B-Line Eaton series open racks, Steel, Yellow zinc, 12-24 panel mounting holes, 50 mounting spaces, Top angle style, Seismic Zone 4, closed duct uneq

The SB5769084YZ gives 50 mounting spaces on an 84 inch tall frame, so you have 50U of usable panel height for switches, patch panels and shelves. Rails are drilled 12-24, which is the thread most network and telecom panel hardware uses.

This B-Line rack is drilled and tapped 12-24, not 10-32. Equipment with slotted or clearance mounting holes drops straight on with 12-24 screws; if your existing hardware kits are 10-32, order 12-24 screws and cage-free washers to match the rack instead of trying to force the smaller thread. Nothing about the rail spacing changes, only the screw thread.

Yes. The SB5769084YZ is built as a Seismic Zone 4 closed duct unequal flange rack, which is what you specify for the highest seismic design category openings in a data or telecom room. It is also UL Listed. Seismic performance depends on the rack being anchored to the slab per the engineer's detail, so the floor anchors and any top bracing are separate items from the frame itself.

Footprint works off a 23 inch width and 84 inch length/depth dimension, with an 84 inch height. Plan the aisle clearance on top of that for cabling and service access at both the front and rear.

Unequal flange means the two legs of the channel are different widths, which gives a deeper face for panel mounting and a closed duct section behind it for running and protecting cable vertically inside the upright. Choose it where you want cable managed within the rack structure and where a seismic rating is required. An equal flange or plain open channel rack is the simpler choice when cable is being carried on separate vertical managers or ladder rack overhead and no seismic rating is called for.

Yellow zinc over steel is a plated finish intended for dry indoor service, which is where an open frame telecom rack belongs. For exterior, wash-down or corrosive environments, specify an enclosed cabinet with an appropriate NEMA rating rather than a plated open rack.

The frame weighs 118 lb. That is a two-person set at 84 inches tall, both for handling and for holding it plumb while the base anchors go in.

Top angle refers to the angle member across the top of the uprights. It ties the two rails together at the head and gives you a surface to land overhead ladder rack, runway or top bracing. It is what you want when cable is coming in from above rather than up from a floor trough.