Facility Rating Change Assurance
A conductor study says the line can carry more. The rating belongs to the complete facility: every series element, every clearance, every record that will repeat the number. This verifies all of it before approval.
CHECKED AGAINST
- NESC 232
- NERC FAC-008
- Utility rating methodology
A data center needs 80 MW. An initial study proposes uprating an existing 138 kV line from 900 A to 1,200 A.
- Line designThe line-design report supports the new conductor condition, subject to its documented assumptions.
- EAMThe asset registry lists the terminal disconnect at 1,200 A. The latest one-line says 900 A. No field record settles it.
- GISAt the proposed condition, one road crossing clears by 21.2 ft against a 22.4 ft requirement. The uprate itself creates the breach.
- CodesThe planning model, operations model, and final engineering approval have not caught up with the proposed rating.
The conductor passed. The complete line did not. Promising the capacity anyway is how rating incidents start.
