The answer to 'what size electrical wiring do I need' is that the size of electrical wiring you need depends on the specific electrical load and application in your home. Generally, the larger the electrical load, the larger the wire size required to safely carry the current. Factors to consider include the total amperage draw, length of the circuit, and the type of equipment or appliances being powered.
For most standard household circuits, 14-gauge or 12-gauge copper wire is commonly used. However, for higher-powered circuits like those for electric ovens, clothes dryers, or HVAC systems, you may need 10-gauge or even 8-gauge wire. It's important to consult the National Electrical Code (NEC) or work with a licensed electrician to determine the appropriate wire size for your specific needs.