B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 75 mounting spaces, Top angle style, Seismic Zone 4, open

Yes. The Eaton B-Line SB556108XUTG is built as a Seismic Zone 4 open duct unequal flange rack, so it is intended for installations where the structural authority calls for Zone 4 seismic anchorage. It is also UL Listed. Anchorage to the slab and any overhead bracing still has to follow the engineer's detail for the room.

75 mounting spaces on a frame 108 in high, 19 in wide. That is a taller-than-standard relay rack, which is why the usable space runs above the 45 spaces typical of a 7-foot rack. Plan your panel and patch layout against the 75-space count rather than assuming 45.

The frame is 19 in wide with 12-24 panel mounting holes on the rails, which is the standard thread for 19 inch telecom and network gear. Any panel, shelf, or switch with 19 inch EIA mounting flanges will bolt up using 12-24 screws. If your existing hardware is 10-32, you will need to change screws.

An open rack is a two-post frame with no doors, sides, or top panel. Access is from all four sides, cable runs in and out freely, and heat dissipates without fans, which is why telecom rooms and MDFs use them. The trade-off is no physical security and no dust protection. If the gear sits in a shared or public space, or needs locked access, choose an enclosed cabinet instead. This B-Line unit is the open, top angle style with an unequal flange profile for duct and ladder rack attachment overhead.

The top angle gives you a horizontal flange across the top of the frame to land ladder rack, cable runway, or overhead duct. It is the standard way an open relay rack ties into the room's overhead cable management. If your design routes cable underfloor instead, the top angle simply serves as the frame's top brace.

Steel to ASTM A1011SS, finished in Telco gray powder coat. That gray is the standard telecom equipment color, so the frame will read the same as other Telco gray racks, runway, and cabinets in an existing MDF or IDF rather than standing out.

The frame weighs 33.5 lb. At 108 in tall that is easy enough for two people to walk in and stand up, but the height makes it awkward for one. Note the weight is the empty frame only, so your floor anchors and any seismic detail have to account for the loaded equipment on top of it.