Finding the right wire gauge and amperage is essential when installing, extending, or rewiring a circuit. The wire gauge, or thickness, must match the circuit’s amperage rating to safely handle the ...

I'm a US-trained and US-based electrical engineer. When I want to figure out the the size of a wire I'll need, I reach for my NEC and go to Table 310.16 (most of the time), and it tells me what to use ...

The NEC provides minimum size requirements for conductors to prevent overheating and fire. Insulation type, ambient temperature, and conductor bundling are three primary factors in determining how big ...

Unfortunately, making the proper choices when sizing electrical conductors can get complicated. For one thing, the ampacity tables can be very confusing — especially if you don’t understand the “why” ...