Electrical Calculators
Free BS 7671 compliant calculators for UK electricians
Cable Size Calculator
Calculate the correct cable size for any circuit
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Voltage Drop Calculator
Check voltage drop against BS 7671 limits
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Max Zs Calculator
Maximum earth fault loop impedance values
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Fault Current Calculator
Calculate prospective fault current (PFC)
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Diversity Calculator
Maximum demand after diversity
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Ring Final Calculator
Ring circuit continuity and Zs verification
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Earthing & Bonding
CPC, main earthing and bonding conductor sizes
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Conduit Fill Calculator
Check conduit and trunking cable capacity
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Three Phase Balance
Balance loads across three phases
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EV Charger Calculator
Cable sizing and circuit requirements for EV chargers
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Motor Circuit Calculator
Cable sizing and protection for motor circuits
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Lighting Circuit Calculator
Cable sizing for lighting with inrush current
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Coming Soon
Solar PV Calculator
LED Savings Calculator
Generator Sizing
UPS Sizing