What size wire for 100 amp subpanel

To simplify the answer in one short burst, you would need a 3-gauge wire or a 3 AWG wire for a 60-ampere sub panel situated 150 feet away. The wire size would be the same for both copper wires and aluminum wires. This article will address all of the challenges and concerns about the wire size for sub panels at a variety of distances, …0. I am installing a 100 A sub panel in my barn which is 170 feet from the main panel. 100 feet will be underground and 70 feet will be through the crawlspace underneath the house. My main panel is 200 A. I want to use aluminum wire. The barn measures 28' x 50'. Within that, there is a 12' x 20' workshop.You'll of course need the correct 60A two pole breaker for your pole's panel, as well as two 8' grounding rods driven 8' or more apart at the greenhouse and connected to the subpanel at the greenhouse with 6AWG bare copper to form a grounding electrode system so that wayward natural electricity has a path back to nature.Apr 17, 2022 · To calculate the breaker size, simply divide the adjusted wattage by 240 volts to find the rated amperage needed for your subpanel. Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of the breaker. For example, if the load calculation comes out to 48 amps, you should use a 50-amp breaker ... Jun 7, 2023 · What wire size for 100 Amp sub panel 100ft in length from 200 Amp main panel? 0. What size aluminum ser do I need for 100 amp sub panel 10 feet away from 200 amp main? 0. Gostaríamos de exibir a descriçãoaqui, mas o site que você está não nos permite.Oct 2, 2023 · The Correct Wire Sizes for a 50A Sub Panel. According to the size chart recommendations from the 2002 edition of the NEC, the minimum wire for 50 amps should be 6 AWG for copper. For aluminum, it should at least be 4 AWG. However, these answers assume that there’s no voltage drop to consider. The NEC considers a 5% voltage drop as the maximum ... House is wired for 400 amp service.. 180' total... (80' from main panel to house wall exit.. underground feed 100' to ... 125 Amp Sub Panel Wire Size. Thread starter millwoodva; Start date Apr 28, 2017; Status Not open for further replies. M. ... If the 125A subpanel were fed from a 90A breaker at the main panel, ...For that service would use URD Aluminum 4 conductor cable (need 2 hot, neutral and should have separate ground to shop, grounds isolated from neutrals in shop panel. for 300 feet for 100 amp rated service I would use Aluminum direct burial 1/0-1/0-1/0-1/0, the forth can be as low as #4 for the ground (but also in conduit, even if in conduit ... A minimum of 4-gauge wire and 1 1/4-inch conduit is required for 100-amp service. Buildings that have gas heat may not need any more than 100-amp service. The service size of a bui...I want to add a 100 amp sub-panel from a 200 amp main in an attached garage. It will be about 100 feet from sub to main. ... What size wire should I use to feed a subpanel in my garage? Share. Improve this answer. Follow edited Sep 26, 2019 at …Yes, you can use a 100 amp subpanel with a 200 amp main panel. It is important to ensure that the wiring from the main panel to the subpanel meets local electrical codes and that all wires are sized appropriately. You’ll also need to make sure the wire gauge used for your feeder line is at least 6 AWG copper or 4 AWG aluminum.For a 100 AMP service, the recommended wire sizes are 4 AWG or 2 AWG for copper wiring and 2 AWG, 1 AWG, or 1/0 AWG for aluminum or copper-clad wiring. If the distance is more than 50 feet, it’s advisable to use #2 AWG copper wire. For underground service, you can install the wire inside a 1.25-inch PVC conduit, either Sch 40 or Sch 80.May 30, 2020 ... ... wiring-determining-wire-size-and-voltage-drop-for-amps ... 100 Amp Subpanel Installation. BrettleyBuilt•66K views · 29:49. Go to ...I intend on putting a 100 amp sub-panel in the shop. ... Going to a larger feeder breaker 90 or 100 requires a larger wire size but I doubt you will need that much power. ... I say go ahead and use that to bring 150A to the subpanel. That will need 150A breaker protection, but your main panel's main breaker already is 150A.Jul 1, 2019 · 0. I am installing a 100 A sub panel in my barn which is 170 feet from the main panel. 