The metal edge is a separate design interfaceCopper-to-edge geometry must account for the process envelope. The result does not establish an insulation or hipot rating.The metal edge is a separate design interfaceIllustrative cross-section and geometric allowanceEdge allowanceCircuit copperAluminum baseNominal gap − routing − burr envelope − registration = screened gap³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale