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You can fit approximately 9 number 12 THHN wires into a half inch conduit. It's important to follow the National Electrical Code rules for conduit fill to ensure proper installation and safety.
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Approximately 9-10 18AWG wires can fit in a 2 inch conduit, depending on the type of insulation on the wires and the specific requirements of the installation. It's always advisable to consult the National Electrical Code (NEC) or local regulations for specific guidelines on conduit fill capacity.
Need to know the wire # size to compute wire fill in conduits
9-10, but the conduit may not exceed a certain length, or a certain voltage in order for you to "legally" do it. Many applications allow for conduit fill ratio's that exceed the standards of the NEC ( National Electrical Code) and most of them are short (less than 24") "chases" between control devices mounted in listed Junction boxes for that purpose. It is not advisable to fill a conduit more than the NEC allows for purposes of heat dissipation.