i'm investigating about UL certification and Class I div 2 requirements to design PCB but i have no idea about it. I was looking for some documentation, or what to do guide but i have not good lucky with this. i don't know if i am looking on the wrong way, so i would like you to help me with this.
i still continue looking for it because nobody gave me a specific answer about this. The only thing that until the moment i have clear is that the PCB must be certificate with the UL796 standard and if you want to assure that the equipment can work in Class I Div II hazardous environments, the entity which can certificate that is the CSA International (Canadian Standards Association). But i do not know which could be the Standard to this topic.
So how does a company design their board. Do they buy this standard and design accordingly or could you explain the procedure that a company follows
while designing a board.
Yes you buy the standard, that's the first port of call. Then you read it and follow all guidelines in the standard that are pertinent to the layout, usually current capacity of traces with UL.
Then if it has to be certified you send the completed assembly to UL and they measure it etc.
They are strict and its expensive to get items certified.