Which dimensions need a source?
Separate dimensions supplied by the vendor from those coordinated by the project. Record the source revision beside the dimension so a later outline change can be found.
| Area | Dimension or interface | Source |
|---|---|---|
| Envelope | Overall length, width and height | Approved outline |
| Service | Access and removal path | Project requirement |
| Ventilation | Opening and equipment interface | Approved airflow basis |
| Connections | Cable, fuel and exhaust boundary | Equipment data |
| Handling | Lifting or transport point | Vendor information |
Sources: National Fire Protection Association: NFPA 110, Standard for Emergency and Standby Power Systems, ASHRAE: ASHRAE Handbook
How should missing dimensions be shown?
Mark the input as open and name the source needed to close it. Do not scale an image or copy a dimension from a different model.
- Identify the affected view
- Record the vendor revision
- Separate supplied and assumed geometry
- Route clearance questions to the engineer
- Update the drawing register when closed
What needs specialist review?
Acoustic, thermal, ventilation and structural performance claims need qualified review. A drafting pack can organise the geometry and inputs without certifying performance.
Sources: US Environmental Protection Agency: Generator enclosure design guidance, ASHRAE: ASHRAE Handbook
Common questions
What else should the bid team know?
Does a drawing pack certify acoustic or thermal performance?
No. Acoustic predictions, ventilation performance and certification require qualified review against the project inputs and applicable requirements.
Can enclosure dimensions be guessed from the genset name?
No. Use the approved vendor outline, service clearances and project constraints. Missing dimensions remain open.
Who approves the engineering design?
The responsible registered engineer or qualified project reviewer approves engineering content and performs sign-off.
Primary sources
- Generator enclosure design guidanceUS Environmental Protection Agency
- NFPA 110, Standard for Emergency and Standby Power SystemsNational Fire Protection Association
- ASHRAE HandbookASHRAE