According to the One Piece wikia's Enel page, Enel's power won't work against Luffy because he is a rubber-man. But at some point, I'm confused from this fact since lighting that strikes at 1 Million Volts would burn anything, even rubber. Also, he melted gold and placed on Luffy's hand.

So my question is, is there any logical reason why is it that Luffy doesn't feel any hurt when Enel strikes him?? I will not include what episodes this happen.