Acceptable to add knockout to PVC conduit body?

Question

I have a 1" PVC LB Conduit Body passing through a wall into the electrical panel (the conduit body ultimately leads to a SPA pack). I'd like to add a 20amp receptacle on the opposite site of wall the panel is in but due to other equipment on the back of that wall, none of the other knockouts on the panel are accessible.
Is it acceptable to drill a 1/2" knockout in the conduit body to mount a weatherproof box right next to it (and feed 12ga THWN into that box for the receptacle)?
It's one of these kind of fittings: https://www.lowes.com/pd/CARLON-1-in-Pull-Connector-Schedule-40-PVC-Compatible-Schedule-80-PVC-Compatible-Conduit-Fitting/1000999146

Ed Beal · Accepted Answer

I believe it would violate code even if it had a stamped volume. The modification would weaken the structure. A stamped conduit body can be used for splices, but conduit bodies are separate from J boxes that are allowed to be modified.
I would probably change over to a “anybody” conduit body. These are configurable straight, left, right, T , and an extra port can provide what you want. I used to carry a couple of these in 1/2, 3/4 & 1”. You don’t have to have all of them if you want to save space.
There are also threaded covers available through Hubble. I think I have picked them up at Home Depot as well, similar to the anybody conduit body.

Harper - Reinstate Monica · Answer

That would not be allowed by NEC 110.3(B) unless the conduit body had labeling or instructions (which are part of its UL listing) telling you that is OK.
Ed Beal has the right idea with an "anybody" conduit body. Those are slick! You will have to pull the wires out to change the conduit body.   You could also replace the body with a junction box.

Acceptable to add knockout to PVC conduit body?

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