Follow a selected load from the floor plan to its circuit entry, panel schedule, feeder, and upstream one-line diagram. Compare the equipment identity and stated ratings at each step, then check the relevant controls and specifications. Keep engineering adequacy checks separate from reference matching.
Trace the emergency power package
The NFPA 110 emergency power guide follows the selected source, transfer equipment, supplied-load references, physical receiving details, and supporting services. Use it to connect the electrical package to the building interfaces, while leaving sizing and performance decisions with the qualified designer. UPS and battery sources follow the NFPA 111 stored energy guide, and the wider distribution follows the NFPA 70 (NEC) guide.
Confirm the electrical review boundary
Assemble site and floor power plans, lighting and control plans, one-lines, panel and equipment schedules, details, specifications, and the current mechanical or plumbing equipment data. Include the load and fault-study references needed by the electrical engineer. Record missing utility information or pending equipment selections as review limitations.
Distinguish existing distribution from proposed additions and removals. A renovation can retain a panel while changing its connected loads. The review record should identify the project issue and exactly which circuits, panels, spaces, and systems were examined. A drawing date alone does not establish that an existing panel schedule is current.
Phoenix’s electrical plan review checklist, revised August 2026, identifies the 2023 NEC and relevant 2024 building and energy-code references. It is a local review reference. Use the edition adopted for the actual project, its amendments, and applicable utility requirements when deciding technical acceptance.
Twelve electrical connections to review
The table organizes a document trace from distribution identity through revisions. Use the CSV to record the observed condition and the person who will decide it. Add rows for separate panels, loads, or control zones instead of marking an entire building complete after one sample.
| Review area | Sources to compare | Question to resolve |
|---|---|---|
| Distribution identity | Service diagram, one-line, floor equipment locations | Can each distribution node be identified consistently on the diagram and at its physical location? |
| Panel references | Plan circuit tags, panel schedules, upstream diagram | Does every sampled panel/circuit reference resolve to an entry supplied in this package? |
| Equipment ratings | One-line labels, panel headings, equipment specification | Are the stated voltage, phase, and rating descriptions consistent for the same equipment? |
| Connected loads | Equipment connection data, circuit entry, load summary | Does the scheduled load represent the equipment now selected, with changes sent for design recalculation? |
| Feeder descriptions | One-line feeder mark, feeder schedule, installation notes | Do repeated feeder references describe the same conductor, protection, and routing intent? |
| Protective devices | Device schedule, one-line, engineering study references | Can device selections be traced to the applicable design review without treating matching labels as proof of adequacy? |
| Grounding and bonding | System details, equipment notes, specifications | Do the drawings clearly reference the intended grounding and bonding arrangement for the system? |
| Lighting controls | Fixture tags, control zones, sequence | Does each controlled fixture group match its switches, sensors, and described operating modes? |
| Emergency functions | Emergency/standby diagram, lighting plan, control notes | Are source assignments and described behavior during loss of normal power coordinated? |
| Equipment access | Electrical room arrangement, sections, adjacent services | Are the equipment and neighboring obstructions dimensioned sufficiently for a working-space review? |
| Special systems boundary | Fire alarm, communications, security, trade scope | Are power and signal handoffs identified without assuming a power note completes the specialist design? |
| Change propagation | Changed load/circuit, panel totals, one-line, study index | Has the responsible engineer identified and checked all downstream and upstream effects of the revision? |
A consistency check can establish that two sources agree. It cannot establish that a protective device, conductor, or available fault-current rating is adequate for the installation.
Trace one load upstream
Select an equipment tag on the power plan. Find its panel and circuit reference, then open the corresponding schedule entry. Compare the load description with the equipment connection data and the panel heading. Continue through the feeder reference to the one-line diagram so the source assignment can be understood.
Read rating labels carefully. A panel’s bus rating, feeder protection, and calculated demand describe different aspects of the design. Their values need not be identical. Record what each value represents and refer unexplained relationships to the electrical engineer instead of calling every numerical difference a conflict.
For lighting, make a second trace through the fixture type, control zone, switching or sensing device, and operating sequence. Where emergency operation is involved, identify the supplied source and described loss-of-power behavior. The team needs a coordinated description before it can verify the design against applicable requirements.
Worked example: one load has two panel assignments
Hypothetical example. The power plan assigns pump P-2 to panel LP-1, circuit 18. LP-1 lists a different load at that circuit, while a pump connection schedule assigns P-2 to MP-1. The current transmittal confirms all three sources are part of the same issue.
P-2 is assigned to LP-1/18 on the power plan and to MP-1 in the connection schedule. LP-1/18 describes another load. Please confirm P-2’s intended supply and update the circuit references, panel entries, and affected load information together.
The electrical engineer decides the supply arrangement; the reviewer should not choose the panel from its name. Once a response is issued, verify the plan tag and both affected panel schedules, including removal of any obsolete entry. Ask the engineer to identify any required upstream calculation or protection review and retain its status in the record.
Backcheck the effects of an equipment change
A new equipment selection can affect several representations even when its tag is unchanged. Review the connection data, circuit entry, panel totals, feeder references, and study inputs identified by the engineer. If a correction changes a room arrangement, revisit working-space information and nearby services.
Use precise statuses: awaiting equipment data, needs designer decision, revised and awaiting backcheck, or resolved with evidence. A response that supplies the missing selection may close the data request while leaving the electrical design check open. The drawing clarification workflow helps turn these dependencies into a clear question and response record.
Review electrical PDFs with source-linked findings
Groundbook reviews supplied electrical drawings alongside equipment schedules, specifications, and uploaded reference documents. Its potential findings can direct the reviewer to conflicting circuit references or equipment descriptions. Qualified professionals verify the sources and the design; AI findings do not certify electrical safety or compliance.
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