Section 26.05.73.13 covers short-circuit studies used to determine available fault current and confirm that installed electrical equipment has adequate interrupting capacity for the system it serves.
In practice, this section sits at the intersection of engineering analysis, field verification, procurement control, and energization readiness. The checklist built around this section is not just a paperwork exercise. It connects utility-source data, approved overcurrent device submittals, field-verified conductor routes, equipment nameplate information, and revised one-line diagrams into one auditable QAQC workflow. That matters because a short-circuit study only adds value when the model still matches the installation in the field.
The FTQ360 approach turns that requirement into a structured control path. It helps the team verify study scope, software qualifications, professional-engineer oversight, field data collection, equipment duty comparisons, mitigation tracking, and final labeling before owner turnover. The result is a data-backed record that supports safer energization, cleaner turnover, and more reliable future maintenance decisions.
What the Checklist Covers
This checklist tracks the short-circuit study from setup through final closeout. It starts with study scope, software qualification, engineer and testing-agency credentials, and the request for utility available-fault-current or impedance data.
It then moves into field data capture for sources, ties, transformers, reactors, breakers, fuses, busway, motors, generators, conductors, and device settings, making sure the equipment tags used in the model match approved drawings and installed labels.
From there, the checklist follows the study through execution. It confirms that the analysis begins at the service and extends through the system locations defined for the project, including normal-system low-voltage load buses where the specification calls for the study to continue.
It checks that the model covers normal and alternate switching conditions that can create maximum fault duty, that manual calculations are not being used as the basis of the final study, and that the study output includes the fault, momentary-duty, and interrupting-duty information needed to compare calculated available current against installed equipment ratings.
By closeout, the checklist ties together the stamped report, final one-line diagram, exception closure, permanent available-fault-current labels, and the O&M record package.
Checklist Preview
This section has a familiar pattern of failure points. One of the biggest is stale or undocumented utility data. If the service contribution changes and the study is not updated, the entire duty comparison can become unreliable.
Another is equipment drift between submittal and installation: a circuit breaker, fuse, panelboard, or switchboard that does not match the modeled catalog number can invalidate the study even when the report itself looks complete.
Field changes create similar problems. A feeder reroute, a changed conductor length, a different transformer tap, or an undocumented trip-setting adjustment can all change the basis of the analysis.
Mitigation measures create their own risk. Series-rated combinations and current-limiting devices only work when the exact listed upstream-downstream pair and installation conditions match the study assumptions. If those assumptions change without formal review, the mitigation can disappear without anyone noticing.
The checklist is designed to catch that drift early by tying engineering assumptions to field evidence such as utility letters, one-line markups, nameplate photos, settings logs, revision histories, duty tables, and label photo records.
That is where digital QAQC goes beyond paperless storage. It creates traceability across the whole workflow so the team can act on mismatches before procurement, energization, or turnover.
This phase takes place before field data collection begins and before procurement or energization assumptions are locked. The first priority is confirming that the study scope, the current one-line revision set, and the responsibility matrix are approved so everyone is working from a controlled basis.
The checklist then verifies that the power-system analysis software is commercially developed for this type of study, that it aligns with the required IEEE-based workflow, and that the responsible professional engineer and qualified field personnel are identified before surveys start.
Utility coordination is also a preparatory control, not something to sort out later. Available fault-current or impedance requests must be submitted early because service-duty assumptions affect every downstream device comparison.
The preparatory record also establishes the controlled document path for field-collected conductor sizes, lengths, equipment data, and one-line revisions so late discoveries do not remain scattered across notes, photos, and emails.
If utility data is missing, if study personnel are not qualified, or if overcurrent device submittals are not approved, the checklist should hold the process before the study is released for procurement or energization decisions.
This phase confirms that the study starts correctly. The first input package should already include the current one-line diagram, approved overcurrent protective device submittals, transformer data, conductor data, and the utility-source letter before the software model is built.
