Extension cords are measured by their wire gauge size just like the wires running inside your walls. Their ampacity rating uses the same American Wire Gauge (AWG) standards: the smaller the number, the thicker the wire (which means it can carry a larger current because it offers less resistance). This is especially important with longer cords because a current loses some voltage as it travels over a conductor, and this can affect the performance of a device (such as a power tool) on the other end. When the voltage drops, any electrical equipment on the cord will pull more current to compensate for the lost voltage. This generates more heat, which causes damage to the tool. The longer the conductor, the greater the voltage drop. Contractors usually use a 12/2 extension cord to run their tools, and you should, too.
Typically, extension cords are available in 10, 12, 14, 16, and 18 gauges. An 18-gauge cord is the size normally used for very small loads such as lamps or clock radios.
The following table shows typical extension-cord lengths and gauge combinations.
No comments:
Post a Comment