Hi
I am trying to design (with Fritzing) a pcb which uses a flip-flop with a delay off function to switch a 230V supply via a relay. My problem is that I have very little experience designing pcbs and none when it comes to 230V traces, separation etc.

I have tried to attach a jpg of what I have so far but I get an error message saying that "There was a problem uploading your image". So, with the exception of the CO- from transformer to relay trace (which is 2x65mil top and bottom layer) all other mains traces are 104mil alternating between the top and bottom layers to increase separation. I have used 7.62mm screw terminals for the 230V connectors. The board is 88 x 100mm, I can upload the gbr file if needed.
I am wondering if anyone can provide some advice - guidance about the 230V layout, what I need to account for...?

Thanks.

 

If relay is switching the AC, I use minimum trace length from relay contact to board input terminals or any AC entering the board kept as short as possible.
Use as much spacing that the layout/board will allow between AC and L.V.
I think it is because this is your 1st post that uploads not yet permitted.
Max.

 

Thanks for the reply.

I have kept the AC traces as short as I can.
I am thinking about adding a top and bottom copper fill in amongst and around the outside of the AC traces, fuse and terminals, it is a good idea to connect the copper fill layers together (with vias) and to the AC protective earth terminal?

Thanks.

 

It all depends on the circuit as to whether you connect the common to earth GND, if there is Galvanic isolation between the AC and any subsequent low voltage circuit, then it is not necessary unless some otherwise reason exists.
Max.