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PCB DESIGNING AND MANUFACTURING

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  1. INTRODUCTION
    4 Topics
  2. CONDUCTOR AND CONDUCTIVE PATHS
    3 Topics
  3. ZERO PCB
  4. OVERVIEW OF ELECTRONICS
    4 Topics
  5. CLASSIFICATION OF PCB
    2 Topics
  6. EAGLE OVERVIEW
    2 Topics
  7. COMPOSITION OF PRINTED CIRCUIT BOARD
    3 Topics
  8. BRIEF ABOUT COPPER
  9. COLOR OF THE PRINTED CIRCUIT BOARD
  10. PCB MANUFACTURING
  11. PCB DESIGNING
    2 Topics
  12. PCB DESIGNING SOFTWARE
    3 Topics
  13. SCHEMATIC STUDY
    4 Topics
  14. PCB TERMINOLOGIES
    13 Topics
  15. ROUTING
    5 Topics
  16. GERBER GENERATION
    4 Topics
  17. GROUND PLANE
  18. BILL OF MATERIAL
    1 Topic
  19. MISCELLANEOUS ACTIVITY
    1 Quiz
  20. ROUTING RULES
    6 Topics
  21. ACTIVITY 1
    1 Quiz
  22. ACTIVITY 2
    1 Quiz
  23. ACTIVITY 3
    1 Quiz
  24. ACTIVITY 4
    1 Quiz
  25. SCHEMATIC DESIGN
    13 Topics
  26. LAYOUT DESIGN
    8 Topics
  27. ERC
    8 Topics
  28. DRC
    3 Topics
  29. ACTIVITY 6
    1 Quiz
  30. Activity 7
    1 Quiz
  31. ACTIVITY 8
    1 Quiz
  32. ACTIVITY 9
    1 Quiz
  33. ACTIVITY 5
    1 Quiz
  34. ASSIGNMENT 1
    2 Topics
  35. ASSIGNMENT 2
    1 Topic
  36. MISCLLANEOUS ASSIGNMENT
    1 Topic
In Progress
Lesson 37, Topic 1
In Progress

SPACING

27/07/2021

When I was an undergrad, I did a lot of electrochemical etching. I put it on my resume for years, because interviewers were always interested in hearing about working with high voltage sources and terrifying chemicals. 

That was when I started looking into high voltage design. I was amazed by the standards that are required for high voltage products. I was also relieved. While I can’t prevent grad students from McGyvering our high voltage products, I do have peace of mind knowing that there is board level protection in place.

high voltage pcb design

When does safety require specific spacing rules?

Not every PCB design has the same rigorous rules on spacing that a high-voltage PCB design needs. In general, if the normal operating voltage of your product meets or exceeds 30 VAC or 60 VDC, then you should be very diligent about spacing rules in your high voltage PCB design. If you have a high-density board, especially with high voltages, you need to be even more concerned. PCB trace spacing requirements already help prevent signal integrity problems, but they are also important to prevent arc discharge. The high density makes spacing much trickier, and even more important for protection.

Spacing is more important in high voltage PCB design rules because a potential difference between conductive elements on a board can create an arc if the voltage between the conductors exceeds the breakdown voltage. Any arc that does occur poses a significantly higher risk to both the product and your users. To help mitigate that risk, there are standards for two primary spacing measurements in your PCB design: clearance and creepage distance.

Arcing between two wires.
When the voltage between two points overcomes the breakdown voltage, arcing can occur, damaging your product creating a safety hazard for users. Spacing on your board is a critical design parameter for preventing arcing.