UL 1998 Standard: software classes

yodon

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Does anyone have experience with UL 1998 (Standard for Safety - Software in Programmable Components)?

I was doing ok until I hit the appendix which kind of falls into a discussion of software classes. Nothing in the body seems to refer to any classes. It's rather unclear (to me) how to apply the clauses in Appendix A3. Some of the statements indicate specific classes and others don't. I presume if they don't then they apply to both classes (but then why didn't they put that in the main body)?
 
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