Re: [PEDA] Voltage Isolation Calculator
Try this: http://www.creepage.com/ tr :) -Original Message- From: Terry Creer [mailto:[EMAIL PROTECTED] Sent: Tuesday, April 20, 2004 10:16 PM To: 'Protel EDA Forum' Subject: [PEDA] Voltage Isolation Calculator Hi All, Does anyone have a 'bare bones' voltage isolation calculator? I mean bare bones, because I know there's a lot of parameters to take into account like height above sea level, board finishes, etc...etc... I heard from somewhere it's about 0.0025 Volts per millimeter, but I'm not sure under what conditions. Surely there's an Excel program or a stand-alone calculator available (preferably free :)) Thanks, Terry * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Voltage Isolation Calculator
In a message dated 2004-04-21 08:36:32 AM Eastern Daylight Time, [EMAIL PROTECTED] writes: I heard from somewhere it's about 0.0025 Volts per millimeter, but I'm not sure under what conditions. Are you sure that wasn't per METER? If your units are right, I've got a whole lot of designs that violate it! (5V requires 2 meters spacing with that number and units) I recall from a NASA spec years ago using 30V max for 10 mil clearance, and that upon further checking, 3V per mil was a good rule of thumb though not exactly correct. That's for bare conductors (i.e. exposed through soldermask openings) in a normal sea level atmosphere. Containment by a dielectric (even soldermask helps some) increases the allowable voltage for any given gap; increase in altitude / decrease in air pressure decreases the allowable voltage for a given gap. Steve Hendrix * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
[PEDA] Voltage Isolation Calculator
Hi All, Does anyone have a 'bare bones' voltage isolation calculator? I mean bare bones, because I know there's a lot of parameters to take into account like height above sea level, board finishes, etc...etc... I heard from somewhere it's about 0.0025 Volts per millimeter, but I'm not sure under what conditions. Surely there's an Excel program or a stand-alone calculator available (preferably free :)) Thanks, Terry * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
