How many12-2 romex wires can pulled through a 1 inch hole?

You can typically pull about three to four 12/2 Romex wires through a 1-inch hole, depending on the specific installation code, the type of insulation on the wires, and the configuration of the wires. However, it's important to consult the National Electrical Code (NEC) and local regulations to ensure compliance and safety. Always consider the fill capacity of the conduit or hole to avoid overheating and ensure proper installation.