AMPACITY CHARTS - City Electric Supply

1 1099 Thompson Road, SE Hartselle, AL 35640 Phone Fax Amperage is a measure of the electrical current flowing through a circuit. Current is measured in amperes or "amps". Youmust use the correct size wire for the amperage requirement of the circuit to prevent the wire from over heating. The number and type of electrical devices connected to a circuit determine the amperage requirement of the circuit. Usually,a general purpose house circuit is designed for 20 amps. Lighting circuits may be designed for only 15 amps. To calculate the amperage for a circuit, first add up the wattage of all the electrical devices that will be on the circuit. Then,divide the total wattage by the voltage of the system, 110 or 220, and that will give you the expected current or Gauge SizeCopperAluminum60 C(140 F)75 C(167 F)90 C(194 F)75 C(167 F)90 C(194 F)NM-BTHWTHWN-2 THWXHHW-2UF-BTHWNTHHNTHWNTHHN---SEXHHW-2 SETWHN-2---USE---USE------XHHW---XHHW--- 14151515------12202020151510303030252584 0505540456556575506047085956575385100110 7585295115130901001---1301501001151/0--- 1501701201352/0---1751951351503/0---2002 251551754/0---230260180205250---25529020 5230300---285320230255350---310350250280 500---38043 0310350600---420475340385750---475535385 4351000---545615445500 WARNING!

2 Installation of electrical wire can be hazardous, if done improperly, can result in personal injury or property damage. For safewiring practices, consult the National Electrical Code and your local building Size and Amp RatingsCerro wire L L C CHARTS