What does it connect to?
The SLD acts as an index to more detailed schedules, studies, schematics, general arrangements and controls documents.
| Element | SLD shows | Supporting detail |
|---|---|---|
| UPS | Tag and supplied rating | Data sheet and bypass schematic |
| Switchboard | Bus and feeder paths | GA and schedule |
| Generator | Connection and rating | Plant layout and controls |
| Load | Destination boundary | Load schedule |
Which references may frame the system?
TIA-942 includes electrical infrastructure in its data center scope. NFPA 70 covers US electrical installations. The selected project editions and authority requirements control.
Sources: Telecommunications Industry Association: ANSI/TIA-942 Telecommunications Infrastructure Standard for Data Centers, National Fire Protection Association: NFPA 70, National Electrical Code
Common questions
What else should the bid team know?
Is it the same as a wiring diagram?
No. The SLD simplifies the power system, while wiring diagrams show detailed connections.
Does it show physical location?
Usually not. General arrangements and layouts carry physical position.
Can a drafter add missing ratings?
No. Missing ratings should be raised to the responsible engineer.
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