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If the length increases, the resistance will also rise, elevating the amount of heat generated. The distance doesn’t affect the amp rating, not directly. However, if your objective is to use 8AWG wires, restrict the length to 62 feet (120V) and 124 feet (240V). In the case of 8AWG conductors, if the wire is too long, you have to increase the size to 6 or 4AWG to prevent the voltage drop from rising. If the wire is too long, the voltage drop will increase because of a spike in the resistance. The voltage drop is a significant threat to circuits and appliances. While you can run 8 AWG aluminum wires for 53 feet in a 120V circuit, 106 feet in 240V and 213 feet for 480V Their objective is to keep the maximum voltage drop at 3 per cent or less. You can run 8 AWG copper wires for 62 feet in a 120V circuit,124 feet in a 240V circuit and 249 feet in 480V.

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Let’s look at a table to check if this wire can handle these amps or not. Regardless of what you choose, you should be fine so long as you remember to keep appliances and circuits above 55 amps away from your 8-gauge cables. They can place a larger load on the circuit down the line knowing that the wiring can take it. This shouldn’t stop you from using 8AWG cables for circuits with lower amp ratings.Ĭonsumers use 8AWG cables on 30A circuits as a way of future-proofing their homes.

After all, 8AWG is thicker and more expensive. In other words, you can afford to pair appliances with a lower amperage with 8AWG wire.Īdmittedly, using 8AWG conductors for 30A applications wouldn’t make sense when you can use 10AWG wire. In this case, the wrong application is any task that forces more than 55 amps of current to pass through the 8AWG conductor. Otherwise, the wrong application will melt the wires and start a fire. You must learn to identify the amperage of 8AWG wire based on factors like the material and distance. But then it falls to 30-45A for aluminium wires. That figure jumps to 55 amps if you use copper wires. Though, non-metallic cables can only withstand 40 amps. However, the chances of an 8AWG cable safely carrying 55 amps are low. But what is the amp rating of 8-gauge wire? How many Amps Can 8 Gauge Wire Carry?Īccording to NEC, 8-gauge copper wire can handle a maximum of 40-55 amps while 8 gauge aluminum wire can handle a maximum of 30-45 Amps.Ĩ gauge wire can withstand 40 – 55 amps. The last thing you want is to melt the wires because you exceeded their amp rating.

Are you thinking about installing an 8-gauge wire? You cannot proceed without first comparing the capacity of the cables to the applications.