What belongs in a revision record?
Record the drawing number, revision, title, issue purpose, change summary, source markups, reviewer and issue date. Preserve the prior revision and its status.
| Field | Purpose | Example |
|---|---|---|
| Drawing number | Stable identity | Project SLD identifier |
| Revision | Sequence or code | Current issued revision |
| Change | Reason for update | Vendor data incorporated |
| Source | Traceability | Markup or schedule |
| Review | Approval status | Engineer review open |
Sources: International Electrotechnical Commission: IEC 60617 Graphical Symbols for Diagrams
How are multi-drawing changes coordinated?
Group related updates under one change action, then check every affected drawing, schedule and cross-reference. A revision to a tag or feeder can affect more than one sheet.
- Find references to changed tags
- Update the drawing register
- Compare native and PDF output
- Record comments and disposition
- Issue only the approved set
What should the title block communicate?
Use the project title block and status convention. The title block should make the drawing identity, revision, issue purpose and review state legible without relying on a private filename convention.
Common questions
What else should the bid team know?
Does drafting decide the substation design?
No. Drafting turns approved engineering inputs into controlled drawings. The responsible registered engineer makes design decisions and performs sign-off.
Can a drawing set use any symbol library?
Use the project drawing standard and approved symbol convention. Where a standard is specified, the project team confirms the applicable edition and licensed access.
What happens when a dimension is missing?
Show it as an open input or request the approved source. Do not invent a clearance, rating or equipment outline.
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