What is Ampacity :

Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Current is measured in amperes or “amps”.

Wire Ampacity Definition :

• The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor. Usually, a general purpose house circuit is designed for 20 amps. Lighting circuits may be designed for only 15 amps
• To calculate the load requirement 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, typically 120 or 240, and that will give you the required current or amps.

Wire Ampacity Chart :

Frequently Asked Questions about Ampacity

What does ampacity mean?

Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Current is measured in amperes or “amps”

How is ampacity determined?

Ampacity can be calculated by dividing the Wattage by the rated voltage. The quotient is the expected Amperage of the circuit.

What is the ampacity of 14 gauge wire?