B-Line Eaton series imperial cable tray and ladder, 4" height, 115.05" length, 42" width, Series 2-5 horizontal bend, 90°, 36" radius, Aluminum

Plan for the full footprint, not just the tray width. The bend turns 90 degrees on a 36 inch inside radius and the fitting measures 115.05 inches overall in its longest dimension, with a 42 inch tray width. Lay that out against your ceiling or rack obstructions before you set hangers, because a 36 inch radius fitting needs considerably more clearance at the corner than a short-radius bend.

The 4A-42-90HB36 bend is UL Classified. On aluminum cable tray, that classification is what lets the tray system be used as an equipment grounding conductor under the NEC, provided the run is bonded and sized per code. Keep the bolted splice connections clean and tight through the bend so continuity holds across the fitting.

It is aluminum. That keeps the fitting light (29.898 lb for a 42 inch wide, 90 degree bend, which is a one or two man lift instead of a rigging job) and gives it better corrosion resistance than plain painted steel in damp, coastal, or wash-down areas. Aluminum tray is also non-magnetic, which matters on runs carrying single-conductor power cable.

Order Eaton B-Line part number 4A-42-90HB36. Reading the number: 4A is the 4 inch aluminum rail, 42 is the tray width, 90HB is the 90 degree horizontal bend, and 36 is the radius. That is the Series 2-5 aluminum ladder fitting.