B-Line Eaton series imperial cable tray and ladder, 4" Height, 31.692" Length, 12" Width, Series 2-5 vertical inside bend, Aluminum, 30° Angle, 48" Ra

A vertical inside bend changes the elevation of a tray run where the fitting turns toward the inside of the angle, so the tray climbs or drops without breaking the cable path. The Eaton B-Line 4A-12-30VI48 makes that transition at 30 degrees on a 48 inch radius, which keeps the cable bending radius generous for larger power and control cable. If your elevation change turns the other way, you need the matching vertical outside bend instead, not this fitting.

Allow about 31.692 inches of run length for the fitting itself, measured along the tray. That figure is what you subtract from your straight section takeoff when laying out the elevation change on a 48 inch radius. The piece weighs 7.51 lb, so it is a one-man lift and does not change your support loading much, but keep a hanger near each end of the fitting as you would with any tray bend.

Aluminum. That is the usual choice for exterior, wash-down, and coastal or chemical-exposure runs because it does not need galvanizing to resist corrosion, and it keeps the weight down at 7.51 lb for a fitting this size. If your spec calls for pre-galvanized or hot-dip steel tray, this aluminum fitting is not a substitute, since tray fittings have to match the straight section material and finish.

Yes, the fitting carries CSA certification, which is what an inspector on a Canadian project will be looking for on cable tray components.

Eaton B-Line part number 4A-12-30VI48. Reading the code: 4 inch rail, aluminum, 12 inch width, 30 degree vertical inside, 48 inch radius. Splice plates and hardware to join the fitting to the adjoining straight sections are ordered separately, as they are with B-Line tray generally.

Not interchangeably. The radius sets both the cable bending radius through the elevation change and the physical footprint of the fitting, and this one is 48 inch radius taking up 31.692 inches of run. A smaller radius fitting occupies less length but bends the cable harder. If your cable manufacturer's minimum bending radius drove the 48 inch call-out on the drawing, keep it; if the drawing says 12 or 24, that is a different fitting and it will not line up with your dimensioned layout.