Q:

# What does a wire capacity chart show?

A:

A wire capacity chart shows the maximum current capacity for a specific wire run. Besides the current-carrying capacity, the chart also shows the wire size, the resistance and the skin effects of an American wire gauge cable.

## Keep Learning

The American wire gauge is a standardized norm used to note the diameter of an electrical conducting wire. The chart displays the diameter in inches and millimeters. It also provides a column with the area of the cable or conductor.

The resistance charted in the table is for a specific conductor. Use the resistance for the respective noted current to calculate the voltage drop across the conductor using Ohm’s law that states that the current that passes through the conductor is inversely proportional to the resistance and directly proportional to the potential difference between the two points.

The current ratings displayed in the chart are for power transmission. The rule of 1 ampere per 700 circular mils determines the current rating value. The skin effect listed in the table is that behavior of alternating current that causes it to distribute itself within the cable, in order that the current density near the surface is greater than the density near the core. It affects the effective resistance of the conductor causing it to increase with the frequency of the current.

Sources:

## Related Questions

• A: The selection of the correct diameter conduit requires the use of National Electric Code tables to find wire type diameters, fill amounts and conduit diame... Full Answer >
Filed Under:
• A: The Home Depot provides a chart that explains the differences in wire nut, more commonly known as wire connector, colors on its website. The chart explains... Full Answer >
Filed Under:
• A: Use a wire gauge amp chart to determine the approximate wire size for an electrical load. There are separate charts for different types of wire. Since the ... Full Answer >
Filed Under:
• A: To read a wire size chart one must examine the column listing various sized gauges of wire, then read across the row to gather the information for that par... Full Answer >
Filed Under:
PEOPLE SEARCH FOR