Why is a runtime note more than a number of minutes?
Eaton provides separate runtime resources for selected UPS models and configurations with or without optional battery packs. This supports tracing a runtime figure to the actual product and battery arrangement. It does not establish a runtime for an unspecified data center installation.
Critical Power Drafting is independent and is not affiliated with Eaton. The design owner approves the required load case and runtime evidence. A drafter coordinates those approved inputs across the drawings and schedules.
Sources: Eaton: Eaton UPS battery runtimes
Which evidence belongs beside the drawing note?
Separate the required duration from the supported duration reported by a selected source. A schedule that copies a requirement into a performance field conceals whether the arrangement was actually assessed.
| Field | Record | Check |
|---|---|---|
| Requirement | Required duration and load case | Identify the approved design basis |
| Equipment | UPS model and configuration | Match the exact selected resource |
| Load | Value, unit and operating case | Keep kW and kVA definitions clear |
| Battery | Approved arrangement and condition basis | Do not infer from cabinet count |
| Runtime evidence | Curve or calculation revision and conditions | Record the actual applicable point |
| Approval | Engineering disposition and drawing revision | Leave unsupported figures open |
What does a load mismatch look like?
Illustrative example. A fictional schedule requires 10 minutes at 80 kW. Its supporting note merely says 15 minutes at 40 kW for a named assumed arrangement. The 15-minute figure does not prove the 80 kW requirement is met. The missing 80 kW evidence stays open for the design owner.
Do not halve the duration, double the battery count or interpolate a curve without the manufacturer and engineer-approved basis. The invented figures are not product performance, a battery sizing method or evidence that the installed system passes or fails.
How should a changed battery arrangement be handled?
Link the approved change to the runtime evidence as well as the battery schedule and one-line reference. Keep the earlier assessment with its original configuration. A correct count reconciliation can coexist with an outdated performance reference.
Do not commission batteries, alter connections or authorize a load test from this worksheet. Engineering sign-off is performed only by the registered engineer on the job.
Common questions
What else should the bid team know?
Does a UPS kW rating establish runtime?
No. Runtime needs the actual load and battery arrangement evidence.
Does twice the cabinet count guarantee twice the runtime?
No. Use the approved manufacturer and engineering assessment.
Can a requirement be copied into the supported-runtime field?
Only actual supporting evidence establishes that field; keep the requirement separate.