on the left side so the left side rail stays in a straight line and all of the width change happens on the right. Use it where cables drop off the main run and the remaining bundle only needs a narrow tray, and where you want one side rail to hold a continuous line along a wall or ceiling.

It mates a 36 inch wide tray on the large end to a 6 inch wide tray on the small end, and it is 25.38 inches long through the transition. The rail height is 4 inches, so it lines up with 4 inch deep ladder tray on both sides of the joint. If your run steps from 36 down to something other than 6 inches, this is not the fitting for that joint.

The 4A-36-LR06 reducer is aluminum, so it is built to splice into an aluminum B-Line ladder run of matching 36 inch and 6 inch widths at 4 inch rail height. Mixing aluminum fittings into a galvanized or stainless steel run brings in dissimilar metal contact at the splice and bolt holes, and the rail sections are not interchangeable between material lines. For a steel run, order the reducer in the same material and finish as the straight sections.

It depends on which side rail you need to keep in line. A left reducer keeps the left rail straight and pulls the right rail in, which is what you want when the tray is running tight along a wall, a column line, or a cable riser on the left. A right reducer does the mirror image. A straight or center reducer splits the width change evenly on both sides and centers the small tray on the large one, which suits a run suspended in open space where both rails can move. The 4A-36-LR06 is the left-hand version, stepping 36 inches down to 6 inches.

The B-Line 4A-36-LR06 reducer carries CSA certification, which is what an inspector on a Canadian project will look for on the fitting as well as on the straight tray sections. Keep the certification listing in your submittal package along with the tray run it splices into.

Plan on splice hardware as a separate line. What you are buying with 4A-36-LR06 is the aluminum reducer section itself, 25.38 inches long, transitioning 36 inch tray to 6 inch tray at 4 inch rail height. Each end still has to be spliced to the adjoining straight section, and the transition normally wants a support close to the joint, so add splice plates, bolt sets, and a hanger or bracket to the same order to finish the run.

Order Eaton B-Line part 4A-36-LR06. That is the aluminum Series 2-5 left reducer, 4 inch height, 36 inch large end to 6 inch small end, 25.38 inches long. Adjacent numbers in the same family change the small-end width or the hand of the offset, so the LR06 suffix is the detail that matters when you quote it.