1. What is CCTV Voltage Drop Calculator?

Definition: This calculator estimates the voltage drop in CCTV power cables based on conductor properties and current load.

Purpose: It helps CCTV installers and electricians ensure proper voltage reaches cameras by accounting for cable resistance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( \rho \) — Resistivity of conductor material (Ω·m)
• \( L \) — Cable length (meters, round trip)
• \( I \) — Current load (amps)
• \( A \) — Cross-sectional area of conductor (m²)

Explanation: The formula calculates voltage loss due to cable resistance over distance, multiplied by 2 to account for both supply and return paths.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop estimation ensures cameras receive sufficient voltage for reliable operation and prevents image quality issues.

4. Using the Calculator

Tips: Enter conductor resistivity (default 1.68×10⁻⁸ Ω·m for copper), cable length, current draw, and conductor cross-sectional area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is resistivity important?
A: Different materials (copper, aluminum) have different resistance properties affecting voltage drop.

Q2: What's a typical acceptable voltage drop?
A: Generally less than 3% of supply voltage for CCTV systems to ensure proper camera operation.

Q3: How do I find conductor area?
A: Check cable specifications or use A = π × r² for round conductors (convert from AWG if needed).

Q4: Why multiply by 2 in the formula?
A: It accounts for both the positive and negative/ground conductors in the circuit.

Q5: How can I reduce voltage drop?
A: Use thicker cables (larger A), shorter runs, higher voltage, or lower current cameras.