Here is why you need one, how it works, and why "eyeballing it" is never worth the risk. Electricity flowing through a wire generates heat. Every wire has a resistance. The smaller the wire (thinner copper), the higher the resistance.
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). electric cable size calculator
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. Here is why you need one, how it