Roberto,

IPC-2221, Generic Standard on Printed Board Design, Table 6-1, Electrical
Conductor Spacing, says:

171-250VAC (301-500VAC)    - 1.25mm (2.5mm)        - uncoated, sea level to
3050 m
                                           - 6.4mm (12.5mm)        -
uncoated, over 3050 m
                                           - 0.4mm (0.8mm)          -
permanent polymer coating, any elevation

All figures are for externally run traces.

Jerry

-----Original Message-----
From: Radaelli Roberto [mailto:[log in to unmask]]
Sent: Wednesday, June 07, 2000 11:17 AM
To: [log in to unmask]
Subject: [TN] info about creepage distance


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
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