Motor Current, Cable Size & Protection Calculator | Online Electrical Motor Tool

⚡ Electric Motor Calculator

IEEE/IEC Standard Compliant | Professional Engineering Tool

Motor Selection • Cable Sizing • Protection Calculation • Installation Planning

🔧 Motor Specifications

Motor Type Induction Motor (Squirrel Cage) Synchronous Motor DC Motor

Phase Configuration Three Phase (3Φ) Single Phase (1Φ)

Rated Power

kW HP

Rated Voltage (V) 230V (1Φ) 400V (3Φ) 415V (3Φ) 440V (3Φ) 660V (3Φ) 690V (3Φ) Custom...

Frequency (Hz) 50 Hz 60 Hz

Motor Efficiency (%) Typical range: 85-95% (Check motor nameplate)

Power Factor (cos φ) Typical range: 0.8-0.9 for induction motors

Connection Type (3Φ Motors) Star (Y) Connection Delta (Δ) Connection

Rated Speed (RPM) - Optional Leave blank if unknown. Used for slip calculation.

Load Type Light Load (Fans, Blowers) Medium Load (Pumps, Conveyors) Heavy Load (Crushers, Mills)

Duty Type S1 - Continuous Duty S3 - Intermittent Duty

📏 Cable & Installation Parameters

Conductor Material Copper (Cu) Aluminium (Al)

Cable Length (meters)

Installation Method Open Air / Tray Conduit / Duct Concealed / Buried

Ambient Temperature (°C)

Starting Method DOL - Direct Online Star-Delta Starter Soft Starter / VFD

⚡ Electrical Calculations

Full Load Current (FLC)

-

Starting Current (Inrush)

-

Input Power

-

Apparent Power (S)

-

Reactive Power (Q)

-

Full Load Torque

-

Motor Slip

-

🔌 Cable Sizing & Voltage Drop

Recommended Cable Size

-

Cable Current Capacity

-

Voltage Drop

-

Voltage Drop Percentage

-

🛡️ Protection & Control Devices

MCB / MCCB Rating

-

Contactor Rating

-

Overload Relay Setting

-

Fuse Rating (HRC)

-

Earth Cable Size

-

📋 Engineering Assumptions:
• Calculations based on IEEE/IEC standards
• Maximum voltage drop: 5% for motor circuits
• Derating factors applied for ambient temperature
• Protection devices sized per IEC 60947 standards
• Always verify with local electrical codes

⚠️ Professional Use Disclaimer: This calculator is designed for professional electrical engineers. Always verify calculations with manufacturer data and comply with local electrical codes (NEC, IEC, BS, etc.). The author assumes no liability for design decisions based on these calculations.