ground wire size for 70 amp sub panel

Neither one really answers my question for a 70 amp circuit. Also, match each breaker to the correct wire size. Youre wiring an electrical service panel and youre curious about using QO vs QOT breakers. The following guide also highlights the grounding procedure for that breaker box. Its important to consult an electrician if youre not sure, as they can calculate the voltage drop for you. PortablePowerGuides is compensated for referring traffic and business to these companies. If you are unsure about wire size, ask an electrician to make the proper selection. A 4-gauge cable can accommodate 70 amps, but only if the conductors are copper. Long cables are more likely to overheat because they have a higher resistance. Safest way of temporarily working with a failed 4-wire outbuilding subpanel (one missing hot leg, neutral bonded ground on both ends)? The inspector had me drive another one, I think the requirement was at least 12 ft from the first, and at least 8 ft down, or somewhere along those lines. This table lists the minimum sizes of grounding conductors for grounding To learn more, see our tips on writing great answers. wires are compatible with your new 70-amp circuit breaker, keep in mind before buying wire for your new 70-amp breaker, wires is because the wires size matches the size of the breaker. Step-by-Step Guide to Feed a Subpanel from a Main Panel 1. What size ground wire is required to tie a sub panel to a main panel for a 50 amp supply to sub panel. Pay attention to the temperature. However, you should always check the wire gauge before buying any wire. Visit the Terms of Use and Privacy Policy for this site. Also, I suspect his real question was about wire size to run in the four wire feeder for the ground. As a reminder, your feeder will be 4 wires, the two hots and the neutral will be #1AL (unless you've de-rated the neutral to 70% or from specific load balancing calculations if that is allowed in your area). Ur ground has to provide the easiest path for electricity and stainless steal or galvanized pipe is not even close to copper which is what most of ur wiring is. It does sound like the electrician screwed you. There are some common devices that require continuous current like light bulbs, chargers, and electric fans. At least two problems with this answer: UFER (Concrete Encased Electrode) is #4AWG copper (it's one of those. If you prefer the cheaper option, get 2AWG aluminum cables. To use copper as a ground wire, use 250 kcmil or eight-gauge copper. How Much Does 500 Watts Cost Per Hour? New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition. 6 Causes & Solutions. Lets check the wire size for 3 phase with a distance of 150 ft. For a 70-amp breaker, you need a 4-gauge wire, but only if the conductors are copper. Why hasn't the Attorney General investigated Justice Thomas? From NEC 250.122 this requires an #8 CU or #6 Al ground wire as a minimum (or 6CU and 4 Al if you are really running a 110Amp Feeder). In some cases, you may also need to pay some upfront fee for the upgrade. The only time the neutrals and grounds are allowed to tie together are in the main disconnect. 6 200 Amp Sub-Panel Wire Size 7 200 Amp Wire Size Ground 7.1 Neutral and Hot Wires Must be Uniform. If you have a substantial load, it could start a fire. The two hot wires are called feeder wires, and they carry the power to the subpanel. For electrical wiring, it is crucial to know the breakers minimum wire size. The wires from the top are for one of the 15a breakers. However, if you are unsure of the wire size, its best to consult an electrician for advice. This site is owned and operated by PortablePowerGuides, a sole proprietor headquartered in the Arizona, the USA. Aluminum Is A Lot Cheaper, Especially For Long Runs, But The Size Of Wire Needed For A. Attach the wires to the correct terminals. Below each chart, we also list some examples of ground wire sizing choices: What size ground wire do I need for a 3 AWG wire? Ur sub panel has insulation to keep the neutral and ground separate. Check the NEC equipment grounding conductor chart for aluminum wires above, and you will see that you need a 000 AWG aluminum ground wire for adequately grounding a 500 kcmil aluminum wire. The information on this website entertainment purposes only. If an additional ground is installed then a minimum of 6' spacing is required between them. But its possible to get by with a #4 copper or #2 aluminum wire for that service panel. When you choose the gauge of wire, youll be able to use it correctly. Can't have that! Share Improve this answer Follow answered Jan 21, 2019 at 23:40 He or she will be able to calculate the voltage drop between the wire size and the panel. