Panel MCCB & Cable Sizing Calculator

Panel MCCB, Cable & Busbar Sizer

System Voltage Type: 415V, Three Phase (Standard Panel) 230V, Single Phase (Sub-Panel)

Connected Load Capacity (kW):

Operating Power Factor (cos phi):

Diversity / Demand Factor:

System Fault Level (kA):

Busbar Material: Aluminum (Standard Panels) Copper (Premium Panels)

Panel Sizing Results

Design Load Current (Ib): 0.0 Amps

Min. Protected Current (1.25 x Ib): 0.0 Amps

Recommended Standard MCCB Rating

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Aluminum Cable

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Copper Cable

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Recommended Busbar Sizing

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CPWD & IEC Coordinated Sizing Notes:

• MCCB Sizing: Sized at a minimum of 125% of the continuous design load current (Ib) to prevent thermal tripping inside unventilated enclosures as per the National Electrical Code of India.
• Feeder Cable (Runs): For MCCB ratings above 250A, options for both a single heavy run and two parallel smaller runs are provided. Paralleling cables is a standard field practice to facilitate easier cable laying and termination within limited panel spaces.
• Busbar Sizing: Compares the cross-sectional area needed for continuous loading (Aluminum = 0.8 A/sq.mm, Copper = 1.2 A/sq.mm) vs. short-circuit limits using the **IEC 60949** adiabatic formula (1.0 sec duration).