Hi!!
I would like to ask some questions about electrical clearance. Looking at Table 6-1 ELECTRICAL CONDUCTOR SPACING in IPC-2221A standard you can see:

I am really confussed. I can´t understand the difference between the different categories (B1, B2, B3, B4, A5, A6, A7). For example, why is different an uncoated pad to an uncoated lead/termination? If you can explain a little bit the difference between classes I would be very grateful.
Thank you in advance!
I would like to ask some questions about electrical clearance. Looking at Table 6-1 ELECTRICAL CONDUCTOR SPACING in IPC-2221A standard you can see:
I am really confussed. I can´t understand the difference between the different categories (B1, B2, B3, B4, A5, A6, A7). For example, why is different an uncoated pad to an uncoated lead/termination? If you can explain a little bit the difference between classes I would be very grateful.
Thank you in advance!
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