1. What is the Voltage Drop Equation?

The Voltage Drop equation calculates the percentage of voltage lost in parallel feeders. It's essential for ensuring proper voltage levels in electrical distribution systems, especially when selling parallel feeder systems.

2. How Does the Calculator Work?

The calculator uses the Voltage Drop equation:

Where:

• \( VD \) — Voltage drop (%)
• \( I \) — Current (amperes)
• \( n \) — Number of parallel feeders
• \( L \) — Length of feeders (feet)
• \( R \) — Resistance per foot (ohms/ft)
• \( V \) — System voltage (volts)

Explanation: The equation accounts for the relationship between current, resistance, and voltage in parallel feeder systems.

3. Importance of Voltage Drop Calculation

Details: Accurate voltage drop calculation is crucial for designing efficient electrical systems, preventing excessive power loss, and ensuring equipment operates within proper voltage ranges.

4. Using the Calculator

Tips: Enter current in amperes, number of feeders, length in feet, resistance in ohms per foot, and system voltage in volts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is an acceptable voltage drop percentage?
A: Typically 3% for branch circuits and 5% for feeder circuits, but specific requirements may vary by application.

Q2: How does parallel feeders affect voltage drop?
A: Adding parallel feeders reduces voltage drop by effectively lowering the overall resistance in the circuit.

Q3: What factors affect resistance in feeders?
A: Conductor material, size, temperature, and installation method all affect resistance.

Q4: When is this calculation most important?
A: Particularly critical for long feeder runs or high-current applications where voltage drop could be significant.

Q5: How accurate is this calculation?
A: Provides a good estimate but actual voltage drop may vary based on temperature, skin effect, and other real-world factors.