Electrical – Back-to-back conduit bodies for wall transition

electricalnec

I am running an 80A (4AWG Copper) line for EV charging in my garage. I am using EMT conduit and I need to transition through drywall. Since the studs are not deep enough (2×4) for the minimum radius turn to fit, can I put an LB conduit body on both sides of the wall to effect the transition? It seems to be code according to NEC, but it's exploiting an exception back-to-back, namely:

NEC 314.28(A)(1): for 4 AWG or larger conductors the distance from a conductor's entry to a "box" and the opposite wall must be at least 6 times the raceway size – 1" EMT in this case, so 6" – except if the opposite wall is a removable cover. So I'd be exploiting this exception twice with essentially zero intermediate cable run.

ASCII picture: 

       GARAGE
                   ---------- <--- removable cover for LB conduit body #2
                ________________
  LB conduit    | .................... 4AWG conductors
  body #2 ----->| . ____________
================| . |========================== <--- drywall
       _________| . |
4AWG .............. | <-- LB conduit body #1            
       _____________|         
         ----------  <--- removable cover for LB conduit body #1

Best Answer

There is no restriction to how many you use. We regularly use extra pull boxes and conduit bodies to make the job easier. It’s not cheating at all. Each one is listed for that use once it leaves the conduit body. There is nothing except cost preventing you from using them.

Related Topic