EngiMetric
Medium-voltage switchgear, transformer and cable trays in an electrical plant room

Stage 4 of 14 / Calculation

Size the electrical infrastructure and losses

Convert concurrent IT peak and critical auxiliary load into UPS input, facility demand, transformer capacity, battery energy and generator capacity using explicit efficiencies and loading targets.

  • Advanced
  • 14 stages
  • 22 min
  • Mission-critical electrical and thermal systems
Development preview AI Data Center: Full Engineering Workbench
Development preview. The calculations on this journey run on existing EngiMetric engines, but the journey text and scope have not completed independent engineering review. The route is excluded from search while it remains a preview.
Professional review required.Engines and workbench are implemented and tested. Defaults, sources and engineering assumptions still require independent review before publication or use on a real project. Current verification state: Needs engineering review.

After this stage you can

Learning objectives
  • Trace IT load through UPS, PDU, transformer and cable losses to facility demand.
  • Check transformer, UPS, battery and generator sizing against loading targets and topology rules.
  • Distinguish real power, apparent power, installed capacity and usable capacity.

The engineering

The electrical model is an energy balance. IT peak and UPS-backed critical auxiliary load create UPS input after UPS efficiency. PDU losses, non-critical auxiliary load and cooling power are added upstream. Transformer and cable losses are applied to that throughput. The result is the facility demand at the utility connection.

Cooling power is itself an electrical load, and electrical losses are a cooling load. The model resolves this loop by fixed-point iteration. If it does not converge, the report says so instead of hiding an unstable result.

Equipment is not sized by dividing load by nameplate rating. Each block uses a loading target and a topology requirement: N, N+1 or 2N. Battery energy uses autonomy, depth of discharge and discharge efficiency. Generator rating includes a margin and a step-load screening check. Short-circuit, protection coordination, arc-flash and conductor sizing remain outside the implemented scope.

Low-voltage switchgear and dry-type transformer in an industrial electrical room
The equipment schedule names ratings and quantities. It does not prove protection coordination, arc-flash safety or utility approval.

EngiMetric / AI data-center workbench

One project, computed from rack to report

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Preview screen. Inputs are saved in this browser only. Climate, grid, water and cost values are illustrative. Failed checks stay visible; a clean summary is not a stamped design and no Tier rating is claimed.

Your deliverable for this stage

Capstone evidence

An electrical load summary, equipment schedule and failed-check list for the selected topology.

Stage assumptions, limits and sources

Provenance

Assumptions

  • Cooling power is a facility load; only IT and critical auxiliary load are UPS-backed.
  • Transformer and cable losses are proportional to throughput.
  • Battery energy is sized from UPS load, autonomy, depth of discharge and efficiency.

Constraints

  • Preliminary equipment schedule only; not a procurement bill of quantities.

Limitations

  • No short-circuit, protection-coordination, arc-flash or conductor-sizing study.
  • No harmonics, inrush, motor-starting or generator transient-stability model.
  • No utility interconnection or transformer inrush design.

Review status

  • Needs engineering review
  • Professional review is required before publication or use as a design basis.

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Stage kind: Calculation / Journey: ai-data-center / Stage: electrical-infrastructure