100 feet will be underground and 70 feet will be through the crawlspace underneath the house. My main panel is 200 A. I want to use aluminum wire. The barn measures 28' x 50'. Within that, there is a 12' x 20' workshop. Sep 18, 2023 · When installing a 100 amp subpanel, it’s important to ensure that the ground wire is the proper size to provide adequate safety. In general, a #6 AWG copper wire is recommended for a 100 amp subpanel ground wire. This size should be sufficient to handle the electrical load and provide protection in the event of any electrical faults. 2. The 60A breaker feeding the 6/3 (I hope it's copper) will limit the current to the subpanel to 60A per 120v leg. The panel must be rated for a minimum of the size of the breaker feeding it. You can put as many breakers in the panel as the panel will hold, you just can't concurrently use loads that will exceed 60A per 120v leg.I would look into XHHW if your going to go with aluminum. #2 aluminum is good for 90 amps at 75c. Since a 90 amp breaker is listed in 240.6 (A), you really can't go next size higher. Three #1 and a #8 XHHW should fit swimmingly in a 2" PVC. “If you chose not to decide, you still have made a choice” Rush. C.The National Electric Code recommends that to wire a 100 amp sub panel 300 feet away from the main panel, you should use 2/0-gauge aluminum wire or 4/0-gauge copper wire. The size of the wire needed depends on several factors, including the length of the run, the amperage rating of the circuit, the temperature rating of the wire, and the ...For aluminum wires, a #3/0 AWG wire is typically used for a 100-amp subpanel having a distance of 100ft. As the finalized size of the wire is based on ...What size tech cable for 480 feet 100 amp? This is a voltage drop to establish wire size question. For a correct answer to this question two values are needed. One value needed is the voltage and the other is whether it is three phase or …I'm wiring a 100 AMP garage sub-panel from a 200 AMP main in my house. ... subpanel; or ask your own ... What size wire do I need for a 100 amp service from meter base? Related. 0. 100 AMP sub panel from 200 AMP main. 3. Second 100 amp breaker inside existing 200 amp residential panel for new detached garage. 2.And, you round up to the next available breaker size. That means usually: 100A is #3 copper ($600/100ft) or #1 aluminum ($175/100ft). 125A is #1 copper or #1/0 aluminum ( you need to call it 120A feeder, but you get to round up to 125A breaker since 120A is not made.) If you need full declared 125A you'd need 2/0 aluminum.Of course you can, you can add the 100 amp breaker to your 200 amp as long as it isn't overloaded, to start adding the subpanel you must first calculate how many yards it will be from the main panel to the subpanel, there is a formula that calculates how much friction will be on the wire at the connecting distance, then you can look at a wire …Wire Size Chart and current limits for wire gauges. Toggle navigation WireSizeCalculator.net. Home; Calculators; Tables; ... Wire Size Chart and Maximum Amp Ratings. Source: NFPA 70, National Electrical Code, Table 310.15(B)(16) SIZE 60°C (140°F) 75°C (167°F) 90°C (194°F) 60°C (140°F)A 100 amp subpanel typically requires 6 AWG copper wire (or 4 AWG aluminum wire) and 10 AWG copper wire for the grounding circuit. The minimum recommended amperage rating of a circuit breaker or fuse is 115% of the subpanel’s-load capacity, so a 100-amp subpanel will require a minimum of 115-amp circuit breaker or …Final Thoughts. For a 100-amp service, the minimum required conduit size is 4 AWG to 1 ¼ inch. Different wire sizes are available depending on the service panel. That’s why the safe wire size for a 100-amp service panel is 4 AWG to 1 ¼ inch. It’s been accepted globally as AWG standards are used to measure wire.Jan 21, 2019 · Ground size for 100 amp sub panel 200ft away. I would like