Power and UPS

Technical guidePDF

Open Compute Project Foundation · 2026

Introducing Power Compute Effectiveness (PCE), a Provisioned Capacity Allocation Metric for the New Data Center Era (October 2026)

Compute PCE automatically from the design model: utility/transformer capacity as P_facility, peak cooling electrical input at design ambient, UPS/transformer/busway losses and auxiliary panel loads, all on the declared redundancy basis.

• Motor horsepower converts at HP x 0.746; kVA ratings convert to kW at the declared power factor.

Performance metricsElectricalEnergy

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Technical guidePDF

International Energy Agency · 2026

Key Questions on Energy and AI (World Energy Outlook Special Report)

For on-site generation sizing, when users choose islanded or behind-the-meter gas, apply an N+x overbuild check (30-70% above load per IEA) and model BESS for AI power swings.

• AI server power density rose 11 times in 2020-2025 and rises a further four times by 2027.

EnergyElectricalRacks

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Technical guideFree to read

Consulting-Specifying Engineer · 2024

Know specific, unique applications of generators in mission critical facilities

Generator catalogue entries need kW/kVA at 0.8 PF plus derating inputs; the tool should auto-derate for site altitude and design ambient.

• Emergency systems require selective coordination (NEC 700.30).

GeneratorsElectricalCommissioning

Technical guideFree to read

Consulting-Specifying Engineer · 2026

Know the electrical, power components in a data center

Seed facility-type templates with default UPS/generator redundancy and fuel autonomy from Table 1.

• Generators should be loaded to at least 30% to avoid wet stacking.

ElectricalUPSGenerators

Technical guideFree to read

Uptime Institute Journal (Uptime Institute) · 2021

Learning from the OVHcloud data center fire

Separate UPS and battery rooms with fire-rated barriers.

• NFPA 75 and NFPA 76 are the related standards.

Fire safetyUPSSite planning

Technical guideFree to read

Legrand · 2026

Leveraging Intelligent PDUs and Monitoring: Rack Power Solutions for Modern AI Applications

In the rack-power calculator, offer inlet presets (voltage, amps, plug), apply 80 % continuous derating and show kW per feed.

• Saf-D-Grid and RF-203 outlets support 480/277 V operation.

ElectricalRacksOperations

White paperFree to read

Eaton · 2018

Lithium Batteries for UPS Applications: Battery Management and Chemistry Choices Pave the Way

Add cathode chemistry, oxygen-release flag, float life, maximum charge C-rate and BMS disconnect limits (V, I, T) to the battery catalogue.

• Thermal runaway can reach 300-500 C; LFP does not release oxygen at those temperatures and is the safer choice.

UPSFire safetyReliability

Technical guideFree to read

Uptime Institute Journal · 2019

Lithium Ion Batteries for the data center. Are they ready for production yet? (Chris Brown)

Catalogue battery chemistry per UPS with an approved-location field (battery room versus data hall) and charger compatibility flags.

• Related standards: NFPA 855, UL 9540A.

UPSFire safetyReliability

Technical guideFree to read

7x24 Exchange Magazine · 2024

Load Bank Testing in Data Centers (Robert Trefz)

Generate a commissioning test plan from the design: one load bank test entry per genset (resistive-inductive at rated kVA).

• Related references: NFPA 110 and ASHRAE Guideline 0.

CommissioningGeneratorsUPS

StandardCitation

IEC · 2017

Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock

In a fault-loop checker, compute fault-loop impedance for each final and distribution circuit and verify automatic disconnection times for the chosen earthing system.

• 152 pages; a new edition is in preparation.

ElectricalRegulatory

StandardCitation

IEC · 2016

Low voltage electrical installations - Part 6: Verification

In a commissioning module, generate an initial-verification test schedule per circuit from the design model: continuity, insulation resistance, polarity, fault-loop impedance and RCD tests.

• Published 2016-04-27, 100 pages.

ElectricalCommissioning

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IEC · 2025

Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, and definitions

In the electrical rules engine, use IEC 60364-1 as the root of the low-voltage rule set.

• 1.5.2.14 adds energy efficiency.

ElectricalRegulatory

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IEC · 2024

Low-voltage electrical installations - Part 4-42: Protection for safety - Protection against thermal effects

When cable routes cross fire-compartment boundaries, require a fire-stopping element and warn if it is missing.

• Edition 4 published 2024-11-22, 64 pages.

ElectricalFire safetyRegulatory

StandardCitation

IEC · 2023

Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent

In cable and protection sizing, implement Ib <= In <= Iz and I2 <= 1.45 Iz style coordination checks together with short-circuit withstand.

• Related standards are IEC 60364-5-52, IEC 60909-0 and HD 60364-4-43.

ElectricalRegulatory

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IEC · 2024

Low-voltage electrical installations - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances

In surge and EMC design, add an SPD placement rule set: origin of the installation, sub-distribution and sensitive IT boards, with DC SPDs for battery and PV DC buses.

• Clause 443 is amended to introduce DC SPDs.

ElectricalReliability

StandardCitation

IEC · 2024

Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems

In the cable sizing engine, base ampacity on installation-method tables with grouping and temperature derating.

• 521.4: busbar trunking and powertrack systems.

ElectricalRegulatory

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IEC · 2024

Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Devices for protection for safety, isolation, switching, control and monitoring

In the switchgear catalogue, tag devices with isolation suitability and RCD/RCM/IMD monitoring functions.

• Amendment 3 is in preparation.

ElectricalOperations

StandardCitation

IEC · 2021

Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors

Size protective conductors using the adiabatic k-factor check or the table method.

• Document code IEC 60364-5-54:2011+AMD1:2021.

ElectricalSite planning

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IEC · 2018

Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services

In source modelling, keep safety-service loads (fire pumps, smoke extract, emergency lighting) on a separate bus fed by a qualified safety source.

• Does not apply to hazardous areas (BE3), covered by IEC 60079-14.

ElectricalFire safetyGenerators

StandardCitation

IEC · 2019

Low-voltage electrical installations - Part 8-1: Functional aspects - Energy efficiency

In the energy module, score the electrical design for losses (transformer, UPS, cable I2R) and metering granularity.

• Energy efficiency now also appears in IEC 60364-1:2025.

ElectricalEnergy

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IEC · 2020

Low-voltage switchgear and controlgear assemblies - Part 1: General rules

In the switchboard catalogue, store the assembly's rated current (InA), the group rated current or rated diversity factor per circuit, Icw/Ipk and the form of separation.

• Related documents: IEC 61439-2, IEC 61439-6, EN 61439-1, TS EN 61439-1.

ElectricalRegulatory

StandardCitation

IEC · 2020

Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies

On the main LV switchboard object, require form of separation (1-4b) as a catalogue field and default to Form 3b/4 for concurrently maintainable designs.

• Edition 3, published 22 July 2020, 103 pages.

Electrical

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IEC · 2024

Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

Board selection rule: allow the DBO type only for office/support-area final boards within the 250 A/125 A limits.

• Power assemblies are covered separately by IEC 61439-2.

Electrical

StandardCitation

IEC · 2012

Low-voltage switchgear and controlgear assemblies - Part 6: Busbar trunking systems (busways)

In the busway object, catalogue rated current, Icw, R/X per metre, tap-off ratings and IP class.

• Edition 1 published 23 May 2012; 85 pages.

ElectricalRacks

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