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Circuit Break - A MacroFab Podcast

Circuit Break - A MacroFab Podcast

Technology

MEP EP#288: We have clearance, Clarence

MEP EP#288: We have clearance, Clarence

2021-08-04
Download Right click and do "save link as"
MEP EP#288: We have clearance, Clarence
PCB design rules for clearances
  • Stephen's favorite calculator
  • Clearance and creepage
  • According to the IEC (international electrotechnical commission) a global standards organization
    • Clearance - The shortest path between two conductive parts, or between a conductive part and the bounding surface of the equipment, measured through air
    • Creepage - The shortest path between two conductive parts, or between a conductive part and the bounding surface of the equipment, measured along the surface of the insulation
  • IEC/UL 60950-1 Safety standards - has more in depth information on spacing and how to handle mains
  • IPC2221 generic pcb design rules - Has simple information on spacing vs voltage
  • The creepage requirements depend on
    • insulation material group
      • Comparative Tracking Index (CTI) is used to measure the electrical breakdown (tracking) properties of an insulating material. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to electrical arcing heat carbonizes the material. The carbonized areas are more conductive than the pristine insulator, increasing current flow, resulting in increased heat generation, and eventually the insulation becomes completely conductive.
        • I 600V
        • II 400 to 600V
        • IIIa 175 to 400V
        • IIIb 100 to 175V
    • pollution degree
      • Degree 1 - no pollution
      • Degree 2 - non-conductive contamination that might temporarily become conductive due to condensation
      • Degree 3 applies to conductive pollution, or to dry non-conductive one which could become conductive due to condensation
    • working voltage
    • Altitude and elevation - Multiply by 1.48
    • Appliance insulation class
      • Functional
      • Basic
      • Supplementary
      • Double Insulation - Double the creepage
      • Reinforced - Double the creepage
  • IPC2221 requirements - Actually tend to be larger
    • External
    • Internal
    • Coated
Stephen’s thoughts on the AND!XOR hardware puzzle

view more

More Episodes

MEP EP#184: Like a Satellite Out of Hell
2019-08-07
MEP EP#183: Feel the Hum
2019-07-31
MEP EP#182: The Wireless Research Center
2019-07-24
MEP EP#181: Greg Paulsen: Pizza is the Way to an Engineer's Heart
2019-07-17
MEP EP#180: Chrissy Meyer and Personal Errata Datasheets
2019-07-10
MEP EP#179: Mach 3 Cheeseburgers
2019-07-03
MEP EP#178: Little Shop of Transformer Horror
2019-06-26
MEP EP#177: Leeroy Jenkins Transistor
2019-06-19
MEP EP#176: Some Impedance or Whatever - Nick Chelyapov with Bitty
2019-06-12
MEP EP#175: Are Projects Really Useless?
2019-06-05
MEP EP#174: Apply Inspiration Here
2019-05-29
MEP EP#173: Sidecreeping Gyrations
2019-05-23
MEP EP #172: Triode Mode Tariffs
2019-05-15
MEP EP #171: Mayonnaise Drone (And Other War Crimes)
2019-05-08
MEP EP #170: Start Getting Crusty
2019-05-01
MEP EP #169: Is "I'm an Engineer" a valid defense?
2019-04-24
MEP EP #168: Kevin Beller of Seymour Duncan
2019-04-17
MEP EP #167: BenHeck and the PinoTaur
2019-04-10
MEP EP #166: Ken and Chip Gracey of Parallax Inc
2019-04-03
MEP EP #165: Dillon Nichols - Simplified Home Automation
2019-03-28
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