Which current should be stronger in the record?

Use manufacturer nameplate current where it applies to the actual motor. The calculated current remains useful when the source and assumptions need to stay visible.

Why compare against calculated current?

The comparison exposes whether the formula basis, voltage, power factor, efficiency or copied nameplate value needs another look.

What does the tolerance mean?

Tolerance is entered by the user as a project comparison value. The calculator does not create the criterion.

Can this set an overload?

No. It only compares current values. Overload work needs device data, manufacturer instructions and project requirements.

What should stay with the export?

Keep the calculated-current source, nameplate source, entered tolerance, review current and unresolved product checks with the record.

Motor nameplate comparison calculator

Idiff = Inameplate - Icalc; Iabs = abs(Idiff); diff_% = abs(Idiff) / Icalc x 100; Ireview_margin = Ireview - Inameplate

Calculated current and nameplate current are entered values.
Difference percent is measured against the entered calculated current.
Review current is optional and should be used only when a real comparison value exists.
Manufacturer nameplate data and project documentation remain stronger than a formula estimate.

Formula variables
Variable	Meaning	Unit	Use
Icalc	Calculated current	A	Current from a motor-current calculator, schedule, measurement record or other documented basis.
Inameplate	Nameplate current	A	Current entered from motor nameplate or manufacturer data.
Idiff	Nameplate difference	A	Nameplate current minus calculated current.
Iabs	Absolute difference	A	Absolute value of the nameplate difference.
diff_%	Difference percent	%	Absolute difference divided by calculated current times 100.
Ireview	Review current	A	Optional entered comparison current.
Ireview_margin	Review margin	A	Review current minus nameplate current.

Motor nameplate comparison calculator technical guide

Compare calculated motor current with entered nameplate current and tolerance for Australian motor schedule review.

Use this page when a motor record already has both a calculated current basis and an entered nameplate current. The calculator shows the ampere spread and percent difference so the current record can be reviewed before it moves into load, cable, starter or protection work.

The result is a comparison record. It does not replace manufacturer data, select a motor, select protection, set overloads or close project documentation.

Field use cases

Practical nameplate comparison use cases
Work setting	Real question	Useful action from this page
Motor schedule review	Does the entered nameplate current line up with the current estimate?	Compare both values and keep the source of each value visible.
Replacement motor record	Is the new motor current materially different from the old schedule value?	Record the spread before reusing downstream assumptions.
Maintenance note	Was a copied nameplate value entered against the right motor reference?	Use the motor reference and difference percent as a traceable check.
Cable or starter handoff	Which current should travel into the next worksheet?	Carry the nameplate and calculated basis together rather than a bare ampere value.

The comparison is strongest when both values are traceable. A current copied from an unknown schedule and a nameplate value copied without a motor reference can create false confidence.

Nameplate boundary

What the worksheet includes and excludes
Area	Included here	Kept outside this page
Calculated current	Entered current from a formula, schedule or record.	Recalculating output kW, efficiency or power factor.
Nameplate current	Entered manufacturer or nameplate value.	Verifying product listing or motor suitability.
Tolerance	User-entered comparison percentage.	A standard-derived acceptance value.
Review current	Optional project comparison current.	Device setting, cable loading or starter selection.

Manufacturer nameplate data, project specifications, current standards, local authority requirements, DNSP conditions and equipment instructions can override the comparison record.

Result interpretation

Reading the nameplate comparison
Result state	What it means	Practical response
Within entered tolerance	The nameplate current is within the entered comparison band.	Keep both source values with the record before handoff.
Review nameplate difference	The spread is above the entered tolerance or review current.	Recheck calculated-current basis, voltage, PF, efficiency, copied nameplate value and product data.
No review current	Only nameplate and calculated current are being compared.	Add a review current only when a real project value exists.

The result should help the next reviewer see why one current value is being used. It should not hide the source by reducing the record to one number.

Formula basis

The comparison uses entered current values:

Idiff = Inameplate - Icalc
Iabs = abs(Idiff)
diff_% = abs(Idiff) / Icalc x 100

Where a review current is entered:

Ireview_margin = Ireview - Inameplate

The formula does not create the nameplate value, calculated-current source or tolerance.

Worked records

Nameplate comparison examples
Recorded situation	Calculation basis	Example result	Follow-up supported
Pump comparison	14.4 A calculated current and 15.2 A nameplate current with 10 percent tolerance.	Difference is 0.8 A, about 5.56 percent.	Carry both values forward with the source basis.
Fan comparison	28 A calculated current and 26.9 A nameplate current with 5 percent tolerance.	Difference is about 3.93 percent.	Keep the comparison record without adding a review current.
Replacement motor review	14.4 A calculated current and 17.5 A nameplate current with 10 percent tolerance.	Difference is above the entered tolerance.	Recheck the copied current, motor data and downstream assumptions.

Australian context

The page uses Australian 230/400 V, 50 Hz motor-circuit context, metric records and local project terminology. It names AS/NZS 3000 only as installation context and does not reproduce controlled standard tables or motor product data.

For imported equipment, replacement motors, VSD-fed motors, high-inertia loads and unusual duty, the nameplate comparison can be only one record in a wider review. Keep source documents close to the exported result.

Stop points

The motor reference cannot be matched to a schedule, asset, drawing, circuit label or nameplate.
The calculated-current source is unknown.
The entered nameplate current may belong to a different motor or voltage rating.
The difference is being copied into cable, starter or overload work without source review.
Manufacturer data or project documentation conflicts with the entered value.

Motor reference: PMP-NP-1
Calculated current: 14.4 A
Nameplate current: 15.2 A
Entered tolerance: 10%
Review current: 16 A

Ampere difference0.8 A
Absolute difference0.8 A
Difference percent5.56%
Review margin0.8 A

Nameplate current difference5.56%

Carry the nameplate comparison forward with the current basis.

The nameplate current is within the entered tolerance. Keep the calculation basis and nameplate source with the record.

Calculated current and nameplate current are entered by the user.
Tolerance is an entered project comparison value.
Review current is optional and entered separately.

Motor reference: FAN-NP-2
Calculated current: 28 A
Nameplate current: 26.9 A
Entered tolerance: 5%
Review current: Not entered

Ampere difference-1.1 A
Absolute difference1.1 A
Difference percent3.93%

Nameplate current difference3.93%

Carry the nameplate comparison forward with the current basis.

The nameplate value is within the entered tolerance. Add a review current only when a real comparison value exists.

No review current was entered.
The tolerance is entered by the user.
The comparison does not change the nameplate record.

Motor reference: MTR-NP-9
Calculated current: 14.4 A
Nameplate current: 17.5 A
Entered tolerance: 10%
Review current: 17 A

Ampere difference3.1 A
Absolute difference3.1 A
Difference percent21.53%
Review margin-0.5 A

Nameplate current difference21.53%

The comparison needs review against the entered tolerance or review current.

The difference is above the entered tolerance and the nameplate current is above the entered review current, so the record needs review.

The nameplate current is entered from source data.
The review current is an entered comparison value.
Manufacturer data remains the stronger project input.