Here's a good list of resources for calculating clearances. I usually go by IPC-2221 Table 6.1. I find that all of these are rather conservative compared to w

Here's a good list of resources for calculating clearances. I usually go by IPC-2221 Table 6.1. I find that all of these are rather conservative compared to what I get from hi-pot testing, but YMMV. https://www.smps.us/pcbtracespacing.html https://www.smps.us/pcbtracespacing.html