Clamps or not, energizing 200 amp panel.

[Weekend Warrior]

I am running 2/0 copper triple rated RHH or THW-2 or USE-2 from Menards, 20' underground through 2 1/2" sch 80 PVC. I'm coming up with an expansion coupler and into an LB body on the side of my garage, then going horizontally approximately 8" through a double sheathed and insulated wall with the sch 80 PVC. Then, directly into an interior surface mounted 200 amp breaker box with the sch 80 and a threaded male adapter with steel lock nut and PVC bushing. The conduit will enter the surface mounted box from the back but near the bottom. Note: I'm turning my box orientation 180 degrees for bottom feed and the main breaker and lugs will now be close to the bottom of the box. My question is: Do I need any type of clamp(s) for the three insulated conductors as soon as they enter the enclosure and before they get inserted and affixed into the buss lugs?
Thank you for your advice!

 

[roger]

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