Ciao Roberto n‘ Jerry

In this case IPC-2221 refers only to a operational clearance without any
respect of consideration about galvanic insulation and safety aspects. 

Bernhard

        -----Ursprüngliche Nachricht-----
        Von:    Jerry Mosur [SMTP:[log in to unmask]]
        Gesendet am:    Mittwoch, 7. Juni 2000 16:35
        Betreff:        Re: info about creepage distance

        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
                e-mail [log in to unmask]
<mailto:[log in to unmask]> 
                 
                 
                 
                 
                 
                 
        	

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