B-Line SB5779138TG Eaton series open frame racks, Steel, Telco gray powder coat finish, 12-24 panel mounting holes, 75 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack, ASTM A1011SS steel

Yes. The SB5779138TG is built as a Seismic Zone 4 network bay closed duct rack, so it is intended for the highest seismic zone classification used for equipment anchorage. It is also UL Listed. Anchor it per the structural drawings for the job, since seismic performance depends on the floor attachment as much as the frame.

There are 75 mounting spaces on the SB5779138TG, on rails punched with 12-24 panel mounting holes. That is a tall bay, 138 inches overall height, so plan on ceiling clearance and overhead cable runway height before you commit to it in a closet or small equipment room.

The rails are punched with 12-24 panel mounting holes, which is the threaded telco standard, not square-hole EIA cage nut prep. Order 12-24 rack screws and make sure your patch panels, switch brackets and shelves are drilled for 12-24 rather than 10-32 or M6.

Width is listed at 23 inches and depth at 138 inches, with a 138 inch height. Weight of the rack itself is 136 lb. Confirm your aisle and clearance allowances against those numbers before laying out a row of bays.

A closed duct bay integrates vertical cable duct into the frame structure, so jumpers and cross-connects are routed inside the channel rather than cable-tied to the outside of open channels. That is what you want for high density copper cross-connect and telco distribution work. If you are just mounting a few switches and a UPS and want the cheapest footprint, a plain open two-post relay rack is simpler. The SB5779138TG is the closed duct version, top channel style, so it also expects overhead runway support.

Yes, top channel style is the configuration intended to be braced to overhead ladder runway or a wall or ceiling kit. On a 138 inch bay in a Zone 4 installation, that top bracing plus a bolted floor anchor is how the rack gets its stability. Budget for runway, top-of-rack brackets and floor anchors as separate line items.

Yes. The SB5779138TG is a 23 inch wide telco bay with 12-24 punched rails, the standard network bay arrangement that accepts standard rack-mount panels and equipment. Watch the hole thread: panels drilled for 10-32 will not take 12-24 screws.

The SB5779138TG is finished in telco gray powder coat, the standard color used across B-Line telco bays, runway and cable management. It will read the same as other telco gray B-Line gear in the room. It will not match black or white powder coat frames.

Frame material is steel to ASTM A1011SS, a hot-rolled structural sheet and strip specification, finished in powder coat. That is the grade B-Line uses on its structural telco bays, and it is what the seismic rating is calculated against.