1. What is the 100 Amp Wire Gauge Calculator?

The 100 Amp Wire Gauge Calculator determines the appropriate wire size (AWG) needed for a 100 amp electrical service based on the length of the run and the conductor material (copper or aluminum).

2. How Does the Calculator Work?

The calculator uses standard wire sizing tables:

Where:

• 100A — 100 amp service
• Length — Distance in feet from panel to load
• Material — Copper or aluminum conductor

Explanation: The calculator references National Electrical Code (NEC) tables to determine the minimum wire size that can safely carry 100 amps over the specified distance with acceptable voltage drop.

3. Importance of Proper Wire Sizing

Details: Correct wire sizing is critical for electrical safety. Undersized wires can overheat, causing fire hazards, while oversized wires are unnecessarily expensive and difficult to work with.

4. Using the Calculator

Tips: Enter the total one-way length of the circuit in feet and select the conductor material. The calculator will recommend the appropriate wire gauge for 100 amp service.

5. Frequently Asked Questions (FAQ)

Q1: Why does wire gauge change with length?
A: Longer wire runs have higher resistance, requiring larger conductors to maintain acceptable voltage drop (typically 3% or less).

Q2: What's the difference between copper and aluminum?
A: Aluminum has higher resistance than copper, requiring larger gauge wires for the same current capacity. Aluminum is often used for cost savings in large installations.

Q3: What if my length exceeds the calculator's range?
A: For very long runs, consider increasing the service size, using parallel conductors, or consulting a licensed electrician.

Q4: Does this account for ambient temperature?
A: This calculator provides general guidance. For high-temperature environments or other special conditions, consult NEC tables or an electrician.

Q5: Can I use this for subpanels?
A: Yes, the same wire sizing principles apply to feeder wires for subpanels carrying 100 amps.