Earthing Strip Size Calculator
Calculate minimum earthing strip cross-sectional area for fault current protection
Earthing Strip Size Calculator
Compliant with IEC 60364 Standards
Results:
Minimum Cross-Sectional Area: 0.00 mm²
Recommended Area (Safety Factor 1.25): 0.00 mm²
Equivalent Strip Dimensions: -
How to Use the Calculator
Step 1: Fault Current
- Determine maximum fault current
- Use system short-circuit analysis
- Consider worst-case scenario
- Enter value in amperes
Step 2: Fault Duration
- Determine protection clearing time
- Include relay and breaker operation
- Consider backup protection time
- Enter value in seconds
Step 3: Material Selection
- Choose conductor material
- Copper: k = 159 (most common)
- Aluminum: k = 101
- Steel: k = 78
Earthing Strip Fundamentals
Purpose
Earthing strips provide:
- Safe fault current path to ground
- Equipment potential equalization
- Personnel safety protection
- System reference point
Design Considerations
- Fault current magnitude and duration
- Material thermal characteristics
- Corrosion resistance requirements
- Mechanical strength needs
Key Formula:
S = √(I² × t) / k
Where: S = Area (mm²), I = Fault Current (A), t = Time (s), k = Material Constant
Calculation Formula
Earthing Strip Cross-Sectional Area:
S = √(I² × t) / k
Where:
S = Cross-sectional area (mm²)
I = Fault current (A)
t = Fault duration (s)
k = Material constant
Example Calculation
Copper Earthing Strip:
Fault Current: 10,000A
Fault Duration: 1.0s
Material: Copper (k = 159)
S = √(10000² × 1.0) / 159
S = √(100,000,000) / 159
S = 10,000 / 159 = 62.89 mm²
Recommended: 62.89 × 1.25 = 78.61 mm²
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