Open Rack Specification V2, Revision 12 (Facebook part number 06-000060)

Overview

The document aims to be the detailed product specification a rack supplier needs to develop Facebook's implementation of Open Rack V2. Nominal geometry is about 2210 mm tall, 600 mm wide, 1067 mm deep with a 48 mm OpenU height, and detail is tied to mechanical drawing 06-000060. The base frame carries 500 kg of IT gear under the dynamic conditions; with bolt-on members the rack can be converted in the field with hand tools to a heavy configuration carrying 1400 kg. The rack supports two PDUs.

Optional kits can be installed and removed in the field. Side panels prevent air recirculation at the end of a row. The IT support bracket carries 80 kg per set dynamically and 50 kg static on the leading 25 mm; the power shelf bracket carries 50 kg; the EIA-to-OpenU adapter carries 12 kg. The Zone 2 kit links adjacent racks, and a set of three racks tied together must pass the NEBS GR-63 seismic test with an evenly distributed 1400 kg IT load per rack; a single or pair of racks need not comply. The Zone 4 kit is for highly seismic areas. The base configuration has two power zones, and for low-power configurations a strap of two small busbars bridges the lower zone to the upper.

Structural conditions require carrying the rated IT load in shipping (ASTM D4169-09, Assurance Level II, levelling feet raised) and under NEBS GR-63 Zone 2 and Zone 4 (feet lowered). Four levelling feet must raise the casters at least 35 mm, and four 19 mm seismic bolt slots plus three M12 nuts are provided. Movement tests cover a loaded rack rolling over a 6 mm step and a 1 in gap at 0.5 m/s, a 5 degree ramp and at least 800 m on concrete at 0.8 m/s; afterwards the push force must be under 5% of rack plus IT weight. Expected life is 10 years at 65-85 F, maximum 85% humidity and minimum 42 F dew point.

Key points

1. Nominal ORV2 rack geometry: height ~2210 mm, width 600 mm, depth 1067 mm, OpenU pitch 48 mm.
2. The base rack supports 500 kg of IT gear under the dynamic conditions; the bolt-on heavy configuration supports 1400 kg; conversion is possible in the field with hand tools.
3. A set of three racks tied with the Zone 2 kit must pass a NEBS GR-63 seismic test with an evenly distributed 1400 kg IT load per rack.
4. The base rack has 2 power zones; an optional strap of two small busbars bridges the lower zone to the upper zone.
5. Levelling feet must lift the casters at least 35 mm off the floor; the rack provides 4 x 19 mm seismic bolt slots plus 3 x M12 rear nuts.
6. A loaded rack must transition a 5 degree ramp and roll over a 6 mm step per caster at 0.5 m/s; shipping per ASTM D4169-09 Assurance Level II.
7. The rack shall have entry and exit angles of at least 15 degrees.
8. IT support bracket 80 kg per set, power shelf bracket 50 kg and EIA-to-OpenU adapter 12 kg dynamic load.
9. Expected life 10 years; operation 65-85 F, maximum 85% humidity, minimum 42 F dew point; ground points must pass 48 hours of ASTM B117 salt spray.
10. The rack provides a top exit hole above each PDU so an IEC 60309-2 5-pin Type 4 whip connector can pass while connected.

Using it in design

• Add an ORV2 rack catalogue entry (600 x 1067 x ~2210 mm, 48 mm OpenU, 500/1400 kg IT-load ratings) so floor-loading calculators can use the correct footprint and point loads.
• In seismic zones, warn when ORV2 racks are not tied in groups via the seismic kit and anchored at the specified bolt locations.
• Use the 5 degree ramp and 15 degree entry/exit angle limits in delivery-path checks (ramps, dock levelers).
• In handling checks assume a loaded rack crosses a 6 mm step and a 1 in gap at 0.5 m/s and that the push force to start it is under 5% of its total weight.
• In traditional raised-floor halls plan the floor power conduit kit that carries AC cable to the top of the rack, and the top exit hole.
• For legacy ORV2 installations use end-of-row side panels and the hot-aisle containment kit (up to 2206.4 mm above the floor) to prevent air recirculation.

Who should read it

Facility and rack design engineers operating or replacing legacy ORV2 rack installations in colocation or retrofit projects.

Document contents

1. Introduction
2. Goal
3. License
4. Reference Documents
5. Rack requirements
6. Geometry
7. Base Rack Config
8. Heavy Rack Config
9. Optional Rack Kits
10. Side Panel
11. IT support bracket
12. Power Shelf Support bracket
13. EIA to OpenU Rack Adapter
14. Zone 2 Kit
15. Zone4 Kit
16. Dual to single power zone convertor strap
17. Floor Power Conduit
18. Hot-aisle Air Containment
19. PDU Blanking Panel
20. Structure
21. Dynamic Conditions
22. Leveling Feet
23. Seismic Bolt Locations
24. Movement
25. Expected Life
26. Cable
27. Color
28. Electrical
29. Regulatory
30. Revision History

Related standards

• OCP Open Rack V3 Base Specification
• Telcordia NEBS GR-63-CORE
• ASTM D4169

Read the document

Publication details

Authors

Open Compute Project Foundation

Publisher

Open Compute Project Foundation

Year

2015

Document number

06-000060 Rev 12

Document language

English

Source type

Industry body

Access

Open licence — downloadable

Licence

OCPHL-R — OCP hardware licence; redistribution permitted

Licence evidence

www.opencompute.org

Citation