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Code defines minimum sizes, based on fill percentage. Larger also meets code (by exceeding it.) Anyone who has ever pulled a conduit at/near maximum fill % (40 for 3 or more wires in conduit longer than 24") can tell you it's not fun to do. You have a short run across the yard, so the conduit expense is not a huge factor. In general, the conduit expense is ...


According to table 1, in chapter 9 of the national electric code, either schedule 40 or 80, 1/2" pvc is sufficient. However in practice I never use anything smaller than 3/4" conduit underground unless I absolutely have to.


I know this is supposed to be an answer to the conduit but have you considered running UF wire(since your digging 18" underground anyway) and do away with the conduit and elbows and glue.


You could do two 20 ampere circuits, or one 20 and one 15 ampere circuit. If you do two 20, you could run a multi-wire branch circuit, which would save you a wire. Since you're using conduit underground, you'll have to use wire rated for wet locations. You'll probably want 12 AWG THWN wires for 20 amperes, or 14 AWG THWN wires for 15 amperes. You'll need ...


You can purchase HDPE online from McMaster-Carr in a wide range of ID sizes (3/4", 7/8", 1", 1 1/4", 1 1/2", 1 3/4" and 2"). The material is Semi-Clear White and is available in lengths of 10, 25, 50 and 100 feet. The tubing is specified for use with compression fittings (also available from McMaster-Carr) and supports a usage temperature range of -100F to ...


PVC is probably the easiest, and cheapest. Just remember to glue your joints, and install expansion fittings where appropriate.


Rigid nonmetallic approved for direct burial (at 18" PVC is the easiest and cheapest way to go)

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