Hi.
I'm in the process of designing a PCB which can be seen in the attachment. This will be a four-layer board, with the two inner layers dedicated to power and ground. All of the circuitry runs on 3.3V, so initially, I had a solid plane for that. Now, since I have to also distribute 24V to most of the connectors on the board, and all of the circuitry is located in one place, I decided that it would be better to split the plane into two parts.
The unfilled area in the top-left corner is where the 3.3V plane will be, the rest is the 24V plane. My question is thus: is it a bad idea to have this loop shaped plane? Would it be better if I only let current flow through the top part of the board? The power inlet is located at the top-left corner, you can see three holes in there.
Please let me know what you think. Thanks!