Electrical circuit schedule load tally
User-supplied measurements and assumptions; Sum connected loads; apply each supplied demand factor before summing.
Electrical project estimating ↗Electrical project estimating calculators
25 calculators. Search or choose one below.
Calculators
Electrical phase load balancing
User-supplied measurements and assumptions; Exhaustively enumerate up to 12 load phase assignments, preserve fixed phases, respect limits and minimize max−min phase load; lexicographic tie break.
Electrical project estimating ↗Electrical conduit fill worksheet
User-supplied measurements and assumptions; Cable area sum / conduit inside area; compare with user-selected fill fraction.
Electrical project estimating ↗Electrical cable tray occupancy
User-supplied measurements and assumptions; One linear cable layer; sum diameters plus gaps between adjacent cables.
Electrical project estimating ↗Electrical first-fit cable drum cuts
User-supplied measurements and assumptions; First-fit whole-run cuts in supplied order including one entered allowance per run; failure means this heuristic cannot allocate, not proof of global infeasibility.
Electrical project estimating ↗Electrical conductor ampacity derating
User-supplied measurements and assumptions; Adjusted rating = published base rating × all supplied multiplicative correction factors.
Electrical project estimating ↗Electrical protective-device margin
User-supplied measurements and assumptions; Check entered nominal relationship design current ≤ device rating ≤ adjusted conductor rating; no full protection coordination.
Electrical project estimating ↗Electrical short-circuit thermal worksheet
User-supplied measurements and assumptions; Adiabatic equation S=I√t/k using supplied coefficient; constant RMS fault current assumed.
Electrical project estimating ↗Electrical fault loop impedance worksheet
User-supplied measurements and assumptions; Add resistive and reactive components separately; divide supplied driving voltage by complex-impedance magnitude.
Electrical project estimating ↗Electrical earth electrode parallel model
User-supplied measurements and assumptions; Ideal independent parallel resistances; real mutual soil coupling is not modeled.
Electrical project estimating ↗Electrical RCD test log summary
User-supplied measurements and assumptions; Compare each supplied measurement with its matching supplied limit; does not certify device type or installation.
Electrical project estimating ↗Electrical insulation reading margins
User-supplied measurements and assumptions; Compare circuit readings with entered minimums; ordered positions identify records needing review.
Electrical project estimating ↗Electrical lighting fixture count worksheet
User-supplied measurements and assumptions; Lumen method N=ceil(area×target/(lumens×utilization×maintenance)); no uniformity/glare or layout calculation.
Electrical project estimating ↗Electrical emergency lighting test duration
User-supplied measurements and assumptions; Elapsed minus required duration; failed devices/tested devices.
Electrical project estimating ↗Electrical distribution diversity scenario
User-supplied measurements and assumptions; Sum load×coincidence for independently supplied group factors; no standard default diversity tables.
Electrical project estimating ↗Electrical UPS autonomy from curve
User-supplied measurements and assumptions; Piecewise-linear runtime interpolation within supplied curve; reserve is an explicit percentage deduction.
Electrical project estimating ↗Electrical UPS addition load budget
User-supplied measurements and assumptions; Accumulate scheduled additions and flag first period above entered load cap.
Electrical project estimating ↗Electrical generator load-step worksheet
Sequential kW arithmetic; does not model frequency/voltage dip, kVA, harmonics or generator dynamic response.
Electrical project estimating ↗Electrical power factor capacitor estimate
User-supplied measurements and assumptions; Qc=P(tan acos(PFold)−tan acos(PFtarget)); ideal balanced three-phase capacitor bank, no resonance or switching design.
Electrical project estimating ↗Electrical transformer load cycle
User-supplied measurements and assumptions; Weight load and squared load by segment durations; no transformer thermal aging model.
Electrical project estimating ↗Electrical harmonic RMS aggregation
User-supplied measurements and assumptions; Orthogonal harmonic RMS components combine by root-sum-square; THD excludes the fundamental in numerator.
Electrical project estimating ↗Electrical same-frequency neutral phasor sum
One frequency at a time; phase angles are supplied explicitly.
Electrical project estimating ↗Electrical panel spare-way planning
User-supplied measurements and assumptions; Sum existing and planned modular widths; subtract from panel ways, then deduct reserve.
Electrical project estimating ↗Electrical test instrument calibration calendar
User-supplied measurements and assumptions; Add prescribed calendar-day calibration intervals; due date itself is not yet overdue.
Electrical project estimating ↗Electrical certificate evidence coverage
User-supplied measurements and assumptions; Summarize missing required evidence cells only; no certificate is issued and entered test results are not assessed.
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