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[SOLVED] Creepage, clearance, and insulation types

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lw1ecp

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Hi! I already know the definitions for creepage, clearance, type I and type II products.
My doubt is: are creepage and clearance requirements applicable just to class II products?
Can you relax creepage and clearance strictness thanks to the earth cable in class I?
Thank you!
 

lw1ecp

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Just to close the subject, I am posting what I've found. Creepage applies to both type I (with earth cable) and type II (without). The difference is: for type I, minimum creepage is 4mm for the most common situations, and 4+4mm (double insulation) or 8mm (reinforced insulation) for type II. That's all!
 

FvM

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Class II devices are throughout protected by double or reinforced insulation and don't involve a protective earth connection.

Class I devices may expose circuits that are not connected to protective earth and thus need double or reinforced insulation. Examples are e.g. given in IEC 1010, Annex D.
 
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    lw1ecp

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lw1ecp

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FvM, you're right! My main interest was how to connect the "class" with the creepage value but I've just found that in ECMA-287. Thank you!
 

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