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Dwelling Service Load Calculator
Residential service size by NEC 220.82: general load with demand plus larger HVAC. 5 inputs, 4 outputs with grouped results.
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Electrical calculators
Load and power, wire and voltage drop, motors and protection, 24V control power, heat, lighting, backup, and raceway, each with visible math.
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Battery Charger Sizer
Charger amps from amp-hours, recharge window, and concurrent load. 4 inputs, 2 outputs with grouped results.
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Cable Tray Fill Calculator
Tray fill per NEC 392: allowable area, cable area used, and the fill verdict. 5 inputs, 4 outputs with grouped results.
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Arc Flash Incident Energy Screening
First-pass incident energy and flash boundary from fault current, clearing time, and distance. 5 inputs, 3 outputs with grouped results.
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Harmonic Neutral Sizer
Neutral ampacity for nonlinear loads with the 200% neutral call. 3 inputs, 3 outputs with grouped results.
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VFD Input Current and Line Reactor Check
Drive input current from motor HP with efficiency, feeder at 125%, and the reactor call. 5 inputs, 3 outputs with grouped results.
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Feeder Tap Rule Checker
NEC 240.21 tap screening: 10-ft and 25-ft rules from length, size ratio, and termination OCPD. 5 inputs, 3 outputs with grouped results.
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Equipment Grounding Conductor Sizer
EGC size from the upstream OCPD per NEC Table 250.122, copper or aluminum. 3 inputs, 2 outputs with grouped results.
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Enclosure Ventilation Fan Sizer
Cooling airflow for control panels: CFM from internal watts and allowed rise, with filtered-fan derate. 4 inputs, 3 outputs with grouped results.
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Control Transformer VA Sizer
Control power transformer VA per NEC 450: inrush plus sealed burden stepped to a standard CPT size. 5 inputs, 4 outputs with grouped results.
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