Which UPS elements need cross-reference?
Use the equipment tags and schedules to coordinate UPS modules, static bypass, maintenance bypass, batteries, switchboards, PDUs and downstream loads. Keep supplied and inferred items separate.
| Element | Check | Open item |
|---|---|---|
| Input | Source and protective device | Supply boundary |
| Module | Tag and rating from schedule | Module arrangement |
| Bypass | Normal and maintenance path | Operating definition |
| Battery | Interface and source data | Stored-energy scope |
| Output | Feeder and downstream tag | Load schedule |
Sources: Telecommunications Industry Association: ANSI/TIA-942 Telecommunications Infrastructure Standard for Data Centers, National Fire Protection Association: NFPA 70, National Electrical Code
What should not be guessed?
Do not guess module capacity, bypass sequence, battery autonomy, fault rating or protective settings. Raise the missing input with the source and decision owner.
Sources: National Fire Protection Association: NFPA 70, National Electrical Code, National Fire Protection Association: NFPA 110, Standard for Emergency and Standby Power Systems
How is the final set checked?
Check paths, tags, ratings, notes and cross-references against the approved schedules. The responsible engineer decides whether the result is suitable for issue and performs sign-off.
Common questions
What else should the bid team know?
Does this service select the critical power topology?
No. The engineer or design team supplies the approved topology. Drafting makes the approved arrangement readable and traceable.
Can a drawing show a rating that is missing from the schedule?
No. Raise the missing or conflicting input as an open item rather than guessing the rating.
Who performs engineering sign-off?
The registered engineer responsible for the job performs engineering sign-off. The drafter checks the drawing against the supplied inputs.
Primary sources
- ANSI/TIA-942 Telecommunications Infrastructure Standard for Data CentersTelecommunications Industry Association
- Tier Standard: TopologyUptime Institute
- NFPA 70, National Electrical CodeNational Fire Protection Association
- NFPA 110, Standard for Emergency and Standby Power SystemsNational Fire Protection Association