What should the layout review cover?
Review the room as an interface drawing. Equipment, structure, cable routes, ventilation, fire systems, doors and maintenance access can all change the arrangement.
| Layer | Check | Owner of decision |
|---|---|---|
| Geometry | Room, doors and floor levels | Project design team |
| Equipment | Approved footprints and access needs | Responsible engineer and vendor |
| Cables | Trenches, entries and segregation | Electrical and civil teams |
| Services | Ventilation and fire interfaces | Coordinating disciplines |
| Drawing | Dimensions, tags and open items | Drafter and checker |
Which references can inform the project basis?
IEC 61936-1 covers safety and proper functioning requirements for power installations above 1 kV AC within its scope. IEEE C2 covers practical safeguarding for US supply stations and associated lines. Apply the project-specific edition and jurisdictional requirements.
Sources: IEEE Standards Association: IEEE C2-2023 National Electrical Safety Code, International Electrotechnical Commission: IEC 61936-1:2021
What must remain open?
Leave any unapproved clearance, fire rating, load, cable route or access assumption as an open item. Engineering sign-off is performed only by the registered engineer responsible for the job.
Common questions
What else should the bid team know?
Why are there no generic clearance numbers here?
The required value depends on voltage, equipment, jurisdiction, standard edition and project conditions. Use the approved project basis.
Can vendor drawings set the whole layout?
They provide equipment inputs. The project team still coordinates the room, interfaces and applicable requirements.
What should an illustrative GA show?
It can show review layers and drawing structure, but it must not present synthetic dimensions as project requirements.
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