Remember that some of that distance, I believe, accounts for when the
boards get dirty, and the pollutants build up and reduce the spacings. When you
test the boards during the evaluation they are almost always clean with no
pollution build-up.
Gary
-----Original Message-----
From: MCA Compliance [mailto:bally...@iolfree.ie]
Sent: Friday, March 15, 2002 4:39 AM
To: Emc-Pstc Post
Subject: RE: creepage v breakdown voltage
Peter
I agreee with your comment, but, I have seen lots of boards (material group
III) pass high pot tests at 1.5kV with only 2 mm creepage on the boards.
yet, 950 specifies 2.5mm for basic insulation.
This is why I am after some independent experimental test data correlating
creepage and dielectric strength, with different board material properties
taken into account.
I suppose to flip it around, if a board passes the hi-pot for 1 minute with
2 mm creepage (and the fact that it passes the hi-pot, means the clearance
must also have been adequate?), why does 60950 look for 2.5mm creepage ???
rgds
Brian
-----Original Message-----
From: Peter Merguerian [mailto:pmerguer...@itl.co.il]
Sent: 15 March 2002 12:00
To: 'MCA Compliance'; Emc-Pstc Post
Subject: RE: creepage v breakdown voltage
Brian,
Your PCB manufacturer should be able to tell you what spacings to keep in
order to withstand the test voltages. It all depends on the base material
used for the PCB which all have different dielectric strength properties.
Remember, the standards reference a minimum creepage distance AND you must
still pass the electric strength tests.
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-----Original Message-----
From: MCA Compliance [mailto:bally...@iolfree.ie]
Sent: Friday, March 15, 2002 11:54 AM
To: Emc-Pstc Post
Subject: creepage v breakdown voltage
does data exist which correlates creepage distance on a pcb with
hi-potential test voltage it should withstand ?
for example, I know 60950 sugests a test voltage of 1500Vrms for 1 minute
and a creepage of 2.5mm (material group III) for basic insulation.
How did they arrive at 2.5 mm ???
Brian
email: i...@mcac.ie
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