to install a 120/240 volt 100 amp sub panel on a detached garage that is about 200 ft away. I have read that one should strive for a voltage drop of less than 3% and from what I can tell this means I need #2 cu or 1/0 al for the two hot and neutral. When running cable to a subpanel for a home addition, pay attention to the size of the wire and the amperage of the breaker. By John Williamson Issue 314 ... The home was built with a 200-amp electrical panel that’s located in the garage. I decided to install a 100-amp subpanel to supply the new rooms.Wire size for 100 amp subpanel in detached garage 215' away. 0. What wire size for 100 Amp sub panel 100ft in length from 200 Amp main panel? 0. Electrical Question about a 100 amp sub-panel to a 100 amp sub panel in my out-building. 0. Wire size. 125 feet underground to 100 amp sub panel. 2.May 11, 2022 ... How To Wire A Sub Panel - VERY DETAILED INSTALLATION! Start To Finish ... How a 100 Amp Sub Panel Breaker Box was installed In My 30 X 50 Shop.100 amp sub panel wire size: Generally, the wire that is suitable to run a 100amp subpanel is #4 copper wires or #2 aluminum wires. You should make sure that ...How to Find the Right Wire Size for 100 Amp Subpanel in AWG? Wiring Installation of a 60A Subpanel for 120V & 240V. The following wiring diagram shows the installation of a 60A subpanel for both 120V and 240V. You may use the current rating according to the system requirement i.e. 50A, 60A, 100A, 150A and so on.I was thinking of using a 100 amp subpanel and putting in a 40 amp double pole main breaker. That should give me plenty of room to grow. ... (32A) most of us would proscribe a wire size bump at about 110 feet, so in your case, 2-1/2 bumps (5 …Subpanel: 100 amp Square D, 6 breaker/12 circuit: ... You also don't need a wire size bump for distance.. for a 240V circuit I don't even bother crunching the numbers for less than 150’. Only one circuit to an outbuilding. There is one snag with your "subpanel outdoors serving shed" plan.Well, the National Electrical Code (NEC) requires a properly sized ground …A 100 amp subpanel typically requires 6 AWG copper wire (or 4 AWG aluminum wire) and 10 AWG copper wire for the grounding circuit. The minimum recommended amperage rating of a circuit breaker or fuse is 115% of the subpanel’s-load capacity, so a 100-amp subpanel will require a minimum of 115-amp circuit breaker or …If the service wires were 1 foot long, the lives could be #2 (because it's a service, subpanel feeders need #1) and the grounds could be #6. AWG is sized exponentially, so "4 AWG difference in size" is always a factor of 2.52. So take the "kcmil" size of the hot wire you choose, divide by 2.52, and choose a ground wire with that …You will need a single 100 amp 2 pole breaker to feed the sub panel. 2 -50 amp breakers is not acceptable by ... at all, at these wire sizes. Feed the subpanel with a 50A breaker. Feed the kiln directly off the other 50A breaker and (electrically) bypass the subpanel altogether. It's OK if the wires are routed through the subpanel ...Also as a contractor, I wouldn't run 2-2-2-4 to a 100 amp panel that far. Loads change and I don't need call backs to fix that problem. Here in MN, you couldn't run that size for a 100 amp feeder to anything but a dwelling. That has changed now, but I still only run that size to dwellings.2. The 60A breaker feeding the 6/3 (I hope it's copper) will limit the current to the subpanel to 60A per 120v leg. The panel must be rated for a minimum of the size of the breaker feeding it. You can put as many breakers in the panel as the panel will hold, you just can't concurrently use loads that will exceed 60A per 120v leg.Oct 1, 2023 · 3 AWG copper wire is the 60 amp sub panel wire size if the main’s 150 feet away and assuming the voltage drop reaches as high as 30%. That’s because if we factor in the 80% rule and the 30% voltage drop, such a setup will require a wire that can handle 97.5A in reality. If the main panel’s over 200 feet away, you can use a 4 AWG copper or ... What Size Wire for 125 Amp Service. With this 