Humidity is fine.
If your humidity is high enough to cause your electricals to corrode and short, your plants will already have rotted anyway, so meh.

However, watering splashes, especially since ferty salts are conductive, are another issue.

You can make your grow safer like this:

-Use a ground-fault interrupted receptacle to plug the whole thin=g into (GFI circuit)
-Mount the power bar from the TOP of your grow so the chance of splashing is less.
-Be careful.

Safety first!

I never saw those outlet things before... ooooooh... I am having IDEAS!!!!