220-volt junction box

   / 220-volt junction box #21  
Yes you are right SCH 40 will work just as well. I have a tendency to over build. In my own situation I always use SCH 80 underground and go 1 size over what is required. 1 size over sure makes that 4/0 pull easier.
 
   / 220-volt junction box #22  
Hmm, we're all worried about splicing, that should not be a big deal when burying cable. Your deal is what to do with electrical boxes & outlets that are ABOVE ground/sea level. You need a BELL housing. What I'm refering to is an encasement with an open bottom, big enough for whatever box or cabinet you need to protect, and enough room to reach up and plug in connections to outlets, check breakers, etc.. The top can be fastened down with a couple of bolts, just make sure that the top is leakproof, otherwise air will escape as the 'bell' is being submerged and still flood the compartment. This can be a heavy plastic bin or metal container, nothing fancy. I'd just watch putting my hand up into it each time, wasps or something may build a nest up in it.
 

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