Table of Contents
How big of a wire do I need for 30 amps?
10
For a maximum of 30 amps, you’ll need a wire gauge of 10. The most common household item that requires a 30 amp circuit is a central air conditioner.
What size wire is good for 35 amps?
Wire Size & Amp Ratings
| Copper | ||
|---|---|---|
| 14 | 15 | 20 |
| 12 | 20 | 25 |
| 10 | 30 | 35 |
| 8 | 40 | 50 |
How many amps can you run on 12 gauge wire?
20 AMPS
Size & AMP Ratings
| NM, TW, & UF WIRE (Copper Conductor) | SE CABLE (Copper Conductor) |
|---|---|
| 12 AWG – 20 AMPS | 6 AWG – 65 AMPS |
| 10 AWG – 30 AMPS | 4 AWG – 85 AMPS |
| 8 AWG – 40 AMPS | 2 AWG – 115 AMPS |
| 6 AWG – 55 AMPS | 1 AWG – 130 AMPS |
What size wire for 30 amp service?
The minimum wire size that is allowable for use with a 30-amp breaker is 10 gauge.
How do you calculate wire size?
The formula for calculating cable size for single phase circuits is wire circular mils = (conductor resistivity)(2)(amps)(one way distance in feet) / allowable voltage drop. This formula is based on Ohm’s Law.
What size wire for amperage?
Sixteen-gauge wire, measured by the American Wire Gauge standard, carries a current of 22 amperes for chassis wiring and 3.7 amperes for power transmission. This gauge of wire is 0.0508 inches in diameter and features a resistance of 4.016 ohms per 1,000 feet.
What is the maximum amperage for 12 gauge wire?
A 12-gauge wire can carry between 15 and 20 amps for normal electrical wires. When wiring chassis, 12-gauge wire can carry a maximum of 41 amps along the metal conductor. The conductive part of a 12-gauge wire is 0.0808 inch in diameter.