Electrical – Flexible Nonmetallic Conduit inside wall

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I’m finishing up wiring a sub panel in an outbuilding. There is an underground run of PVC conduit with THWN, which comes up to an LB on the exterior wall. On the inside I used flexible conduit so I could have a tight bend that comes up to the breaker box. Is this code? I can’t find anything in the NEC about this specific instance. I’ve attached a photo for reference.

I’m in the US (Florida). enter image description here

Edit:

The outbuilding is an office/man cave for me. I’m going to finish it with drywall. Currently there are 5 total circuits planned, each 120V: lights, a split A/C (20A max), and some 120V outlets. I don’t plan on ever having any heavy equipment out here, so there aren’t any 220s.

The feeder size is 6/6/6/8 (60A max). I’ll have a 60A double-pole breaker in my main panel and a corresponding double-pole 60A in this panel which will act as a main breaker/disconnnect. I know 60A is massive overkill. It’s a 120foot run and I wanted things to be as efficient as possible in terms of voltage drops.

That still leaves me with 1 open slot that I can’t really think of what to do with. I chose a smaller panel because I didn’t want to stare at a huge panel all day, and I just couldn’t think of any additional needs. Even the outlets could have really been consolidated into 2 circuits instead of 3, but I wanted the isolation for the computers/servers.

I hope I didn’t miscalculate. Am I able to use 2 of the slots in this panel for a double-pole “main breaker”, or do I need a box with a special slot for that?

Edit 2:

Here’s a photo of the bend and panel label. It’s fairly tight, but I don’t think it’s deforming the tube like it mentions in 350.24. I can measure the radius if that helps.

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Best Answer

Liquid Flex May be Okay

NEC 2017 356.1 Liquidtight Flexible Nonmetallic Conduit 

-- Basically says you're good but I cannot tell the size of the flex.
   It looks to be 1in. diameter, which is fine if that is the case.

-- You may need to secure every 3ft or less to be in accordance w/ 
   356.30 for securing runs longer than 6ft if that were to happen.

However, you have other issues to attend to...

Disconnect Means Missing

NEC 2017 Part II 225 Buildings or Other Structures Supplied by a
Feeder(s) or Branch Circuit(s) require a Means to disconnect all 
ungrounded conductors per 225.31

-- Basically anytime you have a separate structure fed by a branch
   circuit or feeder, you need a disconnect means AT THE STRUCTURE 
   to disconnect all ungrounded conductors (and no more than 6). 
   This is often done by installing a main-breaker type panel as 
   opposed to a main-lug which you have used as shown in your 
   pictures.

   The NEC does not define structure and as such a piece of wood 
   driven into the ground with a sub-panel on it could qualify as
   structure to the authorities having jurisdiction.

Back-feeding breaker as a "Disconnecting Means"

Per NEC 2017 408.36 (D) Back-fed breakers used as a Disconnecting Means
MUST be bolted or secured in place as to not be pulled out.

-- Basically this means you cannot just stick in a 60A breaker
   in you current panel and use it as a disconnecting means because 
   it is not bolted in place.  You could use a hold-down kit as 
   mentioned in your comment, but I think you'd do better with a 
   bigger main-breaker panel.

You still need a Disconnecting Means in the outhouse in addition to the rule of 6

Concerning your comment "...Apply 225.33 (A)"    

-- To be clear: Every structure requires at least (1) disconnecting 
   means but no more than 6 to disconnect all ungrounded conductors.

   225.31 has (4) exceptions to the location of the disconnecting
   means, but none are related to the rule of 6.

Bushings

NEC 2017 352.46 Bushings for PVC based Connectors &
NEC 2017 300.4(G) Insulated Fittings

-- If the feeder conductors are 6 AWG or larger you will need a 
   bushing for the PVC connector entering the bottom of the panel 
   box.

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