1. What is Cable Size Calculation?

The cable size calculation determines the appropriate cross-sectional area of electrical cable needed to safely carry a given electrical load. Proper sizing ensures efficient power transmission and prevents overheating.

2. How Does the Calculator Work?

The calculator uses the standard cable size formula:

Where:

• \( Power \) — Electrical power in Watts
• \( Voltage \) — System voltage in Volts
• \( Power Factor \) — Ratio of real power to apparent power (0-1)
• \( Efficiency \) — System efficiency (0-1)

Explanation: The formula calculates the minimum cable size required based on the electrical load characteristics.

3. Importance of Proper Cable Sizing

Details: Correct cable sizing is crucial for electrical safety, preventing voltage drops, minimizing power losses, and ensuring compliance with electrical codes.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, power factor (typically 0.8-0.95), and system efficiency (typically 0.85-0.95). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is power factor important in cable sizing?
A: Power factor affects the actual current carrying requirement of the cable. Lower power factors require larger cables for the same real power.

Q2: What are standard cable sizes available?
A: Common sizes include 1.5mm², 2.5mm², 4mm², 6mm², 10mm², 16mm², 25mm², etc. Always round up to the nearest available size.

Q3: Does this calculation account for voltage drop?
A: This is a basic calculation. For long cable runs, voltage drop calculations should also be performed.

Q4: What safety factors should be considered?
A: Always consider ambient temperature, cable grouping, and installation method which may require derating factors.

Q5: Is this suitable for DC systems?
A: Yes, for DC systems use power factor = 1 and appropriate voltage.