Which interfaces need a row?
Start with the project systems and drawing list. Add a row wherever a party needs an input, connection, approval, record or handover from another party.
| Interface | Input | Closure |
|---|---|---|
| Primary to protection | Device and trip data | Approved schematic |
| Civil to electrical | Foundation and entry | Reviewed arrangement |
| Supplier to drafter | Outline and terminal data | Current vendor file |
| Construction to test | Installed record | Inspection evidence |
| Test to handover | Result and deficiency | Accepted record |
How should an unresolved interface be managed?
State the missing input, affected drawings or work package, owner, due date and interim treatment. Keep responsibility unassigned only as a visible risk.
- Both parties
- Source document
- Required handoff
- Owner and due date
- Closure evidence
Why does this help drafting?
A drawing often fails because a boundary is unclear rather than because a line is missing. The register makes that boundary explicit before issue.
Common questions
What else should the bid team know?
What should a substation interface register include?
It should identify both parties, source, handoff, owner, due date, affected drawings and evidence.
Who reviews a substation interface register?
The project lead controls it, with each discipline confirming its own input and acceptance.
Does drafting approve the engineering design?
No. The responsible registered engineer makes design decisions and performs engineering sign-off.
Primary sources
- IEEE C2-2023 National Electrical Safety CodeIEEE Standards Association
- IEC 61936-1:2021International Electrotechnical Commission
- IEC 60617 Graphical Symbols for DiagramsInternational Electrotechnical Commission
- 29 CFR 1910.269Occupational Safety and Health Administration