Motor Starting Calculator
IEC 60034 · NEC 430
Motor Nameplate
Rated power
kW
Power unit
Rated voltage
V
Phases
Frequency
Efficiency η
·
Power factor
cos φ
Synchronous speed
rpm
Full-load speed
rpm
Starting Method
Method
Autotransformer tap α
Soft-starter I limit
× FLC
VFD I limit
× FLC
Load & Source
Motor inertia J_m
kg·m²
Load inertia J_L
kg·m²
Load profile
Load T at full speed
N·m
Source SCC
MVA
PCC voltage
V
Allowable Vd
%
Jurisdiction
Advanced
K_LR (× FLC) — optional
× FLC
T_LR / T_rated — optional
·
Service factor — optional
·
IEC design code
NEC code letter
Table 430.250 FLC
A
Nameplate FLA
A
Analysis
solved
IEC 60034-12 · NFPA 70 §430
Document
Audit-ready sheet
Revision History
| Rev | Date | Description | Author | Status |
|---|
Auto-stamped to
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Notes
- Motor performance per IEC 60034-1:2022.
- Locked-rotor current and torque per IEC 60034-12:2016 / NEC Table 430.7(B).
- Voltage dip is a simplified PCC screening — confirm against utility limits and cable-impedance study.
- Acceleration time uses the average-torque method; verify against the manufacturer torque-speed curve and locked-rotor withstand t_E.
References
- — awaiting inputs —
Title Block
Ampacities ·Surry Hills · Sydney
Doc No—
RevA
ScaleN.T.S.
Date—
Drawn
Checked
Approved
Sheet1 of 1
Project
Client