B-Line Eaton series imperial cable tray and ladder, 4" Height, 28.0625" Length, 18" Width, Series 2-5 horizontal bend, Aluminum, 30° Angle, 36" Radius

Allow for a fitting with a 36 inch inside radius that turns the run 30 degrees. The 4A-18-30HB36 measures 28.0625 inches on its length/depth dimension, so that is the envelope to reserve between the two straight sections at the turn. The long 36 inch radius is what keeps the cable bend radius generous for large-diameter power feeders rather than forcing a tight pull.

The 4A-18-30HB36 horizontal bend is UL Classified. That is the designation cable tray carries as an equipment grounding conductor under the NEC when properly bonded, and it is the marking an inspector looks for on the fitting as well as the straight tray.

A 30 degree horizontal bend handles a shallow directional change, the kind you get routing around a column line or following a building offset where a 45 would overshoot. Two 30s back to back also give you a jog without the space a 90 demands. The 4A-18-30HB36 turns 30 degrees on a 36 inch radius, which is a sweeping turn rather than a tight corner, so it suits runs carrying heavy feeders that need a long bending radius.

The 4A-18-30HB36 is the bend section only. You will still need splice plates and hardware at each end to tie it to the adjoining straight tray, plus support hangers or trapeze steel on both sides of the fitting. Match the splice hardware to Series 2-5 aluminum tray so the rail profile and bolt pattern line up.

4A-18-30HB36 from Eaton B-Line. Reading the number: 4A is the 4 inch aluminum rail, 18 is the tray width, 30HB is the 30 degree horizontal bend, and 36 is the radius in inches.

Aluminum is the common choice for damp, outdoor, and mildly corrosive industrial environments because it does not need galvanizing to resist rust. The 4A-18-30HB36 is aluminum throughout. For heavy chemical exposure, fiberglass tray is the usual alternative, and for interior dry runs where cost drives the decision, steel is normally specified instead.