And please note that the dimension from the voltage calculation is for the space between tracks. The copper cross section is determined by the current that it must carry.
Donald. (Your English is fine; no apology necessary, Carlo.) ----- Original Message ----- From: "Carlo Garberi" <[email protected]> To: [email protected] Sent: Monday, August 10, 2009 3:38:32 AM (GMT-0500) Auto-Detected Subject: R: [kicad-users] Fwd: more than one library importing at a time You can use this "empiric" rule (used in industry, generally, but also suggested into many books): - Voltage Insulation: 10 volt x mil [ex: 200 volt = 20 mils] - Current, track dimension: the same for a air-wire, about 3A/mm or 3A/100mils for "long" tracks [>1 inch] up to 6A/mm or 6A/100mils for a short track; this for a FR4 (or similar) 35 micron Cu (standard, normally used, board). This condition only for a "continuous flux current" (ac or dc), the "worse case". More current for a more thickness of Cu or for a better duty-cycle. Excuse me for my English. Carlo, I2GOQ --- Lun 10/8/09, [email protected] <[email protected]> ha scritto: Da: [email protected] <[email protected]> Oggetto: [kicad-users] Fwd: more than one library importing at a time A: [email protected] Data: Lunedì 10 agosto 2009, 06:44 Dear SIR, Any one can let me know the pcb track size according to the voltage and current rating increases. For example if it is a 5v dc supply is passing through a track then what will be the track size and same also for current. Regards Rupak R Bangalore India.
