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Can I run 12-2 NM-B wire from my 20 amp dedicated breaker under my house and then using a four by four box splice 12-2 UF wire to run underground to my water pump house?

Running the wire would be in a dry crawl space, and the 4 x 4 box that the splice will be will also be in the dry crawl space mounted to a floor beam.

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  • When you say "under my house". Do you mean in a dry basement/crawlspace, or under a slab/damp crawlspace? – Tester101 Feb 17 '16 at 13:31
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    When you say 'under my house', do you mean like running through a crawlspace? And would the junction box be under the house too, mounted to the wall outside, or buried? – TFK Feb 17 '16 at 13:36
  • Running the wire would be in a dry crawl space and the 4 x 4 box that the splice will be will also be in the dry crawl space mounted to a floor beam. I'm not sure I placed this in the right place or if I should have edited the post. – jdhar Feb 17 '16 at 17:19
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You can splice the NM above ground in a box above ground then run the UF to your pump. The depth for UF cable to be buried as you exit the foundation is 24” per NEC table 300.5.

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    You can splice the NM in a box above ground, in a dry location. – Tester101 Feb 17 '16 at 15:12

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