⚡ Earthing Conductor Calculator
⚡ Earthing Conductor Calculator
Size earthing conductors for fault protection. For qualified electricians — always verify with local regulations.
📋 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
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