It really stands out too much among all other traits in the game and should be brought in line with the rest of the elemental traits. Right now, Voltage 4 can easily kill the Forgotten Viaducts wall even on latest patch. Granted other builds can do that too but it's not close.
Compare it with Burning 4 (Exterminator) or Frost 4 (Beast Huntress)
Exterminator (Fire) Level 4 traits: +30% Burn Damage, +40% Burn Chance
Beast Huntress (Ice) Level 4 traits: +30% Frost Damage, +40% Frost Chance
Sorceress (Lightning) Level 40: Critical Hits Apply Electrify, it's just 1 trait and outperforms the other classes combined 2 elemental traits by a LOT