Disclaimer: This blog is for informational purposes. Electrical work is dangerous. Always consult a licensed electrician and adhere to your local building codes (NEC, CEC, or BS 7671).

Picking the wrong cable size isn't just annoying; it is dangerous. Too small, and you risk a house fire. Too large, and you’ve wasted money and wrestled with stiff wire you didn’t need.

When you force high current (Amps) through a high-resistance wire, the wire acts like a toaster element. It gets hot. If the insulation melts and the wires touch? You get a short circuit or an arc fault. If the heat sets fire to your wooden studs? You get a disaster.