B-Line Eaton series open racks, Steel, Yellow zinc finish, 12-24 panel mounting holes, 58 mounting spaces, Top channel style, Seismic Zone 4, network

It is a 19 inch wide rack with 58 mounting spaces, so it takes standard 19 inch rack mount network and telecom gear and gives you 58 rack units of usable panel height. That is why the height runs to 138 inches.

The rails are tapped with 12-24 panel mounting holes, so you fasten equipment and patch panels directly with 12-24 machine screws. No cage nuts and no square hole hardware. If your patch panels and switches shipped with M6 or 10-32 hardware, order 12-24 screws separately.

The SB5773138YZ is built as a Seismic Zone 4 network bay closed duct rack, Zone 4 being the most severe of the legacy seismic zones and the one that covers most of coastal California. It is also UL Listed. Anchorage to the slab and any overhead bracing still have to follow the engineer of record's detail for your building.

Closed duct refers to the vertical cable duct being enclosed rather than open along its length, so jumpers stay captive in the pathway instead of spilling out of the rack face. It is the arrangement used on network bays where a lot of cross connect cable is dressed vertically. A plain open rack with open trough runs cheaper and is easier to drop cable into midspan, but it does not contain and protect the bundle the same way.

It weighs 136 pounds bare, and at 138 inches long it is an awkward two or three person lift to walk in and stand up. Plan on a mechanical assist or a rigging crew in a tight closet, and confirm your floor loading with the equipment weight added on top.

Top channel is the style of this rack, giving you a channel section across the head of the frame, which is the member used to join adjacent bays into a lineup and to tie off to auxiliary framing and overhead runway. Runway, brackets and anchors are separate items and are not part of the rack.

The frame is steel with a yellow zinc finish, which is a plated corrosion finish rather than a decorative paint. It is standard for telco and central office bays and grounding continuity, but it will not match a black painted equipment room aesthetic. For a lobby or client visible space you would want a black finished rack.

Order Eaton B-Line part number SB5773138YZ. That number covers the 19 inch, 138 inch tall, 58 space network bay rack in yellow zinc with 12-24 tapped rails.