Which drawings are commonly coordinated?
Start with the project drawing list, not a generic product list. Use the single line as the index for equipment tags, then check that arrangements, schematics and schedules carry consistent identifiers.
| Drawing group | Coordination check | Source |
|---|---|---|
| Single line | Sources, buses and feeders | Approved topology |
| Arrangement | Equipment outline and access | Vendor data and plan |
| Protection | Trip and interlock logic | Approved logic |
| Cable schedule | From and to references | Cable register |
| Issue record | Revision and review status | Document control |
Sources: International Electrotechnical Commission: IEC 61936-1:2021, International Electrotechnical Commission: IEC 60617 Graphical Symbols for Diagrams
How should drawing references be controlled?
Keep a drawing register with number, title, revision, status, source inputs and reviewer. A drawing can be geometrically complete while still using an obsolete schedule or markup.
- Cross-check equipment tags
- Record source revision
- Show open design items
- Keep native and review files aligned
- Route engineering comments to the responsible reviewer
What does the issue review confirm?
The drafter checks the drawing against supplied inputs and the drawing standard. The registered engineer responsible for the job confirms the engineering content and sign-off.
Sources: IEEE Standards Association: IEEE C2-2023 National Electrical Safety Code, Occupational Safety and Health Administration: 29 CFR 1910.269
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