Your extension cord must be as thick as the wall wire feeding the outlet. If your tool draws 15 amps, you need a 14 AWG cord (or thicker).
There are four primary pillars that dictate the minimum allowable cross-sectional area of a cable. The final selected size must satisfy all four conditions simultaneously.
A cable must survive a fault condition until the protective device (circuit breaker or fuse) operates. cable size
There are four primary reasons why precise cable sizing is critical during the design stage:
Here is the "household" standard for NM-B cable: Your extension cord must be as thick as
In the era of energy efficiency, the "minimum size" approach is becoming obsolete. Engineers are increasingly selecting cables based on Life Cycle Cost Analysis, favoring larger conductors to reduce $I^2R$ losses over the asset's lifespan. Furthermore, the rise of Power Electronics necessitates a re-evaluation of standard sizing tables to account for harmonic heating and skin effects.
The environment dictates the cable's performance as much as the copper inside it. The final selected size must satisfy all four
Alex nodded. "Makes sense. I've seen those machines drawing a lot of power. What size are you thinking?"
Not all insulation is created equal.