went through my files Phil;

EN 60601-1:1990 ; issue 2,Oct. 1997, table XVI(p106) :

air clearance 5mm, creepage 8mm , for 250V
              3.2           6         125V
              7            12         400V (380)

that is for double insulation (reinforced) , as the 3.2 Roberto listed from
UL
is double ins. reference , even if air clearance (6 creepage)

2.5mm creepage for 230 did sound too low


Basic insulation (supplementary)as comparing to double is 2.5mm air for 250,
but 4mm creepage (6mm for 400).

Let me know if we confused ourselves .


paul


-----Original Message-----
From: Phil Dutton [mailto:[log in to unmask]]
Sent: Friday, 9 June 2000 14:08
To: [log in to unmask]
Subject: Re: [TN] info about creepage distance


Hello Roberto,

I have recently had a similar problem.
We used our Australian standard AS3260. I don't know what the equivalent
European standard would be.
I needed to know what the Comparative Tracking Index (CTI) of FR4 from our
manufacturer was - (100 to 175)
CTI according to IEC 60112.
This put it in material group IIIb.
With pollution level 2, that gives a MINIMUM creepage distance of;

2.5mm for the 230V case
4.0mm for the 380V case

I hope this is of some help.
(Always better to try for as much clearance as you can spare with this sort
of application though.)
Any other opinions out there?...(these are my own experiences only - not my
company's - no

regards,

Phil.

At 17:17 7/06/00 +0200, you wrote:
>hi to all
>i want to know the minimun distance between two trace on a standard fr4
>material
>with a pollution level of 2 (from vde0110).
>
>the voltage is 230vac for the trace under the mains and 380vac for the
>power section
>in europe we look a table from CEI EN 60335-1 that say to use 1 mm every
>100v for
>level 2 of pollution and 1 mm every 150v for 2 level
>
>is there similar for UL standard ?
>
>we make coffee machine and i look on the UL197 standard (table 28.1) that
>say a minimun
>distance of 4mm or 3.2mm for 126 to 250vac (in the U.S. we sell only
>single phase machine).
>
>
>thank's a lot
>roberto radaelli
>rancilio coffee machine
>e-mail <mailto:[log in to unmask]>[log in to unmask]
>
>
>
>
>
>


Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer

Vision Abell Pty Ltd
Second Avenue, Technology Park,
Mawson Lakes.  SOUTH AUSTRALIA  5095
================================
Phone : (08) 8300 4400 (reception)
Fax :           (08) 8349 7420
email:          [log in to unmask]
Internet Page:  http://www.vsl.com.au
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