Tools
Quote & bill
Certificates · Electrical installation
Certificates · Testing
Certificates · Fire and safety
Certificates · Renewables and EV
EV charger
EV charging installation certificate (BS 7671 + IET Code of Practice).
Solar PV
Solar photovoltaic installation certificate — DC string tests, inverter, MCS & DNO refs.
Battery storage
Electrical energy storage system certificate — capacity, chemistry, location & protection.
G98/G99 DNO notification
Notify the DNO of a generator / storage connection under EREC G98 / G99.
Testing
Calculators
Cable size
Design current + correction factors (grouping · ambient · insulation) → cable CSA.
Voltage drop
mV/A/m × length × current → voltage-drop % against the limit.
Max Zs
Max permitted earth-loop impedance for a device type + rating (compare to measured).
Adiabatic
√(I²t) ÷ k → minimum CPC size for the fault current.
Conduit & trunking fill
Cable cross-section against the containment space factor.
Load / diversity
Connected load × diversity → assessed maximum demand.
R1+R2 expected
Expected R1+R2 from conductor size + length to sanity-check test results.
RCD disconnection time
Max permitted disconnection times for an RCD type at IΔn.
Lighting (lux / lumen)
Lumen method: lux × area ÷ (lumens × UF × MF) → fittings + spacing.