Change the HV BOARD minimum clearance DESIGN RULE from 0.0889mm to
0.15mm (6 mil). Keep the separate 3.0mm rule on the 415V nets unchanged.
Do NOT route or modify copper yet - just change the rule.
Then report:
How many DIFFERENT-net copper pairs now violate the 0.15mm rule?
List each one: the two nets, the layer, and the exact gap in mm.
I’ll change only the global minimum copper clearance to 0.15 mm, preserve the separate 3.0 mm HV rules, then run DRC and list any new different-net violations.