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30 Amp Wire (100 ft away) = 37.5A × 1.2 = 45A Amperage. For 30 amp service 100 feet away you would need a wire that can handle at least 45 amps. Luckily, the #8 AWG wire has a 50A ampacity. You can use the #8 AWG wire for sub panel 50 feet, 100 feet, and even 150 feet away. If, however, the sub panel is 200 feet away, you have to boost the ...
- 0-40 AWG To Mm2
30 AWG: 0.0509 mm2: 31 AWG: 0.0404 mm2: 32 AWG: 0.0320 mm2:...
- 0-40 AWG To Mm2
26 gru 2023 · 30 Amp Wire at 100 feet distance = 37.5A × 1.2 = 45A Amperage For a 30-amp service of 200 feet, there is a need for wire that can handle 45 amps. 8-gauge wire comes with a 50A ampacity, so we can use 8-AWG wire for subpanels at 50- to 15-foot distances.
The voltage drop V in volts (V) is equal to the wire current I in amps (A) times 2 times one way wire length L in feet (ft) times the wire resistance per 1000 feet R in ohms (Ω/kft) divided by 1000: V drop (V) = I wire (A) × R wire (Ω)
The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30°C (86°F).
This wire size calculator will calculate the appropriate wire gauge for a circuit based on amps, voltage, distance, and load. This website provides a wire size calculator, voltage drop calculator, wire ampacity charts and more.
30 amp wire = 30A x 100% / 80% = 37.5A ampacity. So, with 37.5A ampacity, an 8 AWG wire after 10 AWG wire will perfectly fit 30 amps. The 310-16 code suggests adding an extra 20% of the wire’s ampacity for 30 amps every time the distance increases to 100 feet.
This is an NEC chart (you will find it below) that tells you what size copper or aluminum wire to use for different amp services. Example: What feeder wire size do you need for 200 amp service? Simple. You just check the NEC feeder sizing table and see that, for 200 amp service, you will need either a 2/0 AWG copper wire or 4/0 aluminum wire.
