Electrical Circuit Calculator
NEC 2023 Compliant Calculations with Full Data Tables
Three Phase Circuit Calculations
- Enter circuit parameters directly in the spreadsheet - calculations update automatically
- Use toolbar buttons to manage multiple circuits
- Download template to prepare data in Excel, then import
- All calculations follow NEC 2023 standards
| Circuit Name | Current (A) | Distance (ft) | Voltage (V) | Conductor Type | Conduit Type | Temp (°C) | Conductor Size | Voltage Drop (V) | VD % | Conduit Size | Breaker Size (A) | Ground Size | Notes |
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Single Phase Circuit Calculations
- Enter circuit parameters directly in the spreadsheet - calculations update automatically
- Use toolbar buttons to manage multiple circuits
- Download template to prepare data in Excel, then import
- All calculations follow NEC 2023 standards
| Circuit Name | Current (A) | Distance (ft) | Voltage (V) | Conductor Type | Conduit Type | Temp (°C) | Conductor Size | Voltage Drop (V) | VD % | Conduit Size | Breaker Size (A) | Ground Size | Notes |
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NEC Data Tables Management
- Edit NEC tables directly - changes affect all calculations immediately
- Use row actions to enable/disable, delete, or drag to reorder rows
- Add new rows to customize tables for your specific needs
- All changes are automatically saved in your browser
Conductor Ampacity - NEC Table 310.15(B)(16)
| # | Size | Type | 60°C (A) | 75°C (A) | 90°C (A) | Actions |
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Equipment Grounding Conductors - NEC Table 250.122
| # | OCPD (A) | Copper (AWG) | Aluminum (AWG) | Actions |
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Standard Breaker Sizes - NEC 240.6(A)
| # | Size (A) | Type | Application | Actions |
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Conductor Properties
| # | Size | Area (cmil) | Diameter (in) | Area (in²) | Actions |
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Conduit Fill Capacity (EMT)
| # | Conduit Size | Area (in²) | 1 Wire % | 2 Wires % | Actions |
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Temperature Derating Factors
| # | Temp (°C) | Temp (°F) | Derating Factor | Application | Actions |
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