100 amp service wire size chart free#

Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (30☌) Maximum Allowable Ampacities for Conductors in Free Air (30☌) Maximum. Not Exceeding (Amperes) Note: View wire size charts from the list below. 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. Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc. Subpanel will power yard lights, bbq island, and workshop/shed (160sq ft with basic contractors table saw, drill press, etc.). Ok, that makes sense.Īnd I would think it still applies to my new 100 Amp branch circuit. Loads on subpanel: 100amp breaker at main. 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.

100 amp service wire size chart code#

Many people say using 4 AWG wire is fine. (A) National Electric Code (NEC) Table 310-13 identifies acceptable types of underground service entrance cable. 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.

For a 200-amp wire spanning over 200 feet, choose a 500 kcmil copper wire or a 1000 kcmil aluminum wire. You should increase wire size by 20 for every extra 100 feet run to account for voltage drop. Suggesting the burning scrap wire to remove the insulation will result in a ban. According to the NEC, the wire size for 200 amp service is a 2/0 AWG copper wire or 4/0 AWG aluminum wire. Do not post encouraging or mocking suicide, mental illness, or drug use.Ħ.

No illegal, unethical, or disturbing subject matter. Feeders such as this are almost always done using aluminum due to cost. That tells you that for 75 C wire in conduit (the wire may be rated 90 C, for various reasons 75 C is the one you usually need to work with for this), the choices are 3 AWG copper or 1 AWG aluminum or larger. Example: Blogs, articles, news sites, YouTube channels, items for sale, ect.ĥ. Minimum Wire Size For that, you go to an ampacity table. 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.