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What you said is possible, you just need to keep the trace at least 5mm away from anything else.
But the bigger problem is that 30A is very large current and you will need some pretty wide traces, for 35um copper and 40K temp.
I have some questions for you:
1.Is one layer a ground plane? If so, does it cover most of the board area?
2.Is the 5V DC isolated from the AC?
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