Factory Acceptance Testing (FAT) proves that major equipment meets its specification before it leaves the factory. An owner's witness should confirm that the test procedure matches the specification, that tests are performed with calibrated equipment, that results are recorded against acceptance criteria, and that non-conformities are closed before shipment.
Key Takeaways
- Agree the FAT procedure and witness points before manufacture.
- Check results against the specification, not just the manufacturer's standard.
- Confirm test equipment calibration.
- Close non-conformities before release for shipment.
Why FAT Matters
Problems found at the factory cost far less to fix than problems found on site or at energisation. FAT is the last controlled opportunity to confirm that transformers, switchgear, panels and other major equipment match what was specified and purchased.
Before the Visit
Review the test procedure against the technical specification and the applicable standard, agree hold and witness points, and confirm what documentation will be issued — test certificates, drawings and calibration records.
During the Tests
Witness the agreed routine and, where specified, type or special tests. Record measured values beside acceptance limits, check nameplates and physical construction against approved drawings, and note any deviation.
After the Tests
Non-conformities are recorded, corrected and re-tested where needed. The witness report documents what was seen, what was accepted and what remains open before release.
Who Should Witness
An Owner's Engineer or independent party witnesses on the owner's behalf. We witness FAT as part of procurement and construction support.
Frequently Asked Questions
Is FAT the same as site acceptance?
No. FAT happens at the factory before shipment; site acceptance confirms correct installation and performance on site.
Can FAT be witnessed remotely?
It can be agreed, but physical inspection of construction and nameplates is more reliable in person.
