[225.6] 10 AWG copper or 8 AWG aluminum, if 600V or less for spans up to 50 ft (longer spans are allowed if supported by messenger wire). For over 600V, it's 6 AWG copper or 4 AWG aluminum.
 

[225.14(C). 4 inches.
 

[225.30]. One. But, there are exceptions for 6 special conditions and for some other situations as noted in A, B, C, D, and E..
 

[225.33]. No, the rules are the same because the underlying physics are the same. You have a maximum of 6 disconnects allowed.
 

[225.40]. You must install branch circuit overcurrent devices on the load side, in a readily accessible location. These must be of lower ampere rating than the feeder overcurrent device.