Ampacity Calculator
Calculate the ampacity (current-carrying capacity) of electrical wires. Determine safe current limits based on wire size, insulation type, and installation conditions.
Step 1: Wire Specifications
Understanding Ampacity
Ampacity is the maximum current a wire can carry without exceeding its temperature rating. It depends on wire size, material, insulation type, and installation conditions.
Step 2: Environmental Factors
Temperature & Derating Factors
Higher ambient temperatures reduce ampacity. Multiple conductors in close proximity also require derating due to reduced heat dissipation.
Ampacity Calculation Results
Maximum Safe Current
Wire Size Comparison
| Wire Size | Copper Ampacity | Aluminum Ampacity | Voltage Drop/100ft |
|---|
Ampacity Derating Factors
Ampacity Formula
Adjusted Ampacity = Base Ampacity × Temperature Factor × Conductor Factor × Safety Factor
Base ampacity depends on wire size and material. Temperature and conductor count factors are applied based on NEC tables. Always consult local electrical codes for final values.
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