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50 amp wire size aluminum2/29/2024 ![]() In that case, you simply need 62.5 * 1.2 = 75 ampacity wire for a 50 amp device. While also balancing for 20 % voltage drop. And you require your device somewhere 100 feet away. Suppose, you were using 6 gauge wire for a 50 amp. So, if you lose 20% voltage when distance increases, what do you do then? Of Course, avoiding the smaller, you simply choose a bigger size wire. Simply put, you have to compensate for the 20% voltage every 100 feet. Voltage drop is a key factor to consider when deciding gauge size for 50 amp. Check out how a 15 amp switch would work with a 20 amp circuit. That is why the perfect choice for 50 amp is a 6 gauge wire with 65 ampacity. But it may create a bit of inconvenience due to the bigger wire being heavier and stiffer. Which is 65A with a 6 gauge wire size.Īnd if bigger is good, then it means using 4 gauge wire for 50 amp would also work. So the closest wire that we can use for 50 amps is the bigger one. Remember when we said smaller would pose serious problems like but bigger is fine. We have either the 50A wire or the 65A wire. Well the formula says you should use 62.5 ampacity wire to be exact. Wire ampacity = 50A/0.8 = 62.5A wire (0.8 for the 80% rule set by NEC) Let us calculate the ampacity for the 50 amp wire. NEC suggests using an extra 20% on the top of 50A ampacity. Trying to create a 50 amp current with a 50A ampacity wire won’t work. Let’s check all the factors that must be considered! Factor 1: NEC 80% Rule And that factor is the 80% breaker rating rule given by the National Electric Code (NEC). The thing is that you are leaving out an important factor. But you might think 4 gauge should be the right and appropriate choice with 50 amp. The correct gauge size for 50 amp is 6 gauge wire. To suit 50 amp ampacity you will usually encounter 3 AWG standard wire gauge sizes: If you have any questions please feel free to give us a call at 85 or send an email through our support page.Conclusion Factors for Choosing 50 Amp Wire Size We cut 6 gauge THHN by the foot and offer it in several different colors at a great price! Please click here to view our 6 AWG THHN Building Wire page. We greatly appreciate the photos, Steve, and glad everything worked out for you! ![]() Steve buried the 6 AWG THHN copper stranded wire inside a conduit which can be seen below:īuy 6 AWG Wire by the Foot and Cut to Length ![]() I needed to run about 95’ of 6awg 240V 50A service from my house panel out to a new woodshop, and being able to get 100’ 6 AWG THHN/THWN spools at a good price from you worked out well!" My loads will be significantly less than that to run various tools individually, as well as a compressor and vacuum. "I put in a 100A box in the new shop, but am only feeding it from a 50A breaker in the main panel from the house service. Steve purchased our 6 AWG THHN/THWN Copper Building Wire for his project. Steve needed to run 50 amp service from his main panel in his home to a 100 amp breaker box (shown below) in his new shop. Our customer Steve, a skilled project engineer sent in these pics from a home project he recently completed. Many of our customers here at Wire & Cable Your Way are looking for electrical wire to service their new backyard woodshop, like this one shown above.
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