It looks like your question is a bit unclear. Are you asking:
- How many #10 THHN wires can fit in a 3-inch conduit?
- How many #10 THHN wires are needed for something involving "3" (like 3 circuits, 3 wires, etc.)?
Could you please clarify your question? For example, if you want to know the number of #10 THHN conductors that can be safely installed in a 3-inch conduit, I can provide that information based on NEC (National Electrical Code) conduit fill tables.
