B-Line SB5878140UTG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 77 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack, 11 gauge, ASTM A1011SS

The SB5878140UTG gives 77 mounting spaces on a frame that stands 140 inches tall. That is a tall network bay, so check your ceiling height, cable tray elevation and sprinkler clearance before you commit to it. The mounting rails are drilled 12-24 tapped panel mounting holes, so panels and equipment ears fasten directly with 12-24 screws without cage nuts.

Yes. The SB5878140UTG is built as a Seismic Zone 4 network bay closed duct rack, and it is UL Listed. The frame is 11 gauge steel to ASTM A1011SS. For a seismic install the rack still has to be anchored to the floor and braced overhead per your structural drawings; the rack rating does not cover the anchorage design.

No cage nuts. The mounting rails carry 12-24 panel mounting holes, which is the tapped-thread telco standard, so equipment mounts with 12-24 machine screws straight into the rail. If your gear was bought for a square-hole EIA cabinet, you will be reusing the hardware, not the cage nuts.

An open frame rack such as the SB5878140UTG is the choice for telco and network bays where every patch panel, switch and cable run needs to be reachable from both sides and cooling comes from the room. It gives no physical security and no dust or airflow containment. If the equipment sits in a shared or public space, or you need locking front and rear doors and directed airflow, specify an enclosed cabinet instead. This one is a closed duct network bay style with a top channel for overhead cable support and raceway.

Telco gray powder coat over steel, which is the standard color used across central office and network bay equipment, so it will read the same as existing telco-gray racks in a room. Only the one model is offered, SB5878140UTG, so there is no alternate color to specify.

The frame is 11 gauge steel meeting ASTM A1011SS, which is the structural sheet grade B-Line uses on its seismic-rated bays rather than a light commercial gauge. Combined with the Seismic Zone 4 construction, it is built for a full column of switches and patch panels on a 140 inch bay. Load still has to be distributed and the rack anchored top and bottom.

The top channel style gives you a structural member across the head of the bay to attach overhead ladder rack, cable runway and bracing to. On a Seismic Zone 4 installation that top channel is also where the overhead sway bracing ties in, which is why a bay this tall is specified with one rather than a plain open top.