Calculation Results

Recommended Cable Size: -

Current Carrying Capacity: - A

Voltage Drop: - V (-%)

Power Loss: - W

Derating Factor: -

Short Circuit Capacity: - kA

Voltage Drop Visualization
Calculation Details

The cable size is determined based on:

  • Current carrying capacity requirements
  • Allowable voltage drop (typically limited to 5% or less)
  • Short circuit withstand capacity (if selected)
  • Derating factors for installation conditions

The calculation follows IEC 60364-5-52 and BS 7671 standards.

Voltage drop occurs due to the resistance of the cable and is calculated using:

Voltage Drop = (I × R × L × √3) / 1000 (for three phase)

Voltage Drop = (I × R × L × 2) / 1000 (for single phase)

Where:

  • I = Current (A)
  • R = Resistance (Ω/km)
  • L = Length (m)

Derating factors account for conditions that reduce a cable's current carrying capacity:

  • Ambient Temperature: Higher temperatures reduce capacity
  • Cable Grouping: Multiple cables together increase temperature
  • Installation Method: Buried or insulated cables have different heat dissipation
  • Harmonics: Non-linear loads can increase heating