OK you changed the game a little when you put a device (other than a splice) in the enclosure.
Now you are in 314.23(F).
Your support, on both sides, now needs to be 18" or less.
(F) Raceway-Supported Enclosures, with Devices, Luminaires,
or Lampholders. An enclosure that contains a
device(s), other than splicing devices, or supports a luminaire(
s), lampholder, or other equipment and is supported by
entering raceways shall not exceed 1650 cm3 (100 in.3) in
size. It shall have threaded entries or have hubs identified for
the purpose. It shall be supported by two or more conduits
threaded wrenchtight into the enclosure or hubs. Each conduit
shall be secured within 450 mm (18 in.) of the enclosure.
I still would be more picky if you were talking about a receptacle. That box better not move when I grabbed it and gave it a twist.
