![]() That is why you’ll need a #2 gauge wire for both aluminum and copper-clad aluminum wire to power up a 100 amps sub panel easily.įollowing the NEC or national electric code, the rule is important when installing a 100 amps sub panel in your house because the NEC rule will be able to provide you with the right sized wire and amperage it to operate with the sub panel.īelow is a brief discussion on what the NEC rule describes when it comes to choosing the right sized wire for a 100 amps sub panel: NEC code for wire size: In addition to that, the aluminum wiring requires a larger diameter wire. However, some people recommend using the #2 AWG aluminum wire for the 100 amps sub panel because it has a lower conductivity than copper wires. The wire must go inside a minimum of 1.25 inches, and schedule 40 or 80 PVC electric conduits for underground service. When installing the #4 AWG copper wire in the sub panel, you should take the necessary steps to secure the wire from any unwanted occurring. Generally, these two wires have the amperage and Gauge rating that is ideal and suitable for the sub panel. However, the ideal and recommended wires for the 100amp sub panel to power up a medium-sized house is the #4 AWG or #2 AWG aluminum wire. There is a variety of wires available to use in a 100 amp sub panel. Generally, the NEC rule indicates that the wire should not hit more than 80% of its electric supply.Ĭonsidering that, you need to follow the rules and regulations properly to power your house using a 100 amp sub panel. The NEC rule provides us with the proper guideline regarding any electrical work and eases the effort. In addition to that, you should always follow the NEC rule when choosing the wire for a sub-panel. You need to choose the right type of wire for your electrical sub panel.īecause choosing the wrong wire may not be able to suit the electric flow and cause a lot of nuisances. Generally, wiring is one of the most essential parts of electrical work that is being done to ensure proper power supply throughout the house. You should make sure that the wire you are using to run 100 amps up panel should be sufficient to the amperage of the sub panel to provide you with proper electricity flow. Generally, the wire that is suitable to run a 100amp subpanel is #4 copper wires or #2 aluminum wires. Generally, a 100 amp sub panel requires #4 copper wires or #2 aluminum wires. When choosing the wire for a 100 amp subpanel, you need to make sure that the wire gorge is sufficient for the amperage of the sub panel. ![]() Generally, the #4 AWG has 85A ampacity but should conduct at most 68 amps. It is ideal to wire the circuit to hit 80% ampacity. My experence in this is I would go with direct burial cable minimum of 3/0 AL reason for a AL as opposed to copper is if if starts to fault copper will keep working and also send power into the ground without you knowing before it faults where AL will just burn through and you will know it now, I also would suggest to put it in pipe that way if ever built or paved over all you need to do if it goes bad is pull it out and back in and with 3/0 AL you have the ability to go up to 200 amp service down the road just my thoughts good luck.When running the subpanel, you should never put the circuit under 100% ampacity. Aluminum wire loses a lot of conductivity relatively quickly.especially if it gets water in it. Go with 2/0, 2/0, 2/0.and you'll never regret it. UD triplex, Or go with 2/0 2/0 2/0 #4 that UD quad, That quad will carry a. Posted 21:27 (#2968099 - in reply to #2967911) Subject: Re: Wire size for 100 amp serviceĪt that distance I would use 2/0 2/0 2/0. Any other building 2AL will need to be fused at 90 amps.Ĭheck Voltage drop tables to see if you need to increase the size of the wire to compensate for Voltage drop Minimum size for dwelling (house ) is 2 AL to serve 100 amps. How many volts, copper or aluminum, is it single phase? I work for a power co and we would use 1/0 2 1/0 aluminum in a flexible conduit. Only going to pull Lights small hand tools and maybe a small welder. I need to pull a line to a tractor shed about 150 feet. Posted 20:20 (#2967911) Subject: Wire size for 100 amp service Wire size for 100 amp service Jump to page : 1 Now viewing page 1
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