To any and all safety gurus,
I am in the midst of trying to minimize the creepage and clearance
requirements between TNV and SELV called out in IEC 950. My
interpretation of tables 5 and 6 in sections 2.9.2. and 2.9.3 are that
minimum clearance is 2.0mm and minimum creepage is 2.5mm. This is
based on a global design using up to 250V mains, pollution degree 1 &
2 and Material Group IIIa + IIIb. The application is for Class I as
well as Class II systems.
I could not find a reference explaining the definition of the
Material Groups and would appreciate any insight into a clause, etc.
which I could reference to reduce these spacing requirements. Please
also advise if you are in need of further details.
Thx,
Joe
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Joe Finlayson
Manager, Compliance Engineering
Microcom, Inc.
