Open Rack V3 High Power (60A) AC WHIP Power Cable Design Specification, Revision 1.1.0 (11 November 2026)

Overview

The specification defines a custom 60 A AC whip for Meta's Open Rack V3 HPR V2 (high power rack). The whip accepts 3-phase WYE wiring (4 wires plus ground) and delivers AC power to the ORV3 HPR V2 72 kW power shelf. The assembly consists of an IEC 309 connector, individually jacketed 6 AWG cables, a custom overmolded 5-pin input connector (right-angle or straight exit) and, if needed, an overmolded junction box with a 5-conductor power cord. The whip comes in two lengths to suit power shelf positions in the rack: 2000 mm for the top position (OU37-42) and 4500 mm for the bottom (OU3-8).

Two WYE variants are defined. North America: 277/480 VAC, 60 A NEC assembly with an IEC 309 Series II plug, nominal maximum continuous current of 60 A per phase (48 A after 80% derating), earth pin at 210 degrees / 7h and no IP67 cover needed. EU: 200-240/346-415 VAC, 63 A IEC assembly with an IEC 309 Series I plug, 63 A per phase, earth at 180 degrees / 6h. In North America the individual conductors are Type W 6 AWG 1C or the recommended UL 2137 silicone-rubber 6 AWG for better flexibility; in the EU they are 10 mm2 H07RN-F, all rated 90 C or higher. Expandable sleeves about every 200-300 mm help cable routing.

There are two ways to converge the conductors: an overmolded junction box (UL 94 V-0, at least 105 C, rated 60 A continuous, at most 80 x 50 x 120 mm) or, preferred for simplicity, routing directly into the IEC connector with a purpose-made strain relief. The North American cord is Type W 6 AWG 5C and the EU cord H07RN-F 5G10 (16 mm2 recommended, 10 mm2 acceptable if requirements are met). The connector must carry the label 'Not for current interrupting. Do not hot plug.' on both faces.

The compliance section requires the assembly to be UL Listed per UL 817, with parts certified to UL 1682 (IEC 309 connector), UL 1977 (power shelf connector), UL 62/UL 758 and EN 50525, plus CE marking. Tests include a cord pull of 100 N x 1 s x 25 times (conductor displacement at most 2 mm), 5000 VDC dielectric strength for at least 90 s, 25 insertion cycles, contact temperature rise not above 30 C, 100% production hi-pot (1500 VAC rms or 2121 VDC) and a polarity test. The operating environment is -40 to +90 C, 10-90% RH and 3000 m without derating. That one whip per 72 kW shelf implies large rack tap-offs is an engineering inference, not a statement in the document.

Key points

1. Feeds the ORV3 HPR V2 72 kW power shelf; two whip lengths cover different shelf positions: top (OU37-42) 2000 mm, bottom (OU3-8) 4500 mm.
2. Variants: 277/480 VAC 60 A NEC assembly with IEC 309 Series II plug (North America); 200-240/346-415 VAC 63 A IEC assembly with IEC 309 Series I plug (EU).
3. Output uses a 5-pin power-shelf connector matching the 72 kW shelf AC input (WYE wiring); gold-plated 5 mm pin and socket contacts.
4. Conductors individually jacketed and rated 90 C or higher: NA Type W 6 AWG 1C or UL 2137 silicone 6 AWG (preferred); EU 10 mm2 H07RN-F.
5. NA Series II input: 60 A per phase nominal continuous (48 A after 80% derating), earth at 7h (210 degrees); EU Series I: 63 A per phase, earth at 6h; no IP67 cover needed.
6. Assembly must be UL Listed per UL 817 and CE certified; parts to UL 62/UL 758; connectors tested to IEC/EN 61984 and IEC 60512.
7. Overmolded junction box: UL 94 V-0, at least 105 C, 60 A continuous, at most 80 x 50 x 120 mm; direct routing into the IEC connector is preferred.
8. Cord pull test 100 N x 1 s x 25 times plus 0.25 N-m torque; conductor displacement at most 2 mm; dielectric strength 5000 VDC for at least 90 s.
9. Pin-socket contact temperature rise at maximum current must not exceed 30 C; 100% production hi-pot at 1500 VAC rms or 2121 VDC.
10. Operating environment -40 to +90 C, 10-90% RH, 3000 m without derating; connector label 'Not for current interrupting. Do not hot plug.' is mandatory.

Using it in design

• Add a high-power ORV3 feed type (60 A 480 V / 63 A 400 V IEC 60309) to the busway/receptacle catalogue and size each whip at 48 A continuous in North America for power-shelf capacity checks.
• One 72 kW shelf per whip may require large rack tap-offs and selective protection; address this separately in the protection study.
• Flag mismatches between rack design power and whip and power shelf ratings.
• Include 6 AWG / 10 mm2 cord routing, the right-angle or straight exit option and the 2000 mm / 4500 mm whip lengths in rear-of-rack clearance checks.
• Put UL 817 Listed and CE, UL 1682/UL 1977/UL 62 part certificates, 100% hi-pot and polarity testing and T-rise and pull test reports in the procurement specification.
• Reflect the connector's 'not for current interrupting, do not hot plug' warning in operating procedures and forbid unplugging the whip under load.

Who should read it

Electrical engineers designing AC feeds for high-power ORV3 HPR racks, cable and connector manufacturers and rack integrators.

Document contents

1. License
2. Scope
3. Overview
4. Electrical
5. Basic Functional Schematic
6. Output Connection
7. Power Shelf Connector
8. Output Polarity
9. Cabling
10. Individual Conductors
11. Conductor Convergence - Option 1: Overmolded Junction Box
12. Conductor Convergence - Option 2: Direct to IEC Connector
13. Input
14. IEC 309 Series II
15. IEC 309 Series I
16. Mechanical
17. Cable Lengths
18. Cable Exit from Housing
19. Safety Warning Label
20. Assembly Label
21. Regulatory Compliance Approvals
22. Agency Approval
23. Safety Design Considerations & Testing
24. Production Line Test
25. Environmental Regulations & Requirements
26. Reliability, Quality, Miscellaneous
27. Mechanical Drawings

Related standards

• OCP Open Rack V3 HPR V2 72kW Power Shelf
• IEC 60309
• UL 817
• IEC 61984

Read the document

Publication details

Authors

Alisa, M. (Meta)

Publisher

Open Compute Project Foundation

Year

2026

Document number

Rev 1.1.0

Document language

English

Source type

Industry body

Access

Open licence — downloadable

Licence

OWFa 0.9 — Open Compute open specification licence; redistribution permitted

Licence evidence

www.opencompute.org

Citation