The engineer’s reference desk
937–960 / 1,044 sources
Schneider Electric 2023
Treat DC architecture as an expert-mode option and attach a mandatory protection-study flag
ABB 2026
For loads above roughly 30-50 MW add a grid-code compliance checklist (LVRT duration, frequency band, RoCoF, PF) and let users choose LV-UPS versus MV-UPS architecture.
NFPA 2024
Defaults for white space in NFPA jurisdictions: 1-hour rated walls, 3/4-hour doors and rated fire/smoke dampers at penetrations.
NFPA 2024
When the user selects VEWFD, auto-place aspirating sampling ports at no more than 200 ft2 (18.6 m2) each and check from pipe length that transport time is under 60 s.
NIST / SEMATECH 2012
Make independence and capacity assumptions required inputs of every reliability calculation and keep input provenance.
Open Compute Project Foundation 2019
Use the parameter tables for cold plates, CDUs, manifolds, couplings and pumps as the data sheet checklist when comparing vendor solutions.
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Open Compute Project Foundation 2026
Select size (02-08) by rack or server loop flow: rated flows run from 2.27 to 17.79 L/min; estimate pressure drop from the Cv range and ask for correction or extra testing where the fluid differs from water.
Open Compute Project Foundation 2020
Compare the bill of materials of a server to be immersed (cable jackets, heat-shrink, EPDM capacitors, CMOS battery, relays, thermal paste) against the paper's problem table and obtain a compatibility statement from the fluid supplier for each item.
Open Compute Project Foundation 2026
Base floor and transport-route load checks on the 8,000 lb rack and the 15,000 lb rack-plus-sidecar combination, and include the weight of the moving equipment.
Open Compute Project Foundation 2022
In rack delivery and placement planning, check the 10-degree entry and 15-degree exit ramp angles, the 25.4 mm floor gap and the 4 mm step as rolling limits, and obtain door and shipping dimensions from the rack vendor separately.
Open Compute Project Foundation 2026
Size rack feeds by option: two independent 60 A NEC or 63 A IEC circuits, protection suited to 40 kA available short-circuit current at the tap-box, and no PDU in between.
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.
U.S. DOE FEMP 2010
Choose maintenance strategy by equipment criticality: predictive for critical equipment with random failures, preventive for equipment subject to wear, reactive for small non-critical items; build a master equipment list and priority matrix.
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.
Schneider Electric 2025
Allow an hourly (8760 h) emission-factor profile input in the carbon calculator, falling back to the annual average.
Siemens / NVIDIA 2025
If 800 VDC is selected, require SSCB/hybrid breakers in the protection catalog.
Schneider Electric 2023
Add embodied-carbon parameters to the catalog: kgCO2e per server, per kW of UPS or cooling, and per m2 of building.
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.
The Green Grid (multi-org task force) 2011
Tag every PUE result with a category (0-3) and period; report the design-model PUE as category 3-equivalent annual energy.
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.
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