Wire Size Calculator
Calculate the correct wire gauge for your electrical projects. Understand how current, voltage, distance, and installation type affect wire size selection and safety.
Step 1: Electrical Parameters
Understanding Current Requirements
The current (amps) is the most critical factor in wire sizing. Higher currents require thicker wires to prevent overheating and voltage drop. Always check your device specifications for current requirements.
Step 2: Installation Details
About Voltage Drop
Voltage drop is the reduction in voltage as electricity travels through a wire. Excessive voltage drop can cause equipment to malfunction. For most applications, a voltage drop of 3% or less is recommended.
Wire Size Results
Recommended Wire Size
Wire Gauge Comparison
| Wire Gauge (AWG) | Diameter (mm) | Cross-Section (mm²) | Max Current* | Resistance (Ω/1000ft) |
|---|
*Maximum current for copper wire in free air at 30°C
Ampacity Analysis
Wire Sizing Formula
Wire Size = f(Current, Distance, Voltage, Material, Installation)
Wire size is determined by calculating the minimum gauge that can handle the required current without excessive voltage drop or overheating, considering material resistivity, installation type, and insulation temperature rating.
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