Anyway, let's look at the physics. Lighting is an ultrashort, high voltage pulse. There are 3 main dangers :
1) The Arc Flash => Air heated by lightning is extremely hot, possibly well in excess of 20 000 degrees. This is however an extremely localized effect, occuring only within a few centimeters of the impact and exit point
2) Resistive heating => Basically, electric resistance turns electricity into heat. Not that great if the object resisting is your flesh.
3) Neural interference => Your body uses electricity for many things, including telling your heart what to do. Shocking it is not advised.
Now, the armored suit protects against 3 with certainity. Lightning follows the path of least resistance, and thus will never enter the flesh of the occupant. Against 2, it's also a great defense, because metal has greater conductivity and thus doesn't heat as much. Given the very short burst of lightning, the metal will not overheat.
Number 1 does this :
http://lightningsafety.com/nlsi_pls/car_strike_pix/pic1b.jpgDepending on how thick the armor is, this should inflict only light damage upon it. I mean, the helmet will be damaged, no doubt, but the occupant will not be harmed as the explosion takes place on the outside.
So, it's not a bullet and a wooden helmet, it's a poison dart. Lethal if it penetrates, harmless if it doesn't.
Feel free to employ one (1) piece of pokemon logic against us.
Electric does not get a bonus against steel type pokemon.
That said, will you please tell your ships to simply burn. It suprises me that none of our fireball spells have had any noticeable effect on the naval theather. Just doesn't make any sense.