1. What is an Eecol Voltage Drop Calculator?

Definition: This calculator estimates the voltage drop in an electrical circuit based on current, cable length, and conductor resistance.

Purpose: It helps electricians and engineers ensure proper voltage levels throughout electrical installations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current (amps)
• \( L \) — Length of conductor (meters)
• \( R \) — Resistance of conductor (ohms/km)

Explanation: The formula accounts for both the outgoing and return paths (hence the 2× factor) in a single-phase circuit.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical equipment receives adequate voltage to operate efficiently and prevents excessive power loss.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the length multiplied by 2?
A: The factor of 2 accounts for both the outgoing and return conductors in a single-phase circuit.

Q2: What's a typical acceptable voltage drop?
A: Most electrical codes recommend limiting voltage drop to 3% for branch circuits and 5% for feeder circuits.

Q3: Where can I find conductor resistance values?
A: Resistance values are typically provided in cable manufacturer specifications or electrical code tables.

Q4: Does this work for three-phase systems?
A: No, this calculator is for single-phase systems. Three-phase calculations use a different formula (√3 instead of 2).

Q5: Why divide by 1000?
A: The division converts the resistance from ohms per kilometer to ohms per meter to match the length unit.