CAPACITY CHARTS = Capacity is the maximum current that a conductor can cray continuously under the-conditions of use without exceeding its temperature rating: Cu rent is measured In amperes or“amps.” You mst use the correct size wire fot the current (oad) requirement of the circuit to prevent the wire from overheating + The number sad type of dialectical devices connected 108 circuit determine the capacity requirement of the redactor Usually, & general-purpose house circuits designed for 20:amps.