Junction box question

[wyliesdiesels]

Yes if the wire is exposed it will either need to be in conduit or need to be a jacketed cable like SER.

The answers for 50a subs are most likely defaulting to the 60* c amapcity column which is for NM-b and thus theyre getting #6 cu or #4 al. That is why its better to just size the wire yourself using the ampacity table…

 

[billconner]

Well, finding no. 8 SER seems to be a challenge and if I do, not sure it will cost any less than no. 6. I was going to do a whole new feed - 90 amps - and found no. 3 was more expensive than no. 2 because no. 2 is more common.

So if all copper and 75°, looks like I can go to 60 amps. Better for one EV 50 amp charger plus the lights and openers, all that's on it now.

 

[billconner]

Stupid question, never done this, but 1" pvc in and SER out of a 4x4x4 pvc box. Do I want holes both on bottom or 1 top and 1 bottom? And to rear center or what? 4 stranded copper no. 6s in and out. PVC has to enter bottom. Bigger would have been nice but 60+ ci should be plenty.

 

[mike93lx]

Stupid question, never done this, but 1" pvc in and SER out of a 4x4x4 pvc box. Do I want holes both on bottom or 1 top and 1 bottom? And to rear center or what? 4 stranded copper no. 6s in and out. PVC has to enter bottom. Bigger would have been nice but 60+ ci should be plenty.

Whichever orientation works well in the application. Won't really matter from a connection standpoint since you are using it as a junction box and not a pull box.