Time to power
What sets the date is usually one item’s lead time.
Each constraint on an existing hall has a relief, and each relief has a lead time. These are the ranges the engine uses when it has no quotation of your own. They are ranges from a reference library, not quotations, and a date built on one is labelled as resting on an assumption, not presented as a date.
| Constraint | Domain | Indicative lead time | What the cost figure for the relief rests on |
|---|---|---|---|
| Firm supply (grid import and behind-the-meter) | electrical | 30 to 260 weeks | no priced relief in the library |
| Transformer capacity | electrical | 52 to 160 weeks | E0, library default |
| Chilled-water plant capacity | thermal | 24 to 60 weeks | E0, library default |
| UPS capacity (protected load) | electrical | 20 to 52 weeks | E0, library default |
| Achievable facility water temperature | thermal | 20 to 52 weeks | E0, library default |
| Busway ampacity | electrical | 16 to 44 weeks | E0, library default |
| Rack feed / tap-off rating | electrical | 12 to 40 weeks | E0, library default |
| CDU capacity at site conditions | thermal | 16 to 40 weeks | E0, library default |
| Floor loading | physical | 12 to 40 weeks | no priced relief in the library |
| Hydraulic flow capacity | thermal | 12 to 36 weeks | no priced relief in the library |
| Cooling architecture per-rack capability | thermal | 12 to 36 weeks | no priced relief in the library |
| Residual air load removal per rack | thermal | 10 to 30 weeks | E0, library default |
| Available rack positions | physical | 4 to 20 weeks | no priced relief in the library |
How to read this
- A wide range means the item is uncertain, not that the table is vague: the spread between the low and the high is the uncertainty.
- The longest range among the items your hall needs sets the date, because items procure in parallel.
- Replace a range with a quotation and the date tightens, and its evidence class improves. See evidence classes.
- Supplier lead times move; a range here is not a promise that anyone will deliver inside it.