Because the dielectric breakdown voltage (DBV) in all common PCB materials is generally) k: Y0 I- U, p4 B" Y
1000 V/mil or higher, dielectric failure between power and ground planes is not a6 \# N u9 {5 f5 q* o
concern for typical electronic applications where the voltage requirement is usually. j8 i, m: {4 K: Q+ d( g: }; J
12 V and lower.