B-Line Eaton series open racks, Double sided, 340 lb, Steel, Telco gray powder coat, 12-24 panel mounting holes, 75 mounting spaces, Top angle style,

The Eaton B-Line SB5866138TG is built as a Seismic Zone 4 network bay open duct rack, so it is the right family to quote where the drawing calls for Zone 4 seismic bracing. It is also UL Listed. Anchoring to the floor (and to overhead ladder rack or bracing per the engineer's detail) is what actually develops that rating on site, so follow the seismic detail on the drawing for anchor type and quantity.

The rails are drilled with 12-24 panel mounting holes, so you fasten equipment with 12-24 rack screws. If your patch panels or shelves came with 10-32 or M6 hardware, order 12-24 screws separately, because the wrong thread will strip the rail. There are 75 mounting spaces per side of the bay.

Double sided means the SB5866138TG bay is drilled and usable for equipment mounting from both faces rather than being a single front-mount frame. That is standard practice in a central office network bay, where you land equipment on one side and cabling or termination on the other. It also means you need working clearance front and rear, not just at the front.

Open frame. There are no doors, sides, or top panel on this B-Line bay, so cooling is by ambient room air and cable access is unobstructed on all faces. If you need physical security or dust control for the gear, you need an enclosed cabinet instead of an open rack.

Top angle refers to the angle member across the top of the bay, which is what you use to tie the rack off to overhead cable runway or auxiliary framing channel. In a seismic install that overhead tie is part of how the bay is restrained, so plan the runway height and bracing before setting the rack.

What you are ordering is the open frame bay itself in Telco gray with 12-24 drilled rails. Floor anchors, vertical or horizontal cable management, ladder runway, power strips, and shelves are separate items and should be quoted alongside it so the install is complete on the first trip.

Frame material is ASTM A570 grade 33 steel with a Telco gray powder coat finish. That grey is the standard telecom equipment room color, so it will match existing B-Line bays and cable runway in a typical central office without a color mismatch on the row.