The Basics of Conductor Sizing — Part 1

The Basics of Conductor Sizing — Part 1

How do you select a conductor that won’t melt?

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” behind them and the correction factors you will most likely apply when using them.

A key factor is impedance, which is the opposition to current flow. In DC circuits, we call it “resistance.” Whenever current (I) flows through a conductor, the opposition (R) to current flow produc

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