The checklist uses the first field-survey sample to verify that equipment designation tags in the study match field labels and approved drawings exactly, because a clean report tied to the wrong equipment is still a failure.
It also verifies the first modeled feeder by tracing conductor type, size, length, source device, and downstream bus from field evidence into the model.
Once the first draft results are issued, the checklist reviews at least one location for three-phase bolted fault and single-line-to-ground fault results and compares the calculated duty against the interrupting rating of the installed equipment at that location.
This first-article review is a critical hold point. Procurement release, device-setting release, or energization planning should not move ahead until the team confirms that the modeled data and the installed condition are aligned.
Follow-Up Phase
This phase keeps the study aligned with the real installation as the project evolves. Every feeder revision, transformer tap adjustment, equipment substitution, routing change, or trip-setting change has to flow back into the model before energization, not after.
The checklist tracks case building for normal and alternate switching configurations that can create maximum fault conditions and confirms that source contributions from motors or generators are included wherever they affect available fault current.
It also follows equipment-duty review across switchboards, switchgear, panelboards, overcurrent devices, and other studied locations to confirm that interrupting ratings and related duty assumptions remain adequate.
Where the design depends on current-limiting devices or series-rated combinations, the checklist verifies the exact manufacturer, type, ampere rating, and pairing assumed in the study.
As the record is finalized, the checklist follows the posting of permanent available-fault-current labels so the field condition, the study basis, and the maintenance record all stay synchronized.
Completion — Final Acceptance & Closeout
All of the work culminates in a final study package that can be trusted in the field. Before turnover, the checklist verifies that the final short-circuit study report is signed, dated, and sealed by the responsible professional engineer and that the final one-line diagram reflects actual installed sources, ties, transformer ratings, conductor data, and protective device catalog numbers.
It also confirms that service and distribution equipment interrupting ratings remain adequate for the calculated duties in the final configuration and that any inadequately rated equipment has been replaced or mitigated with documented closure.
Final acceptance also depends on field communication, not just engineering paperwork. Applicable equipment fronts should carry permanent labels showing the available fault current, the interrupting rating, and the study date so future modifications are made with current information in hand.
Closeout is complete only when the stamped report, final one-line, input data files, utility-source documentation, exception log, and label schedule are all included in the O&M turnover package.
References and Other Specification Systems
NICET Electrical Power Testing certification requirements
Utility available fault-current data requirements where applicable.
Other Specification Systems
Equivalent sections in UFGS, VA Master Specifications, NMS, and RIB SpecLink should be verified against the current master used on the project.
The source workbook flags those crosswalks for confirmation rather than treating a single section number as universally interchangeable.
FTQ360 turns short-circuit study control from a stack of disconnected submittals into a traceable field-to-engineering workflow.
Teams can tie utility letters, one-line markups, nameplate photos, settings records, duty tables, exception logs, and label photos to the same checklist record, whether they are online or working offline in the field. Required fields, conditional controls, and documented hold points make it harder to release procurement, settings, or energization on incomplete assumptions.
That is the bigger advantage of a digital-first QAQC process. It is not just about replacing paper. It is about making the study usable as live project data.
When the information is structured, recurring problems like mismatched device catalog numbers, stale utility letters, missing labels, or unreconciled one-line changes become visible soon enough to correct them before they become safety, schedule, or turnover failures.
Prefer the FTQ360 in-app setup?
In FTQ360, open Checklist Setup, go to Library, search for 26.05.73.13, and clone the template into your project.
Then tailor the checkpoints to the project one-line structure, equipment naming convention, utility coordination path, and required hold points.
If part of the team still uses paper during surveys or walkdowns, you can print a PDF version and bring the evidence back into FTQ360 afterward, but the digital workflow is what preserves tag-level traceability, required approvals, and a usable turnover record.
For implementation help, visit support.ftq360.com.
MasterSpec® and MasterFormat® are registered trademarks. This blog references section numbers and titles for clarity only and does not reproduce proprietary content. Copyright FTQ360.