What does a manufacturer example establish?
Schneider Electric's MasterPacT NT and NW catalog distinguishes frame sizes, sensor plugs and adjustable rating plugs. In that family, the sensor plug determines a maximum trip rating and the adjustable rating plug is used to select the long-time pickup. The catalog states that ordering uses the sensor-plug rating rather than the ampere trip rating.
These are family-specific distinctions, not a universal construction rule for every breaker. Critical Power Drafting is independent and is not affiliated with Schneider Electric. No field adjustment or equipment substitution is authorised here.
Sources: Schneider Electric: MasterPacT NT and NW Catalog 0613CT0001: Selection, checked 23 October 2026
How can one ampere field create ambiguity?
Illustrative example. A fictional one-line schedule contains one column called Amps. One source fills it with a frame value while another uses an approved long-time setting. Merging the rows as if they describe the same quantity hides the difference even if the numerical entries happen to match.
Retain the source labels before resolving the schedule. A drafter should flag the undefined field for the responsible engineer rather than select whichever number fits the available column.
What should the drawing reconciliation record contain?
Use the actual product nomenclature. Do not force a sensor-plug field onto equipment that uses a different arrangement.
| Field | Evidence to retain |
|---|---|
| Equipment identity | Exact breaker model and manufacturer revision |
| Frame | Manufacturer frame designation and rating basis |
| Sensor | Applicable sensor or sensor-plug reference |
| Trip unit | Selected unit and function reference |
| Rating plug | Applicable plug and configuration reference |
| Approved settings | Controlled setting record and revision |
| Conflict | Drawing, schedule and equipment evidence requiring review |
Who closes a mismatch?
The responsible protection and equipment owners establish the accepted configuration and settings through the project process. The drawing issue should identify their controlled evidence and retain the superseded reference. A corrected drawing does not itself prove the equipment was configured or tested accordingly.
Keep interrupting capability, voltage and installation suitability as separately reviewed characteristics. This worksheet neither calculates coordination nor approves a protection setting. Engineering sign-off is performed only by the registered engineer on the job.
Common questions
What else should the bid team know?
Can a frame value be copied into the trip-setting field?
Only when the responsible engineer has established the actual approved value and its meaning, not merely because the frame is known.
Does every breaker use a replaceable sensor plug?
No. Use the selected manufacturer and equipment-family documentation.
Does an updated schedule prove a field setting?
No. Retain the separate equipment verification evidence.