This application is a calculation aid. Verify results against the applicable NEC edition, equipment instructions, local amendments, and the Authority Having Jurisdiction (AHJ).
Pricing
Each plan unlocks a different set of calculators. Pay yearly and the effective monthly rate drops.
Basic
$10 / month
or $8/month billed yearly ($96 total per year)
Includes 8 calculators:
- Voltage Drop
- Continuous Load (125%)
- Box Fill
- Energy Cost Estimator
- Conductor Ampacity & Derating
- Load Current & Power
- HP, Amps & Power Converter
- Standard Overcurrent Device
Standard
$15 / month
or $12/month billed yearly ($144 total per year)
Includes 22 calculators:
- Voltage Drop
- Conductor Ampacity & Derating
- Continuous Load (125%)
- Energy Cost Estimator
- Standard Overcurrent Device
- HP, Amps & Power Converter
- Load Current & Power
- Medium Voltage Cable Ampacity
- Box Fill
- Pull & Junction Box Sizing
- Conduit Fill
- Dwelling Service Load
- Equipment Grounding Conductor
- Grounding Electrode Conductor
- Transformer Overcurrent Protection
- EV Supply Equipment Circuit
- PV Maximum Circuit Current
- PV Maximum System Voltage
- PV String Sizing
- PV Conductor Sizing
- Transformer Current
- Load-Side Interconnection
Pro
$25 / month
or $22/month billed yearly ($264 total per year)
Includes 32 calculators:
- Voltage Drop
- Conductor Ampacity & Derating
- Medium Voltage Cable Ampacity
- Wire Ampacity Reference
- Continuous Load (125%)
- Conduit Fill
- Box Fill
- Pull & Junction Box Sizing
- Dwelling Service Load
- Feeder & Branch-Circuit Load
- Panel Schedule Builder
- Energy Cost Estimator
- Standard Overcurrent Device
- Equipment Grounding Conductor
- Transformer Overcurrent Protection
- HVAC Circuit Ampacity & Protection
- EV Supply Equipment Circuit
- Motor Branch Circuit
- Group Motor Branch-Circuit Protection
- HP, Amps & Power Converter
- PV Maximum System Voltage
- PV Maximum Circuit Current
- PV String Sizing
- PV Overcurrent Device
- Inverter Output Circuit
- Load Current & Power
- Battery Backup Runtime
- Required PV Labels
- Rapid Shutdown Checklist
- PV Equipment Grounding Conductor
- Supply-Side Interconnection
- Transformer Current
Fancy
$35 / month
or $32/month billed yearly ($384 total per year)
Includes 41 calculators:
- Voltage Drop
- Conductor Ampacity & Derating
- Medium Voltage Cable Ampacity
- Wire Ampacity Reference
- Copper vs. Aluminum
- Continuous Load (125%)
- Conduit Fill
- Raceway Sizing
- Box Fill
- Generator Sizing
- Feeder & Branch-Circuit Load
- Optional Dwelling Load
- Dwelling Service Load
- Pull & Junction Box Sizing
- Energy Cost Estimator
- Panel Schedule Builder
- Multiple-Motor Feeder
- Motor Branch Circuit
- EV Supply Equipment Circuit
- HVAC Circuit Ampacity & Protection
- Transformer Overcurrent Protection
- Grounding Electrode Conductor
- Equipment Grounding Conductor
- Standard Overcurrent Device
- Supply-Side Interconnection
- Feeder Tap Interconnection
- Load-Side Interconnection
- Inverter Output Circuit
- PV String Sizing
- PV Conductor Sizing
- HP, Amps & Power Converter
- PV Maximum System Voltage
- Group Motor Branch-Circuit Protection
- PV Maximum Circuit Current
- PV Overcurrent Device
- PV Equipment Grounding Conductor
- Rapid Shutdown Checklist
- Transformer Current
- Load Current & Power
- Battery Backup Runtime
- Required PV Labels
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