Calculators & Engineering Engines

Determine minimum required cable current carrying capacity (Iz) applying ambient temperature, grouping, insulation, and protective device derating.

Tabulated maximum earth fault loop impedance (Zs) for MCBs, RCBOs, and fuses with instant 80% temperature correction rule calculation.

Calculate circuit voltage drop from first principles using tabulated mV/A/m values, line length, design current, and power factor cos φ.

Verify circuit protective conductor (CPC) cross-sectional area under fault conditions using adiabatic equations and energy let-through tables.

Size DC conductors for industrial PLC I/O loops, sensors, and 24V field distribution ensuring loop voltage remains above operational dropout thresholds.

Compute full load current (FLC), locked-rotor inrush peaks, and recommended thermal overload / backup fuse ratings across 0.37 kW to 315 kW induction motors.

Calculate reduced starting current, acceleration ramp time, and thyristor heat dissipation for pumps, compressors, and high-inertia conveyors.

Determine minimum standby/prime generator rating factoring in step-loading motor inrush, alternator subtransient reactance (X'd), and voltage dips.

Calculate kilowatt-hour savings, payback periods, and carbon abatement achieved by replacing mechanical dampers and throttling valves with variable speed drives.

Calculate hourly, monthly, and annual operational electricity costs for machinery, motors, and commercial loads with duty-cycle adjustments.

Instantly convert between kW, kVA, horsepower, and phase current for single-phase (230V) and three-phase (400V) systems with power factor compensation.

Searchable database of 40+ classified condition report defect scenarios with 1-click clipboard copy of compliant wording for test certificates.

Instant on-site lookups for BS EN 60529 IP ratings (0-6 / 0-9K), Section 701 Bathroom Zones, Earthing systems (TN-S, PME, TT), and Table 41.1 disconnection times.

A4 print-ready inspection sheets: HSE GS38 10-Step Safe Isolation procedure, Minor Works test schedule, Emergency Lighting 3-hour discharge log, and Motor QC sheet.

Directory of UK statutory enactments (EAWR, PUWER, DSEAR), designated standards (BS EN 60204-1, BS EN 61439), and searchable electrical trade dictionary.