AF-ELEC-03high confidenceCritical
Single electrode configuration applied to every bus in the facility
Every one of the ~90 rows in the incident energy report carries Electrode Config = VCB. The same facility contains 480 V service switchboards, automatic transfer switches, generator skid breakers, UPS modules, static transfer switches, PDUs, 208 V branch panelboards and dry-type transformer secondaries. Those are not one electrode arrangement. The uniformity is the signature of a global software default that was never revisited per bus.
- Source
- Source: pp. 42–44, Appendix F Incident Energy Report, Electrode Config column
- Code ref
- not available — reported as a general engineering observation
- Action
- Assign electrode configuration per bus from actual equipment construction and re-run. This input changes incident energy directly.
One column, ninety rows, one value. It takes a reader about four seconds to check and it changes every number in the study.
AF-RES-01high confidenceCritical
Arcing fault current reported higher than bolted fault current at a 0.23 kV bus
One 0.23 kV row reports Bus Bolted Fault = 0.496 kA and Bus Arc Fault = 0.538 kA. Arcing current cannot exceed the bolted fault current at the same location. The row that follows reports 1.708 kA bolted / 1.268 kA arcing, which is the expected ordering, so the anomaly is confined rather than systematic. The result derived from the anomalous row is 2.7 cal/cm² with a 31.5 in boundary.
- Source
- Source: Attachment A — Incident Energy Tabulation, 0.23 kV row
- Code ref
- not available — reported as a general engineering observation
- Action
- Re-derive that row. Either the bolted value or the arcing value is wrong, and the incident energy and boundary printed for that bus follow from it.
A physically impossible pair of numbers inside a sealed, issued study — and the label on that equipment was printed from it.
AF-MODEL-01high confidenceCritical
The report states neither the IEEE 1584 edition nor the short-circuit standard behind its numbers
No section of the submitted report names the arc flash calculation model or the edition of IEEE 1584 it follows, and no standard or method is cited for the short-circuit calculation the model was fed — not in the methodology narrative, not in the assumptions list, and not in the software settings appendix where the basis is normally recorded. The results tables present incident energy, boundary, and PPE values with no statement of what produced them. A reviewer cannot tell whether the 2002 or 2018 arc flash model was applied — and therefore cannot tell which inputs the study was required to declare, whether the equipment falls inside the applicability range of the model used, or whether a missing electrode configuration is a defect or simply not applicable. Nor can the fault currents be checked, because an IEEE method and an IEC method do not compute them the same way and the report does not say which was used.
- Source
- Source: methodology narrative; assumptions list; software settings appendix — arc flash edition and short-circuit basis absent from all three
- Code ref
- not available — reported as a general engineering observation
- Action
- Ask the study author to state, in writing, the arc flash calculation model and IEEE 1584 edition, the standard or method used for the short-circuit calculation, and the software and version the results were produced with. Until those are on the record, no downstream check in this review — applicability limits, electrode configuration, arcing current sensitivity, source data — can be evaluated against the correct criteria.
Everything else in a study review is conditional on these two statements. A study that will not say what it was calculated to cannot be reproduced, checked, or defended — by you, by the next engineer to inherit it, or by anyone asked about it years later.
AF-TIME-03high confidenceCritical
A 37-second trip time is truncated to a 2-second arc time
The 0.23 kV auxiliary rows report Trip Time = 37.087 s and Trip Time = 6.681 s, with Arc Time set to 2 in both cases. The stated basis is that arcing time is limited to two seconds. A two-second cap is an assumption that a worker can move out of the arc within two seconds. The study applies it without evaluating the specific work position, which in this case is inside a wind turbine nacelle or tower base, where egress is constrained by definition.
- Source
- Source: §4 Basis of Analysis, item 3; Attachment A, 0.23 kV rows
- Code ref
- not available — reported as a general engineering observation
- Action
- Evaluate egress at the specific work positions. If a worker cannot clear the boundary in two seconds, the cap does not apply and the uncapped result governs.
The gap between a 37-second device response and a 2-second reported exposure is the largest single assumption in that study, and it is one line of text.
AF-RES-04high confidenceCritical
Executive summary undercounts the buses above 40 cal/cm² and omits one by name
The summary names three locations above 40 cal/cm². The evaluation table shows four: 100 cal/cm², 73 cal/cm², 71 cal/cm² and 61 cal/cm². The 71 cal/cm² bus — the third highest in the facility — is not mentioned anywhere in the summary. A reader working from the summary alone would not know it exists. The summary also justifies the named locations as being immediately downstream of the existing transformer; the unnamed one is fed from a different device, so that justification does not obviously extend to it.
- Source
- Source: §1.3.3 Arc Flash Results, p. 4; Appendix C Arc Flash Evaluation table, rows 1–4, p. 49
- Code ref
- not available — reported as a general engineering observation
- Action
- Correct the summary to name all four buses and state the disposition of the omitted one.
This is the kind of gap that survives into an O&M manual and then into a work permit.
AF-GEOM-03high confidenceCritical
Incident energy is reported without working distance in every results table
None of the arc flash result attachments carries a working distance column. An incident energy without the distance it was calculated at cannot be compared against a PPE arc rating or transferred to a label. The narrative asserts that the labels carry working distance; the calculation output does not.
- Source
- Source: §10 Attachments 6–9, results table column set
- Code ref
- not available — reported as a general engineering observation
- Action
- Add working distance per row to the results tables so each energy value is usable and auditable.
A cal/cm² figure with no distance beside it is not a result. It is a number.