125a wire size and breaker guide, you’ll be empowered to ensure your system is up-to-date and can handle all your electrical needs.. So don’t risk it; take the time to think through your electrical project from start to finish, and you’ll be sure to get the power you need without any safety risks or …OR maybe the panel he is feeding the subpanel from won't hold any breaker ... Not sure how far it is but might be cheaper in wire and conduit size and the pulling factor. F. fmtjfw Senior Member. Location Fairmont, WV, USA. Jul 17, 2014 #12 rhovee said: What about using the 100 amp breaker as a disconnect and landing the wire on a 60 ...It varies for several reasons, but you generally need 1 AWG copper wire …Taking a relaxing drive listening to your favorite songs is one of life’s pleasures. You can cruise along with your music turned high, and not worry about disturbing the neighbors....May 13, 2022 · Sub Panel Connection. While installing a subpanel, an electrician generally first runs a feeder cable to the subpanel from the main panel. A three-wire cable with three insulated conductors and a bare copper ground wire is conventional. A 100-amp subpanel needs #4 copper wires or, more typically, #2 aluminum wires. The ground wire being #10 instead of #8 is allowed. If the cable were a larger size, you could run a larger breaker. 6 AWG copper / 4 AWG aluminum can be breakered as large as 60A; 3 AWG copper / 1 AWG aluminum allows a full 100A. Yes, you can put a 100A subpanel off a 100A main panel.I'm wondering if I can hook up a 100amp subpanel off of it. If so what size wire to go with? It would be on the same wall next to it within 12 inches. Do I have to use a conduit between the two, or does it have to exit the bottom of the main to the top of the subpanel? Also, all I'm seeing at a local store are 100 amp main boxes.For a 100 AMP service, the recommended wire sizes are 4 AWG or 2 …Taking a relaxing drive listening to your favorite songs is one of life’s pleasures. You can cruise along with your music turned high, and not worry about disturbing the neighbors....Choosing the right size wires for your sub panel is a matter of safety. It varies for several reasons, but you generally need 1 AWG copper wire for a 100 amp sub panel. Whether it be copper or aluminum, let’s take a look at what size wire you need for a 100 amp sub panel that’s 200 feet away. For amateur craftsmen, building a new structure ...Mar 2, 2012 ... What the InterNachi says is #3 AWG for a remote distribution panel. 19th edition of Canadian Electrical says #3 RX 90XLPE copper.Start by digging a trench that is 18-inches deep; this wiring will run from the main panel into your garage sub-panel. You can use 1-1/4” PVC conduit if you are running a 100-amp sub-panel; if you have a 50-amp sub-panel, go with 1” PVC conduit. You will want to run your conduit from the garage to the main breaker located in your house.Updated on February 8, 2024. According to the NEC, the wire size for 200 amp service is a 2/0 AWG copper wire or 4/0 AWG aluminum wire. You should increase wire size by 20% for every extra 100 feet run to account for voltage drop. For a 200-amp cable size spanning over 200 feet, choose a 500 kcmil copper wire or a 1000 kcmil aluminum wire.Feb 21, 2021 ... This video goes over the process used for adding a sub panel to my 30 X 50 Metal Building. This unit is set up for 100 amps which is one of ...What size tech cable for 480 feet 100 amp? This is a voltage drop to establish wire size question. For a correct answer to this question two values are needed. One value needed is the voltage and the other is whether it is three phase or …2 x 550' x 100 Amperes x 0.0000608 ohms/ft = 6.688 volts. Aluminum conductor means using 350 kcmil conductors. 