Transformers, demand, ATS, busbars, power quality, and generators
Transformer Sizing Calculator
Estimate transformer kVA from connected load, demand factor, future growth, loading margin, ambient derating, and standard rating series.
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Power Systems & Distribution
Transformers, demand, ATS, busbars, power quality, and generators
Transformers, demand, ATS, busbars, power quality, and generators
Busbar Current Rating Calculator
Estimate busbar current from width, thickness, material, current-density reference, and derating factor.
Open calculatorTransformers, demand, ATS, busbars, power quality, and generators
ATS Selection Calculator
Select a preliminary ATS current rating, PC or CB class, pole arrangement, transfer-speed category, and UPS or STS requirement.
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Busbar Short-Circuit Force Calculator
Estimate electrodynamic force between parallel busbars from peak short-circuit current, conductor spacing, and unsupported support span.
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Branch Circuit Count Calculator
Estimate branch-circuit quantity from floor area, general load density, circuit voltage and rating, planned loading, dedicated circuits, and optional NEC dwelling circuits.
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Electrical Panel Load and Spare Capacity Calculator
Calculate panel kVA, current, utilization, spare amperes, spare kVA, phase-load unbalance, and expansion impact from entered demand loads.
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Transformer Impedance Calculator
Calculate transformer full-load current, ohmic impedance, R and X components, X/R ratio, and infinite-bus secondary fault current.
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Generator Sizing Calculator
Estimate generator kW and kVA from running load, largest starting step, power factor, reserve, growth, altitude, and ambient derating.
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Harmonic and THD Calculator
Calculate THD, total RMS, individual harmonic distortion, triplen content, crest-factor screen, and neutral-current warning from harmonic magnitudes.
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Maximum Demand and Diversity Calculator
Combine lighting, socket, HVAC, motor, EV, and other loads with demand and simultaneity factors.
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Residential Electrical Load and Service Size Calculator
Estimate dwelling demand, service current, standard service size, spare capacity, and EV charging impact using NEC screening or user-entered demand factors.
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CT Ratio & Burden Calculator
Select a reference current-transformer ratio and calculate secondary lead, meter, relay, and total connected burden for 1 A or 5 A CT circuits.
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