You haven't enough info for any answer.
In Canada you would have to meet TP 127 for swbds and I assume you mean switchboard by that. I assume it is a small boat and you are in Canada, which is a lot of assumptions.
I have added the link to TC publications, you can look and see what you could use.
God I hate Transport Canada's site with a passion. It is like they don't want you find anything!!
If you plug TP127 in the search box, you will get all kinds of info. Good luck
Or you could start at the home page and look