Earthing & Bonding Calculator

Calculate minimum CPC, main earthing and bonding conductor sizes per BS 7671

Circuit Details

Line conductor size for CPC calculation

Line Conductor Size

Phase conductor of the circuit

Installation Type

Supply Details

For main bonding calculation

Supply Neutral Size

Incoming supply neutral conductor

Adiabatic Calculation (Optional)

For fault current based CPC sizing

Fault Current (If)

Prospective fault current

Disconnection Time

0.4s for 32A, 5s for distribution

Conductor/Insulation