Which interface fields should be coordinated?
Use a register for power connection, breaker or isolator, control signals, protection, neutral or grounding interface, fuel or exhaust boundary and testing responsibility.
| Interface | Drawing check | Source |
|---|---|---|
| Power | Connection and tag | SLD |
| Control | Start, stop and status | Control philosophy |
| Protection | Trip or lockout path | Approved logic |
| Grounding | Bond and neutral boundary | Grounding design |
| Testing | Witness and evidence | Commissioning plan |
What should not be inferred?
Do not infer control sequence, protection setting, fault rating or grounding arrangement from a generic generator symbol. Raise missing inputs.
- Equipment revision
- Connection boundary
- Signal list
- Protection source
- Test owner
What is the final interface check?
Check the SLD, schematic, GA, schedule and interface register use the same tags and revision. The responsible engineer decides the technical position.
Common questions
What else should the bid team know?
What should a generator switchboard interface include?
It should show power, control, protection, grounding, equipment, testing and party boundaries.
Who reviews a generator switchboard interface?
The drafter coordinates the representation, while the engineer approves the system design and sign-off.
Does drafting approve the critical power design?
No. The responsible registered engineer makes design decisions and performs engineering sign-off.
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