What does the manufacturer example distinguish?
The cited Easy UPS 3S installation document separates operation from storage. Its environmental table identifies elevation-dependent power derating for the stated product family. Those product-specific conditions illustrate why an operating rating cannot be taken from a storage column or transferred to a different UPS.
Critical Power Drafting is independent and is not affiliated with Schneider Electric. Use the exact current model, configuration and installation document. This worksheet neither selects a UPS nor determines installation suitability.
Sources: Schneider Electric: Easy UPS 3S 208/220 V Environmental, document 990-6401C-001
What belongs in the drawing and schedule reference?
Obtain the approved site-elevation input and keep its units. Identify the actual UPS variant and the engineer-reviewed operating envelope. A site described only as high altitude does not provide a usable elevation or manufacturer rule.
| Schedule field | Source required | Mismatch to expose |
|---|---|---|
| Model | Approved equipment selection and manual revision | Different product family |
| Site elevation | Controlled project input and units | Assumed sea-level basis |
| Operating envelope | Manufacturer environmental conditions | Storage used as operation |
| Derating | Applicable factor or curve and conditions | Generic percentage copied |
| Available rating | Engineering-approved result and power basis | kW and kVA interchanged |
| Disposition | Engineer decision and drawing revision | Unresolved basis hidden |
How can an unchanged nameplate hide a changed drawing basis?
Illustrative example. A fictional UPS schedule carries a nominal 120 kVA entry. For this exercise alone, assume the responsible engineer has approved a 0.93 factor for the specified operating conditions. The corresponding arithmetic is 120 x 0.93 = 111.6 kVA. A downstream schedule still using 120 kVA has not captured that approved basis.
The values and factor are invented. They are not specifications for Easy UPS 3S, a recommended derating rule or a complete capacity assessment. Do not multiply unrelated derating factors or convert this kVA result into kW without the actual approved method.
How should a revised location be handled?
Trace a location or model change through the approved equipment schedule, output-capacity note and load-study reference. Preserve the earlier basis and record which engineering decision supersedes it. A revised drawing note does not itself approve the load, cooling arrangement, redundancy or protection.
Escalate missing or conflicting manufacturer conditions to the technical owner. Engineering sign-off is performed only by the registered engineer on the job; no live operating or installation instruction is supplied here.
Common questions
What else should the bid team know?
Can the storage elevation establish an operating rating?
No. Use the operating conditions and exact product reference.
Is 0.93 a general UPS altitude factor?
No. It is an invented assumption in the illustrative example.
Can a drafter approve the available capacity?
No. Record the responsible engineer's approved basis.
Primary sources
- Easy UPS 3S 208/220 V Environmental, document 990-6401C-001Schneider Electric