Rv sub panel wiring

[ampme]

Is it legal to wire a panel this way? And if so should you use 10 gauge for 30 amp and 12 gauge wire for 20 amp tap wires?

 

[ActionDave]

Without a completed profile that shows how you are employed in the electrical industry there is no way to know if your question violates the forum rules against giving electrical advice to someone who is not an electrician.