1. What is a Single Phase Voltage Drop Calculator?

Definition: This calculator estimates the voltage drop in a single-phase electrical circuit based on current, conductor length, and resistance.

Purpose: It helps electricians and engineers ensure proper voltage levels in electrical installations by predicting voltage loss in conductors.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current flow (amperes)
• \( L \) — One-way length of conductor (meters)
• \( R \) — Resistance per unit length (ohms/meter)

Explanation: The factor of 2 accounts for the return path in single-phase circuits (both "hot" and neutral conductors).

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical devices receive adequate voltage for proper operation and prevents excessive power loss.

4. Using the Calculator

Tips: Enter the circuit current in amps, conductor length in meters, and resistance per meter in ohms. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's an acceptable voltage drop?
A: Typically 3% for branch circuits and 5% for feeders, but check local electrical codes.

Q2: How do I find conductor resistance?
A: Check manufacturer specifications or use standard values (e.g., 0.004 ohm/m for 10 AWG copper).

Q3: Why single-phase vs three-phase calculation?
A: Single-phase uses factor of 2, while three-phase uses √3 (1.732) in the calculation.

Q4: Does this account for power factor?
A: This simple version assumes unity power factor. For reactive loads, a more complex formula is needed.

Q5: How does temperature affect results?
A: Higher temperatures increase conductor resistance. For precise calculations, use resistance values at operating temperature.