Middle Atlantic 24SP/27D WRK Rack LRD - WRK-24SA-27LRD

Middle Atlantic WRK-24SA-27LRD 24RU Seismic-Rated Open-Frame Rack

Overview

The Middle Atlantic WRK-24SA-27LRD is a 24-rack-unit, 27.63-inch-deep open-frame floor rack designed for security integrators and IT architects who need a structurally verified, seismic-rated enclosure for NVRs, servers, patch panels, and AV equipment in commercial and government installations. At 48.13 inches tall and 24.25 inches wide, it fits tightly in most telecom closets and equipment rooms while delivering a 2,500 lb UL-listed seismic load capacity — a figure that matters when the local AHJ requires ASCE 7-10 compliance documentation at project closeout.

Built and sourced in the USA, the WRK-24SA-27LRD carries TAA compliance, making it eligible for federal, state, and local government procurement without a waiver. If your project involves a government facility or a TAA-required contract vehicle, this rack clears that gate cleanly.

Key Features

• 24 Rack Units / 42-Inch Usable Height: 24RU of mounting space translates to 42 inches of usable height — enough room for a full NVR stack, PoE switch tier, patch panel, and UPS without forcing a second rack. Reduces floor footprint in tight IDF closets.
• 2,500 lb UL-Listed Seismic Load Capacity (ASCE 7-10): The UL seismic listing under ASCE 7-10 is not a marketing rating — it is a third-party verified structural certification. Jurisdictions in seismic zones (California, Pacific Northwest, New Madrid corridor) increasingly require this on permit drawings. The WRK-24SA-27LRD can be cited by name on the submittal.
• 10,000 lb Static Weight Capacity: The 10,000 lb static load rating means the rack structure itself is not the limiting factor in any realistic equipment configuration. Stack high-density NVRs, drives, and managed switches without worrying about frame deflection.
• 27.63-Inch Total Depth / 25.75-Inch Usable Depth: The 25.75-inch usable depth accommodates full-depth 1U and 2U servers, high-density NVRs, and deep UPS units that often cannot fit in shallower open-frame racks. The extra clearance behind the rails also keeps cable management from compressing airflow paths.
• 19-Inch Panel Width / 10-32 Rack Rail Threading: Standard 19-inch EIA panel width with 10-32 threaded rails means all commercial-grade security and IT equipment mounts without adapter kits. 10-32 threading accepts standard rack screws and cage nuts — no proprietary hardware needed on the jobsite.
• Open-Frame Design (No Rear Door): The open rear configuration simplifies cable routing from the back of NVRs and switches, reduces heat buildup without forced air, and allows integrators to dress runs cleanly without working around a hinged door. If your environment requires physical security of the rack contents, plan for a separate enclosure or lockable side panels.
• TAA Compliant / Made in USA: Federal Ops Country of Origin is USA. TAA compliance is verified for this SKU — usable on GSA Schedule, cooperative purchasing contracts, and projects with Buy American or TAA requirements without additional documentation.
• 136 lb Shipping Weight: At 136 lbs shipping weight, the WRK-24SA-27LRD ships freight. Plan for liftgate delivery or dock access on installation day. Two-person installation is standard for a rack this size.

Integration & Compatibility

The WRK-24SA-27LRD is built around the universal 19-inch EIA standard with 10-32 threaded rails, so it accepts equipment from any manufacturer without adapter rails or conversion kits. It integrates directly into Middle Atlantic's broader accessories ecosystem — cable management panels, shelves, blanking panels, and PDUs mount using standard 10-32 hardware. For network video recorders, the 25.75-inch usable depth comfortably fits most 1U and 2U enterprise NVR chassis from Axis, Hanwha, Bosch, and i-PRO without depth conflicts. Pair with a managed PoE switch in the same rack to keep the camera network consolidated. If you are sizing the rack for a surveillance head-end, review our rack planning and NVR storage guide to calculate RU requirements before ordering.

Frequently Asked Questions

Q: Is the WRK-24SA-27LRD TAA compliant?

A: Yes. The WRK-24SA-27LRD is TAA compliant and manufactured in the USA (Federal Ops Country of Origin: USA), making it eligible for federal, state, and local government procurement on TAA-required contracts.

Q: What is the seismic rating on the WRK-24SA-27LRD?

A: The WRK-24SA-27LRD carries a UL-listed seismic load capacity of 2,500 lbs (1,134 kg) per ASCE 7-10. This is a third-party verified UL certification, not a manufacturer self-rating, and can be cited on permit submittals for seismic-zone installations.

Q: How many rack units does the WRK-24SA-27LRD provide?

A: It provides 24 rack units (RU) of mounting space, with 42 inches (106.7 cm) of usable height between the rails.

Q: What is the usable depth of the WRK-24SA-27LRD?

A: The usable depth is 25.75 inches (65.4 cm). Total external depth is 27.63 inches (70.2 cm). This depth accommodates full-depth 1U and 2U servers, NVRs, and most enterprise UPS units.

Q: Does the WRK-24SA-27LRD have a rear door?

A: No. The WRK-24SA-27LRD is an open-frame rack with no rear door. This simplifies cable routing and airflow but does not provide physical enclosure of the rear of installed equipment.

Q: What rail thread type does the WRK-24SA-27LRD use?

A: The rack rails are 10-32 threaded, the standard for commercial IT and AV equipment. Standard 10-32 rack screws and cage nuts are compatible — no proprietary hardware required.

Jerry Tildsen

The spec I keep coming back to on the WRK-24SA-27LRD is the UL-listed 2,500 lb seismic load capacity under ASCE 7-10. On government and healthcare projects in California or the Pacific Northwest, the AHJ will ask for seismic documentation at rough-in inspection — having a UL-certified rack that maps directly to the ASCE 7-10 standard closes that conversation without a special engineering submittal.

Technical Highlights:

• ASCE 7-10 Seismic Certification: UL-listed at 2,500 lbs seismic load — third-party verified, not a self-declared rating. Acceptable to most AHJs in high-seismic zones without additional PE stamp.
• 25.75-Inch Usable Depth: Deep enough for full-depth NVR chassis and enterprise UPS units that routinely exceed 24 inches. Shallower open-frame racks force awkward overhangs or rear cable conflicts on these devices.
• 10,000 lb Static Capacity: The static frame rating is effectively unlimited for any realistic security head-end build — the rack will never be the structural weak point, even with a fully loaded NVR array and drive expansion shelves.

Deployment Considerations:

• At 136 lbs shipping weight, this rack ships freight-only — confirm liftgate or dock access before the delivery date, especially on retrofit projects in occupied buildings where loading dock access is restricted.
• The open-frame design has no rear door, which is a real limitation in any space where physical access to the back of the rack needs to be controlled. Plan for a secure room or a separate locking enclosure if that is a requirement on your project.

The WRK-24SA-27LRD is the right call for a government or healthcare surveillance head-end where TAA compliance and a verifiable seismic rating are hard requirements on the project spec sheet — not a nice-to-have, but a go/no-go criterion at closeout.