Topic guide
Explore sources on rack layouts, power density and IT equipment interfaces. Review technical notes to understand how mechanical, electrical and cooling requirements meet at the rack level.
169–191 / 191
Open Compute Project Foundation 2022
When choosing the feeding branch circuit, size option 1 for two independent 20 A NEC circuits or option 2 for a 32 A IEC circuit, check the 25 kA available short-circuit current at the outlet, and note there is no PDU in between.
Open Compute Project 2026
Add an '800 VDC (+/-400 V) to rack' electrical topology option: facility rectification upstream, DC busway, and rack HVDC shelves of 100 kW each.
Legrand (Server Technology) 2024
Add busway entries with 40-1,250 A ampacity and tap-off ratings to the electrical catalog; define rack PDU entries at 16-100 A and 208/415/480 V.
Schneider Electric 2020
In the edge template, allow a ventilated enclosure when IT load is 4 kW or less.
Schneider Electric 2026
Offer a 'prefabricated IT pod' option in the white-space designer, with catalog defaults 1.2 MW, 42 racks, 93 m2.
Siemens / NVIDIA 2025
If 800 VDC is selected, require SSCB/hybrid breakers in the protection catalog.
Schneider Electric 2021
In the rack power module, catalogue whip types, compute kW per whip as V x A x sqrt3 x 0.8 (three-phase) or V x A x 0.8 (single-phase), and default each rack to two three-phase whips (A/B).
Schneider Electric 2021
When the project region is IEC, start rack power from 230/400 V, 16 A or 32 A three-phase IEC 60309 whips.
ABB 2025
Mark 800 VDC as an "emerging" distribution option in the electrical catalog and show prerequisites: DC-rated SSCBs, DC busway, grounding scheme choice.
Schneider Electric 2026
In the AI rack template, default to 415/240 V (NA) or 400/230 V (IEC).
ASHRAE TC 9.9 2015
In the zone model, define a thermal class per zone instead of one room setpoint (for example tape room A1/narrow, compute A2/A3).
Cabling Installation & Maintenance 2024
Add an 'edge / micro-edge' project type with a Type A/Type B resilience choice; Type A can justify lower site redundancy because workload fails over
Vertiv 2021
Rule: rack kW > 20 suggests containment plus in-row cooling or rear-door heat exchangers; rack kW > 30-40 recommends liquid.
Uptime Institute 2025
Use PUE 1.54 as the 'industry average' line on the efficiency dashboard, year-stamped and user-overridable
Uptime Institute 2026
Make 30 kW/rack the threshold where the app moves from 'enhanced air' guidance to 'liquid-ready' guidance (rear-door heat exchanger / direct liquid cooling)
Vertiv 2025
Seed an AI-hall wizard template with: compute rack 73 kW, support rack 14 kW, liquid fraction 0.78, power 4N/3, cooling N+1, mechanical UPS 2N.
Vertiv 2024
Provide a "2N AI hall" preset to compare with the 4N/3 preset: 2N makes installed UPS 200% of load against 133% for 4N/3; show the capex and efficiency deltas.
Vertiv 2025
Make the capacity block a first-class object: block = UPS group + PDUs + CDUs + chillers sized for N pods, so no power is stranded.
Vertiv 2025
Implement mechanical UPS sizing explicitly: mechUpsKw = sum of CDU pump kW + CRAH fan kW for every unit that must ride through; default about 20 kW per 1.35 MW CDU (roughly 1.5% of liquid load) and about 17 kW per CRAH.
Vertiv 2025
In the campus planner define the 2,496 kW pod as a repeatable block; when the user picks N blocks, multiply UPS, CDU and chiller counts by the block count.
Vertiv 2024
In the layout engine add 200 mm to rack depth for liquid-cooled AI racks; manifolds and hoses do not fit standard depth.
Open Compute Project Foundation 2023
Write MAWP with at least 3x burst pressure, the 17-65 C operating and -40 to 75 C shipping ranges and the 1.5 m/s velocity limit into the manifold specification; because the range is based on ASHRAE W45, ask suppliers for a higher rating if a warmer-water strategy is planned.
Open Compute Project Foundation 2026
Choose cooling architecture against target rack power and each method's usable envelope: a 45 kW air ceiling (60-80 kW with rear doors), 120-250 kW class cold-plate racks, and the paper's anchor values for announced 600 kW-class racks.
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