1. What is the Wire Size Calculator for 24kW Generator?

Definition: This calculator determines the appropriate wire size (in mm²) needed for a 24kW generator installation based on current, distance, and electrical properties.

Purpose: Helps electricians and DIYers select the correct wire gauge to ensure safe and efficient power transmission from generator to load.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( A_w \) — Wire cross-sectional area (mm²)
• \( I \) — Current (amps)
• \( L \) — Length of wire (feet)
• \( K \) — Correction factor (12.9 for copper)
• \( V_{drop} \) — Acceptable voltage drop (volts)
• \( \sigma \) — Conductivity of material (Ω⁻¹·mm²/m)

Explanation: The formula calculates the minimum wire size needed to maintain voltage drop within acceptable limits for a given current over a specific distance.

3. Importance of Proper Wire Sizing

Details: Correct wire sizing prevents overheating, maintains voltage stability, ensures safety, and meets electrical code requirements.

4. Using the Calculator

Tips:

• For 24kW 3-phase: I ≈ (24 × 1000)/(V × PF × √3)
• Default K=12.9 for copper (use 21.2 for aluminum)
• Typical V_drop=3V for circuits
• Copper σ=58, Aluminum σ=35

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate current for a 24kW generator?
A: For 3-phase: I = (24,000)/(V × 0.8 × 1.732). For 240V this is about 72A.

Q2: What's the maximum voltage drop allowed?
A: NEC recommends ≤3% of circuit voltage (3.6V for 120V, 7.2V for 240V).

Q3: When would I use aluminum instead of copper?
A: For longer runs where cost is a factor, but aluminum requires larger gauge.

Q4: How does wire length affect size?
A: Longer runs require larger wire to maintain the same voltage drop.

Q5: What's the safety factor for generator wiring?
A: Size wire for 125% of continuous load current (NEC 445.13).