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Pool Pump Electric

I just installed an above ground pool (24' x 52") and am now prepping for the power install. I'm in New York and I need to follow many electrical codes, mainly the 2015 International Residential Code.

I will be installing a 20A twist lock outlet and receptacle outlet for the pool pump, plus a 15A convenience outlet for lighting. Both will be mounted on a post 7 and use separate circuit wiring with GFCI breakers in the main panel. I will run NM wire inside the basement and switch to THWN for the outside run. The outside run will be in PVC conduit.

Question 1: To stay in compliance with code, can I run both the 20A and 15A THWN wires in the same PVC conduit, or do I need to have two separate conduit lines?

Question 2: If they can be in the same PVC conduit, can I have all wiring for both power runs feed into the 20A twist lock receptacle box, then feed the lines out and over to the 15A convenience receptacle box, or do I need to separate the lines before the receptacle boxes with a PVC Tee fitting on the post?

Question 3: Since both lines with have GFCI breakers in the main box, I have read that I can bury the PVC conduit to a depth of 12" instead of 18" below grade for non-GFCI protected PVC conduit?

Thank you in advance for any replies!

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