2 x 550; x 100 x 0.0000605 = 6.655 volts. When you start working with this size wire, you're going to need special tools and knowledge. Which means it's likely out of the DIY realm. If you want 120/240V at the barn, and not just 240V.May 13, 2022 · Sub Panel Connection. While installing a subpanel, an electrician generally first runs a feeder cable to the subpanel from the main panel. A three-wire cable with three insulated conductors and a bare copper ground wire is conventional. A 100-amp subpanel needs #4 copper wires or, more typically, #2 aluminum wires. I went to my local electrical store to buy copper wire to feed my 100-amp subpanel which is 100' from my main service panel. According to NEC Table 310.15(b)(16) I thought I had to use the 60° column, and for 100-amps that is AWG 1 copper. The guy at the store told me I only need AWG 3 copper.Oct 2, 2023 · The Correct Wire Sizes for a 50A Sub Panel. According to the size chart recommendations from the 2002 edition of the NEC, the minimum wire for 50 amps should be 6 AWG for copper. For aluminum, it should at least be 4 AWG. However, these answers assume that there’s no voltage drop to consider. The NEC considers a 5% voltage drop as the maximum ... 100 Amp Sub Panel Wire Size. • A 100 amp sub panel requires a minimum 6-gauge wire for the connection between the main panel and the sub panel. • The ground wire should be 8-gauge for a 100 amp sub panel. • The neutral wire should be 1-gauge for a 100 amp sub panel. • All wires should be copper and rated for use in wet or dry locations.House is wired for 400 amp service.. 180' total... (80' from main panel to house wall exit.. underground feed 100' to ... 125 Amp Sub Panel Wire Size. Thread starter millwoodva; Start date Apr 28, 2017; Status Not open for further replies. M. ... If the 125A subpanel were fed from a 90A breaker at the main panel, ...Taking a relaxing drive listening to your favorite songs is one of life’s pleasures. You can cruise along with your music turned high, and not worry about disturbing the neighbors....What Size Wire for 125 Amp Service. With this 125a wire size and breaker guide, you’ll be empowered to ensure your system is up-to-date and can handle all your electrical needs.. So don’t risk it; take the time to think through your electrical project from start to finish, and you’ll be sure to get the power you need without any safety risks or …When choosing 100 amp service wire size, remember that a 100 amp circuit at 240V can proceed up to 24,000W of electricity. If the run of the wire is significantly long, such as over 100 feet, you should use a larger size out of the sizes described above to accommodate for voltage drop. The ground wire size for 100 Amp service is different.May 20, 2023 · The wire size for AMP service is broken down in the following very useful chart. According to the table above, a 100 amp service necessitates a wire size of around 1.25 inches. Copper is used on wire #4, while aluminum is used on wire #2. The optimal size for larger conductors to maintain the fill level inside the conductor is 1.5 to 2 inches. 1. 20 feet is a short run and voltage drop is not a problem in that short of a distance. Running 2 - 100 amp sub-panels you should run #3 THHN wire to each panel with a 100 amp breaker to feed each one. The NEC recommends 3% voltage drop for either the feeder or the branch circuit and 5% total for both.Jun 6, 2017 ... ... wire sizes for breakers and 100 amp electrical service conductors. We hope you enjoy and learn from out how to videos. how to wire a breaker ...An approximate cost of the sub-panel installation for a workshop can be: 60 amp – $400 to $600. 80 amp – $500 to $800. 100 amp – $400 to $1,000. Since you will have to use a few electrical appliances in the workshop, it is best to use a 60 amp sub-panel as the minimum panel.Aug 20, 2023 · I am adding a 100 amp sub panel off the 100 amp main breaker. Don't understand the directions on what wire size to use. I bought the PowerMark Gold 100 Amp 32-Space 32-Circuit Indoor Main Breaker Circuit Breaker Panel. I was going to use a #6 stranded wire for for ground and 3 #3 stranded wire. Sep 13, 2023 ... 00:00 · What size wire is needed for a 100 amp service? ; 00:19 · What does 100 Amp Service mean? ; 00:45 · Factors influencing wire size ; 01...A 100 Amp panel could have a huge load - as much as 80 Amp continuous, or a tiny load - as little as 20A (with occasional higher amounts). ... Wire size for 100 amp subpanel in detached garage 215' away. 1. What size wire do I need? 225' run/100 amp subpanel. 