At a 100-foot distance, there will be some voltage drop. The correct wire gauge for a 30 amp circuit wire size with 100 feet of wire is 8 AWG (American Wire Gauge). This will help reduce voltage drops and ensure a safe installation. For the longer run, you’ll need a larger wire size to compensate for a voltage loss. What size wire for 30 amp breaker depends on the electrical load and voltage drop. What Gauge Wire for 30 amp 100 Feet Away? These minimum 30 amp wire size chart are safe for the current level flowing through the conductor. A 60-amp double-pole breaker requires a minimum of 6-gauge wire.A 40-amp circuit double-pole breaker requires a minimum of 8-gauge wire.A 30-amp single-pole and double-pole breakers require a minimum of 10-gauge wire.A 20-amp single-pole breaker requires a minimum of 12-gauge wire.A 15-amp single-pole breaker requires a minimum of 14-gauge wire.The correct wire gauge for each typical household circuit is as follows. A 12-gauge wire is safe up to 20 amps and should be used only on a circuit where the current will not exceed this value. This higher current can damage the thinner wire, melt the insulation, cause short circuits, electrical fires, and even lethal shock. Testing results on solid aluminum wires found that copper wires were more conducive to less heat, making them safer. The standards resulted from experimentation on the ampacity that wires of various thicknesses could withstand before being compromised. Your house’s electrical wiring code standards are there for excellent reasons. A larger breaker on a thinner wire will allow more current over the wire before tripping. The circuit breaker installed on a circuit is of a specific size to protect a certain wire gauge. You should not use a 30-amp circuit breaker on a 12-gauge wire. Can You Use a 30-Amp Breaker on a 12-Gauge Wire? In this circumstance, a 30-amp breaker with 10-gauge wire for the conductor would be the appropriate solution. This requirement is especially true if multiple devices are on the same circuit. These electrical appliances draw a substantial current, requiring a wire gauge capable of withstanding the current demand. These are the more power-hungry devices such as: The AWS or American Wire Standard indicates standards with minimum wire gauges that can be used safely on circuits with a specific ampacity.Ī 30-amp circuit intends to provide power to medium-sized appliances in the home. If the wire gauge is too small, the circuit breaker will not trip the circuit before the current overload damages the wire. The circuit breaker’s purpose is to interrupt the current flow before the excess current damages the conductor, resulting in a dangerous outcome. The sizing of circuit breakers is according to the wire gauge used in the circuit. While using a thicker gauge wire than this on a 30-amp circuit is possible, you should consider 10 gauge as the thinnest possible gauge. Conclusion What Wire Size for 30 Amp 240 Volt Circuitįor safety, the minimum wire gauge for use in a circuit with a 30-amp breaker is a 10-gauge wire.
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