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.

Calculate minimum steel/PVC conduit diameter (straight runs or 1 to 3 bends) and trunking space factor (45% capacity) for mixed cable singles under BS 7671 Appendix 5.

Calculate domestic and commercial maximum demand applying IET On-Site Guide Table A1 diversity rules, DNO cut-out headroom (60A/80A/100A), and 60A continuous load limits.

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

Calculate minimum circuit protective conductor (CPC) sizing via Table 54.7 and adiabatic equation, plus main protective bonding for PME (Table 54.8) and TN-S/TT installations.

Verify 100% continuous duty EV cable sizing, volt drop, and broken supply PEN touch voltage to evaluate Reg 722.411.4.1 compliance and O-PEN device selection.

Interactive step-by-step troubleshooting decision tree for GS38 safe isolation, RCD nuisance tripping, high loop impedance, neutral-earth faults, and motor thermal overload.

High-contrast, plant-room offline quick reference for site sparks: instant 80% Max Zs lookup, cable current capacity, and BPG 4 EICR defect coding.

Calculate neutral conductor heating, Table 4A3 derating factor Ch, and shift sizing bottlenecks to the neutral conductor under non-linear loads.

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 1 MW generator step-loading, voltage dips, earth cable sizing (BS 7671 Table 54.7), starter torque curves, and circuit discrimination.

Size Direct-On-Line contactors (AC-3/AC-3e), thermal overloads, BS 88-2 gM fuses, BS 7671 feeder cables, and BS EN 61439-2 Form 4 MCC starter buckets.

Calculate starting inrush current, cable voltage drop, and starting torque reduction across DOL, Star-Delta, Soft-Starter, and VFD regimes.

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

Calculate incident energy (cal/cm²), arc flash boundary, and BS EN 61482-1-1 ELIM/ATPV protective clothing tiers for 400V and 11kV switchgear.

Calculate IEC 60255 IDMT relay tripping times (SI, VI, EI) and verify the 0.35s discrimination grading margin between 11kV relays and 400V incomers.

Evaluate required Performance Level (PLr) via the ISO 13849-1 risk graph and verify achieved PL across Categories B-4, MTTFd, and DCavg.

Calculate minimum safety distances for optical light curtains, two-hand controls, and perimeter barrier reach-over distances.

Model dynamic EV fleet curtailment waterfalls, building supply headroom, and phase balancing under BS 7671 Section 722.

Size commercial solar arrays and BESS storage for EV fleets. Classify statutory DNO pathways (G98 vs G99) and G100 export schemes.

Determine whether UK solar PV and battery storage qualifies for G98 Fit & Notify or requires G99 prior approval. Evaluates AC coupling, hybrid inverters, and G100 export limit.

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

Calculate harmonic distortion, BS 7671 Table 4Aa triplen neutral sizing, PFC parallel resonance risk, and ENA EREC G5/5 Stage 1 compliance.

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.