Which grounding information should be coordinated?
Use the approved grounding design, civil background, equipment arrangements, cable routes and project drawing standard. Keep supplied and open values distinct.
| Area | Drawing content | Source |
|---|---|---|
| Grid | Layout and conductor references | Grounding design |
| Equipment | Bond and connection | GA and detail |
| Structures | Fence or steel bond | Civil or structural input |
| Test points | Location and identifier | Approved detail |
| Notes | Installation and evidence | Project requirement |
Sources: International Electrotechnical Commission: IEC 61936-1:2021, Occupational Safety and Health Administration: 29 CFR 1910.269
What should remain with the engineer?
Grounding design values, conductor selection, touch or step assessment and engineering acceptance remain with the responsible engineer. Drafting records the approved basis.
- Design source
- Equipment tags
- Conductor references
- Connection details
- Test responsibility
How should a missing detail be shown?
Use an open item and reference the source needed to close it. A neat plan is not evidence of an approved grounding design.
Common questions
What else should the bid team know?
What should a substation grounding drawing include?
It should show the approved layout, bonds, conductor references, test points, notes and source status.
Who reviews a substation grounding drawing?
The drafter prepares the representation, while the engineer confirms the design and sign-off.
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