⚡ Earthing Conductor Calculator

⚠️
Professional Use Only
For qualified electricians. Always verify with local regulations and manufacturer specifications.

📋 Calculation Parameters

⚡ Fault Characteristics
A
s
Note: Use actual measured PFC or calculated based on transformer impedance and circuit length
🔩 Conductor Specifications
k-factor
Based on: Initial temp=30°C, Final temp=160°C (Cu) or 140°C (Al)
🏗️ Installation Factors

📊 Calculation Results

Minimum Cross-Sectional Area
0.00 mm²
Copper conductor at k=115
📏 IEC Standard Sizes
Select nearest standard size above
🧮 Calculation Details
S = I × √t ÷ k
Enter values to see calculation

📚 Standards Comparison

Standard Formula k (Copper) k (Aluminium) Notes
IEC 60364-5-54 S = I × √t ÷ k 115 76 PVC insulated, 30→160°C
BS 7671 (UK) S = I × √t ÷ k 115 76 Table 54.3
AS/NZS 3000 (AUS/NZ) S = I × √t ÷ k 115 76 Table 5.1
NEC 250 (USA) Table 250.66 - - Based on service conductors

📝 Professional Notes & Considerations

⚡ Fault Current Source
  • Measure prospective fault current at origin
  • Consider transformer impedance and cable length
  • For motors, include contribution during fault
  • Maximum fault level = transformer PFC + motor contribution
🔧 Installation Factors
  • Apply grouping factors for multiple circuits
  • Consider thermal insulation derating
  • Check termination temperature ratings
  • Verify mechanical strength requirements
📋 Verification Checklist
  • Compare with local regulations
  • Check equipment manufacturer requirements
  • Verify conductor withstand rating
  • Document calculations for inspection