Tunnel Lighting DB Voltage Drop Calculator

Use this calculator to compute the voltage drop for each Distribution Board (DB) in a tunnel lighting setup with a 3-phase electrical supply.

Understanding Tunnel Lighting DB Voltage Drop Calculations

Voltage drop in tunnel lighting distribution boards (DBs) is a critical consideration in electrical system design. It represents the decrease in voltage between the power source and each distribution point, affecting the performance and efficiency of the lighting system. Proper calculation ensures adequate voltage and system reliability.

Tunnel Lighting System Schematic Diagram

Understanding voltage drop calculations is essential for tunnel lighting system design, ensuring compliance with electrical standards, and maintaining proper light output throughout the tunnel length.

Why Calculate DB Voltage Drop?

System Performance: Ensure adequate voltage levels at each lighting point
Energy Efficiency: Optimize cable sizes to minimize power losses
Safety Compliance: Meet electrical standards for voltage variation
Cost Optimization: Balance cable size with voltage drop requirements

Essential Parameters

Source Voltage: Three-phase supply voltage (390V - 425V)
Distribution Boards: Number of lighting DBs in series (2 - 15)
Power Rating: Three-phase power per DB (max 5000W)
Power Factor: System power factor for accurate calculations
Cable Specifications: Cross-sectional area (25mm² - 120mm²)
Cable Impedance:
- 25mm² - 1.65 mV/A/m
- 35mm² - 1.15 mV/A/m
- 50mm² - 0.87 mV/A/m
- 70mm² - 0.60 mV/A/m
- 95mm² - 0.45 mV/A/m
- 120mm² - 0.37 mV/A/m
Cable Lengths: Distance between consecutive DBs (max 300m)

Voltage Drop Formula

The voltage drop between consecutive DBs is calculated using:

\[VD = \frac{(mV/A/m) \times I \times L}{1000}\]

Where:

\(VD\) = Voltage drop (V)
\(mV/A/m\) = Cable voltage drop constant
\(I\) = Operating current (A)
\(L\) = Cable length (m)

Related Electrical Calculators

Cable Sizing Calculator - Determine appropriate cable sizes for your system Low Voltage Cable Short Circuit Rating Calculator - Evaluate cable protection Voltage Divider Calculator - Analyze voltage distribution in circuits

Conclusion

Accurate voltage drop calculations are important for tunnel lighting system design. Consider factors like cable length, load distribution, and power factor when designing your system. Always verify calculations against local electrical codes and standards.

Regular system monitoring and maintenance help ensure optimal performance and longevity of your tunnel lighting installation.