0. Running a 50amp 240V line 300 feet to a shed.When installing a 60 amp subpanel, it’s important to choose the right size wire for grounding. The grounding wire is critical for preventing electrical shocks and ensuring safe operations of the subpanel. In this article, we’ll discuss what kind of wire needed for a 60 amp subpanel. Understanding Gauge Wires and Ampere Capacity …The Correct Wire Sizes for a 50A Sub Panel. According to the size chart recommendations from the 2002 edition of the NEC, the minimum wire for 50 amps should be 6 AWG for copper. For aluminum, it should at least be 4 AWG. However, these answers assume that there’s no voltage drop to consider. The NEC considers a 5% voltage drop …What size wire do I need for 200 amp sub panel? ... Make sure that your home’s electrical system is large enough to support the subpanel. Can you run a 100 amp sub panel off a 200 amp main. If you have a 200 amp main service and a 100 amp sub panel, you can run them off the same service.Sep 18, 2020 · But 75 would be enough so it’s best to jump up to 90 or 100. 75a = 2 awg wire with 2.56% voltage drop this would also handle 90 amps to go up to 100 amp 1 awg wire would be needed. With older panels finding anything larger than is doubtful. With max loads listed #2 and a 90 amp breaker would give additional room. Basically the breaker size protects the wire, So the breaker should not be higher amperage than the wire rating, however can over size the wire to meet voltage drop requirements. load calculations are for what minimum size panel/service needed but not the actual service rating if the breaker from the service side is a 100amp breaker feeding this then wire …For that service would use URD Aluminum 4 conductor cable (need 2 hot, neutral and should have separate ground to shop, grounds isolated from neutrals in shop panel. for 300 feet for 100 amp rated service I would use Aluminum direct burial 1/0-1/0-1/0-1/0, the forth can be as low as #4 for the ground (but also in conduit, even if in conduit ... Taking a relaxing drive listening to your favorite songs is one of life’s pleasures. You can cruise along with your music turned high, and not worry about disturbing the neighbors....This ensures that the wire can safely handle the maximum load without …Minimum mandatory wire size is based on the breaker rating. There is a mininum wire size which is required based on the circuit breaker rating. That size is #4 copper or #2 aluminum. You get this number by using a quality voltage drop calculator by specifying the breaker amperage and a wire length of 1 foot. e.g. 240V.If the service wires were 1 foot long, the lives could be #2 (because it's a service, subpanel feeders need #1) and the grounds could be #6. AWG is sized exponentially, so "4 AWG difference in size" is always a factor of 2.52. So take the "kcmil" size of the hot wire you choose, divide by 2.52, and choose a ground wire with that …2. The 60A breaker feeding the 6/3 (I hope it's copper) will limit the current to the subpanel to 60A per 120v leg. The panel must be rated for a minimum of the size of the breaker feeding it. You can put as many breakers in the panel as the panel will hold, you just can't concurrently use loads that will exceed 60A per 120v leg.Aug 20, 2019 · Or should I install PVC conduit and pull individual wires and if so what size wire to pull? I would prefer aluminium wire for the cost savings. Additional Details. Main House Panel is a Siemens/ITE Load Center G4040MB1200. Plan is to add a Q2100 100-Amp Double Pole Type QP Circuit Breaker to Main Panel. May 30, 2020 ... ... wiring-determining-wire-size-and-voltage-drop-for-amps ... 