1. What is PCB High Voltage Clearance?

Definition: This calculator determines the minimum required spacing between conductors on a PCB based on the working voltage.

Purpose: It helps PCB designers ensure safe distances between high voltage traces to prevent arcing and maintain reliability.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Spacing — Minimum clearance distance (millimeters)
• V — Working voltage (volts)

Explanation: For voltages up to 500V, the minimum spacing is 2.5mm. Above 500V, an additional 0.0025mm per volt is added.

3. Importance of High Voltage Clearance

Details: Proper clearance prevents electrical breakdown, arcing, and ensures long-term reliability of high voltage circuits.

4. Using the Calculator

Tips: Enter the working voltage in volts. The calculator will determine the minimum recommended spacing between conductors.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula applicable for all PCB materials?
A: This is a general guideline. Specific materials may require different clearances - consult material specifications for critical applications.

Q2: What about creepage distance?
A: Creepage requirements are typically greater than clearance. This calculator only determines clearance (through air) requirements.

Q3: Does altitude affect these calculations?
A: Yes, higher altitudes may require greater clearances due to reduced air density.

Q4: What standards is this based on?
A: This follows common industry practices, though specific standards (IEC, IPC) may have different requirements.

Q5: Should I add a safety margin?
A: Yes, consider adding 20-50% to the calculated value for critical applications or harsh environments.