I know I need a deck box to pass an inspection... but whats its purpose and how is it wired differently than a regular connection box like in an attic?? heres what I understand.... tell me if i'm wrong.... but from the underwater light the wire (back, white, ground) runs in a conduit up to the deck box, then the wires are twisted/spliced together then goes back in the ground in another conduit and goes to the GFCI then to the light switch in the house... (unless i change the breaker to a GFCI).... so whats the purpose of this box if my wire from the light is long enough to make it to the house? And where do I find a PVC one? don't really want to add anymore metal than I already have.... every pool supply store around here has no idea what a deck box is.... so they wouldn't have them.....