Underground Panel for Overhead Temp Service - Wire Type?

[JRTG]

I am in the process of starting a small cabin build on my property. A builder friend gave me a 100 amp underground temp combo box to use. The local utility, as well as the inspector, does not see an issue with treating it like overhead service except it does a 180° sweep and comes into the bottom of the underground box as if it were underground power. A 50 amp RV receptacle will be added to the box to make a total of (2) 20 amp 120v GFCI circuits and a 50 amp 240v RV circuit. Question is... What type of 2 AWG aluminum wire do I use?

 

[Dennis Alwon]

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