well we're forgetting the disco within sight here, aren't we?
best possible scenario, all wires come up to a loto switch on a post by the sewer entrance, there's usually enough SO cord
funny how the manufacturer's instructions always say 'to be installed by a licensed electrican' , yet mention nothing of it, and show pictorals of their own 'sewer proof' boxes without one eh?
the first consession is the nothing visible one, where a greenlee ground box may be used to displace the splicing from the methane (and from the worker being exposed to it, for you osha compliant sorts)
the last thing i'd do is a pvc box in the sewer hole. I tell people it won't last, and it usually doesn't.
last one i did , the lady insisted on not seeing anything in her pristine back yard, so it was the pvc box, the so cord connectors, as well as the small split bolt conn coated with scotchcote, sealed with duc seal, taped with splice tape within it aka= bomb proof
the lady had the access hole covered with 6" of dirt & grass...
it failed within a years time.........
take it from a dude who's crawled in enough sh*tholes
don't make a splice of any sort in them, unless your really really tolerant.....
~S~
