1. What is Resistance of Neutral Wire?

The Resistance of Neutral Wire is the resistance offered by the neutral wire to the flow of current in a 2-Phase 3-Wire US electrical system. It is calculated as the underground AC resistance divided by the square root of 2.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R_{neutral} \) — Resistance of Neutral Wire (Ohm)
• \( R \) — Resistance Underground AC (Ohm)

Explanation: The formula accounts for the relationship between the underground AC resistance and the neutral wire resistance in a 2-phase 3-wire system.

3. Importance of Neutral Wire Resistance Calculation

Details: Accurate calculation of neutral wire resistance is crucial for proper system design, voltage drop calculations, and ensuring safe and efficient operation of electrical systems.

4. Using the Calculator

Tips: Enter the underground AC resistance value in Ohms. The value must be valid (resistance > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is the neutral wire resistance calculated differently?
A: In a 2-phase 3-wire system, the neutral wire carries return current from both phases, requiring a specific calculation to account for this distribution.

Q2: What are typical resistance values for neutral wires?
A: Resistance values vary based on wire material, gauge, and length. Copper wires typically have lower resistance than aluminum wires of the same size.

Q3: How does neutral wire resistance affect system performance?
A: Higher neutral wire resistance can lead to increased voltage drops, power losses, and potential overheating issues in the system.

Q4: Are there safety considerations for neutral wire resistance?
A: Yes, proper neutral wire sizing and resistance calculation are essential for preventing overheating, voltage imbalances, and ensuring electrical safety.

Q5: Can this calculator be used for other wire configurations?
A: This specific formula is designed for 2-phase 3-wire US systems. Other configurations may require different calculations.