Insulated wire types like THHN/THWN-2, XHHW-2 and USE-2/RHH/RHW-2 have an insulation temperature rating of 90℃, and any temperature correction factors or ampacity adjustment factors can be applied to the insulation temperature rating. For example, 3/0 AWG copper has an ampacity of 200 amps at 75℃, while 3/0 AWG aluminum has an ampacity of 155 amps at 75℃. Each has a different ampacity for a specified gauge size, and these ampacities are found in NEC® Table 310.15(B)(16) for the calculations in this app. The primary two metals used for electrical conductors are copper and aluminum. For more information on ampacity calculations, please consult our technical resources. All calculations assume a voltage of no more than 2000 volts and that the appropriate NEC® requirements are followed by the installer, engineer or other responsible party. Insulated single conductors are assumed to be installed in conduit or direct buried. Certain installations (such as cable trays and medium-voltage conductors) are not included in this app. ![]() This calculator also complies with the 2020 NEC requirements. This app uses the calculation requirements found in the 2017 National Electrical Code® to determine the ampacity of insulated conductors and certain cable-type wiring methods. 104A x 1.Ampacity Calculator Information & Instructions: So I need an additional 7% added to the Amps to account for voltage drop. Voltage drop: At 100' we add 20% to the Amps. So why is everything else online (besides that linked article) saying that 4 AWG is good for 100 Amps?īy my calculations, I would need 1 AWG. Ok, that makes sense.Īnd I would think it still applies to my new 100 Amp branch circuit. According to the wire gauge chart that the article references, 12 AWG is good for 25 Amps at 75c.Ģ5 Amps x 80% = 20 Amps which is the breaker size used for 12 AWG wire. (NEC 220-2)"Īnd this is the wire gauge chart the article uses: Īn example that I am more familiar with is a 20 Amp branch circuit that uses 12 AWG wire. ![]() But I found a great article explaining the NEC requirement for loading a branch circuit that states: "Maximum loading for any branch circuit is 80% of the rating of the circuit for ampacity of wire for any load. Many people say using 4 AWG wire is fine. In doing research online, I find conflicting information on the correct gauge of wire to use. My current main panel will be replaced with a service disconnect 100 Amp breaker and then my new "main" panel (now technically a sub panel) will be fed with SER cable from the service disconnect panel. I am moving my main panel to a more central location that is more accessible and easier to work on. Suggesting the burning scrap wire to remove the insulation will result in a ban. Do not post encouraging or mocking suicide, mental illness, or drug use.Ħ. No illegal, unethical, or disturbing subject matter. Example: Blogs, articles, news sites, YouTube channels, items for sale, ect.ĥ. No incorrect, unsafe, or hazardous informationīlatant incorrect information or hazardous advice will result with a ban Adhere to the Reddiquette.ĭO NOT post any personal information of any kind. Civil disagreements can happen, but insults should not. ![]() No personal attacks on anyone at any timeīe polite and respectful in your exchanges. After a period of inactivity, this subreddit is under construction and will be available to the public shortly.
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