Because the dielectric breakdown voltage (DBV) in all common PCB materials is generally9 M* T0 A: r8 v' [- B9 E- U
1000 V/mil or higher, dielectric failure between power and ground planes is not a: r9 b v* \* w2 _/ I
concern for typical electronic applications where the voltage requirement is usually5 M# f" A* |! Q
12 V and lower.