Because the dielectric breakdown voltage (DBV) in all common PCB materials is generally% K% ]/ W! U" `5 ]3 l2 Q% K! K
1000 V/mil or higher, dielectric failure between power and ground planes is not a $ }" b* z. M- P2 Tconcern for typical electronic applications where the voltage requirement is usually # e8 b& Z# R- \6 H( ^12 V and lower.