B-Line Eaton series imperial cable tray and ladder, 4" Height, 27" Length, 18" Width, Series 2-5 vertical tee down, Aluminum, 24" Radius

24 inch radius. That radius is what protects the cable from being bent tighter than its allowable minimum bending radius as it turns down out of the tray. Large power and medium voltage conductors typically need the larger radius fittings; smaller control and instrumentation cable can often use a tighter radius fitting. Keep the radius consistent across a run so fittings and straight sections line up.

Aluminum. Aluminum tray fittings are commonly specified where weight matters or where a plain steel tray would corrode, such as damp, coastal, or chemically aggressive indoor areas. It also means the fitting is significantly lighter to hoist than an equivalent steel part, at 18.9 lb for this tee. Note that aluminum and steel tray systems are not mixed within a run.

18.9 lb, with an overall length of 27 inches. That weight is a one-man lift, but the 27 inch length plus the downward leg means you want a support point close to each end where the fitting splices to straight tray, and you should account for the concentrated fitting weight plus cable fill when spacing your trapeze or wall bracket supports.

It carries CSA certification, which is what an inspector on a Canadian project will look for on tray and tray fittings. That is the only marking recorded for the 4A-18-VT24.

Order by Eaton B-Line part number 4A-18-VT24. Reading it out: 4 inch rail height, A for aluminum, 18 inch width, VT24 for vertical tee with a 24 inch radius. Width, radius, and material all change the number, so confirm those three against the tray schedule on the drawing before you release the order.