Last two values you type are inputs. Every other field that can be calculated updates live. Edit a highlighted field to cross-check.

Motor Circuit (MCA / MOP)

Enter any nameplate value. FLA and RLA are the same running amps. Last values you type stay put; the rest fill live. Wire is sized at 80% of the breaker (15 A → #12).

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VFD / Motor Starters

Placeholder — this step will cover field troubleshooting for VFDs, three-phase / engineered capacitors, and motor starters. No calculator on this pass.

• VFD troubleshooting — fault codes, input/output voltage, carrier vs line, bypass.
• Three-phase capacitors — PF correction is engineered; not start/run µF from HP.
• Motor starters — across-the-line (DOL), star-delta, soft start vs VFD.

3-Phase Power

Power factor

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Wye / Delta Voltage

Vdelta = Vy / sqrt(3); Vy = Vdelta * sqrt(3). NA: 347 V = one leg of 600Y.

Direction

Wye to Delta (div sqrt3) Delta to Wye (x sqrt3)

Wire temp rating

75 C 60 C

Inrush current not used for breaker or wire sizing. Use nameplate LRA when available.

Enter as

FLA (full load amps) HP (horsepower)

Enter as

Total watts Total amps

Leave blank for zero

Reference only - verify with manufacturer data

OR total power (kW) - overrides above

Load type

Full load Part load (real-world)