First start on Table 5 ch9

find THHN row and use Approximate area square inches.

then add the total of all of the conductors of your example.

Then go to raceway properties Table 4 of ch9

Find rigid PVC conduit

scroll down the 40% column until you find a number that is higher than the total area that you calculated.

then look to the left of that row you will see what conduit is needed.

Added: Based on my calculation you need a 1.25" conduit

**Edward**

*The only thing I know, is the progressive discovery of my ignorance*

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