PCB Clearance and Creepage Distances Part 2 Which Criteria Apply

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When designing a PCB for a low-voltage circuit that connects to the mains, how much clearance must be used between the mains or primary side and the low-voltage or secondary side? A typical example would be a mains-switching relay controlled by a microcontroller. • Clearance and creepage distances are determined by a number of parameters. But which ones? And what do they mean? • This is Part 2 of a series of three videos on determining clearance and creepage distances for PCB design: • 1. Which Standard? ( • PCB Clearance and Creepage Distances,... ) • 2. Which Criteria? (this video, • PCB Clearance and Creepage Distances,... ) • 3. Putting it All Together ( • PCB Clearance and Creepage Distances,... ) • Contents • -------- • 0:00 Intro • 0:45 Disclaimer • 1:06 Clearance Creepage • 2:02 Working voltage • 2:18 Insulation • 3:34 Overvoltage • 4:46 Pollution degree • 5:21 Material group or CTI • 6:07 Altitude • 6:44 Summarizing... • 7:15 To be continued... • Resources • --------- • IEC 62368-1 draft 4b: https://ulstandards.ul.com/wp-content... • Check out our YouTube offers: https://www.elektor.com/youtube • Subscribe to our Newsletter: https://www.elektormagazine.com/pages...

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