100 Amp Subpanel Installation. BrettleyBuilt•66K views · 29:49. Go to ...If the service wires were 1 foot long, the lives could be #2 (because it's a service, subpanel feeders need #1) and the grounds could be #6. AWG is sized exponentially, so "4 AWG difference in size" is always a factor of 2.52. So take the "kcmil" size of the hot wire you choose, divide by 2.52, and choose a ground wire with that …Also, what size wire do I need to run a 100 amp subpanel? A 100 A sub-panel requires a two-pole 100 A breaker - if you want 100 A. You can use #4 AWG 75 deg C or 90 Deg C copper wire in conduit for a 100 A breaker provided the breaker is labeled for use with 75 deg C wire. 3 AWG copper wire is the 60 amp sub panel wire size if the main’s 150 feet away and assuming the voltage drop reaches as high as 30%. That’s because if we factor in the 80% rule and the 30% voltage drop, such a setup will require a wire that can handle 97.5A in reality. If the main panel’s over 200 feet away, you can use a 4 AWG copper or ...For example, you might only connect two 100 amp or one 200 amp sub panel from 200 amp main. However, it’s important that you don’t use more than 160 amps at once. What Size Wire Is Needed For A 100 Amp Sub Panel? Installing a 100 amp sub panel generally requires the use of one of the following options. The choices are:Oct 5, 2020 · The National Electric Code recommends that to wire a 100 amp sub panel 300 feet away from the main panel, you should use 2/0-gauge aluminum wire or 4/0-gauge copper wire. The size of the wire needed depends on several factors, including the length of the run, the amperage rating of the circuit, the temperature rating of the wire, and the ... Jun 6, 2017 ... ... wire sizes for breakers and 100 amp electrical service conductors. We hope you enjoy and learn from out how to videos. how to wire a breaker ...Of course you can, you can add the 100 amp breaker to your 200 amp as long as it isn't overloaded, to start adding the subpanel you must first calculate how many yards it will be from the main panel to the subpanel, there is a formula that calculates how much friction will be on the wire at the connecting distance, then you can look at a wire …I want to add a 100 amp sub-panel from a 200 amp main in an attached garage. It will be about 100 feet from sub to main. ... What size wire should I use to feed a subpanel in my garage? Share. Improve this answer. Follow edited Sep 26, 2019 at …May 4, 2019 ... Today we are running a 100 amp service wire from the house to The work shop. We will wire it into the main panel in the house and also into ...If the service wires were 1 foot long, the lives could be #2 (because it's a service, subpanel feeders need #1) and the grounds could be #6. AWG is sized exponentially, so "4 AWG difference in size" is always a factor of 2.52. So take the "kcmil" size of the hot wire you choose, divide by 2.52, and choose a ground wire with that …Aug 5, 2019 · 389 posts · Joined 2012. #15 · Aug 5, 2019. This is for a sub panel going to an attached garage. The panel is an older Commander. The 90 amp Commander is about $250 whereas a 100 amp Commander breaker will run be about $100. I would have to run #1 aluminum to use the 100 amp commander though as opposed to #2 for 90. 2 x 550' x 100 Amperes x 0.0000608 ohms/ft = 6.688 volts. Aluminum conductor means using 350 kcmil conductors. 2 x 550; x 100 x 0.0000605 = 6.655 volts. When you start working with this size wire, you're going to need special tools and knowledge. Which means it's likely out of the DIY realm. If you want 120/240V at the barn, and not just 240V.Feb 4, 2024May 21, 2019 · Sorted by: 1. At 125’ 4 awg copper would provide 1.79% voltage drop using 4 gauge wire would allow for 70 amp breaker in your main panel. Since this is detached you will want a ground rod also. To save on wire cost you could use #2 aluminum and still have 70a breaker at the main. If you would like to play with wire sizes google southwire ... Feb 6, 2023 · I currently have a 100amp main service box but it is all full and some are even doubled up.I'm wondering if i can hook up a 100amp subpanel off of it? Certainly, that is what sub-panels are for. If so what size wire to go with? The wire should be #3 copper for 100 amps and a 100 amp two pole breaker to feed it. | mfpknjjkp (article) | uezqla.