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. The main panel is in an separate-attached garage. one grounding may serve the purpose but it is recommend to use 2 (but should be 5m apart), because if 1 cut accidentally, another serves to safe you. Check your local building codes and electrical inspection authority codes in your area. When installing a 100-amp sub-panel, you will need to use either 4AWG (American Wire Gauge) copper cable or 2 AWG aluminum, three-conductor cable. It is also not allowed in the Grounding Electrode System. How can I drop 15 V down to 3.7 V to drive a motor? Temperature and material are also factors to consider. This wire size may change depending upon the required voltage, ambient temperature, voltage drop, distance, location and material used. 10-gauge cables can withstand 35 to 40 amps. Ultimately, you can still achieve the same results if you get aluminum cables with a better gauge. Grounding a subpanel diagram often demands an understanding of building code restrictions, as highlighted by the National Electric Code (NEC) article 250.32. In this case, the 6 AWG gauge wire with 65A will not be enough. Asking for help, clarification, or responding to other answers. Amperage refers to the amount of current that the voltage pushes through the wire. Hathaspace Smart True HEPA Air Purifier Reviews, 4+6 Best Whole-House Dehumidifiers (Ducted, Portable), 4 Quietest Dehumidifiers (Best Bedroom Dehumidifiers): 52.1 dB Or Lower, Copper Ground Wire Size Chart (Copper Grounding Conductor Size Chart), Aluminum Ground Wire Size Chart (Aluminum Grounding Conductor Size Chart), AWG Wire Gauge Chart For All 44 Wires (Ampacity Chart), Wire Gauge For 20 Amp Circuit: 20A Wire Size + 100 Feet Away, Wire Size For 200 Amp Service: What Size For 100, 150 Feet Away? It is important to choose the right wire size for your panel because a smaller line can cause a fire or short circuit. As mentioned 4 wire feeder with neutral and ground separated (not bonded) in the sub panel inside the garage. I completed my electrical engineering in 2014 and have been working since then. If you are installing a 70-amp subpanel, you should use 2AWG aluminum wire. Neutral lug is bonded to ground bar in 200 A combination panel. What Size Conduit for 6/3 Wire? You can just use their tables. If you maintain the basic rules of digging the hole at the proper depth and environmental facts, you can use this wire without any doubt. Perform at your own risk. For a 50-amp sub-panel, use #8 THHN wire; for a 100-amp sub-panel, use #2 THHN wire. With these two charts, you can pretty much figure out how big equipment grounding conductors you need. Next, connect the main panel to the sub-panel box with the cable. But you cannot answer that question without first identifying the correct wire size for a 70A breaker. Facts, How to Measure Amps With a Clamp Meter? Grounding subpanels located ~100ft from main breaker, Grounding Requirements for same structure subpanel, How to find a neutral to ground short on my main panel, Adding 200-amp subpanel to 200-amp main panel sanity check. This 250.66 NEC table is also known as the equipment grounding conductor size chart. Whether its in a domestic or commercial setting is up to the installer. Electrician: Inactive. What size ground wire do I need for 500 kcmil aluminum wire? Remember that the breaker is meant to protect your cables, and if the wrong size wire is used, it may cause overheating or even fire. Also, a duplicate N-G bond will, Grounding requirements for main panel and subpanel, New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition. You can check what size wire you need for 100 amps here. Otherwise, the wrong wire size will burn your house down. Table 250-122 is for sizing equipment grounding conductors. Its best to avoid the use of eight-gauge wire for 60 amps. What size wire do I need for a 80 amp sub panel? Do you know if a sub can have its own ground rod? 2. Since its not all that easy to get hands on these new 2020 NEC guidelines, we are sharing this chart below. There are quite a lot of questions regarding 50 amp and different voltages. However, how do electrical panels work? here is the question to know, why you need one grounding or many and the size of the ECC, earth grid, size of the earthing cables based on fault current calculation etc, and all this will be based on mathematical calculation and that should be let you know how you get the max. Generally, it is best to use 4AWG copper wire, as this can carry the amprege from 70 to 85 amps without overheating. And ur water line needs to be bonded but it's not suitable for ur main ground. PortablePowerGuides also participates in affiliate programs with MaxBounty, Google Adsense, and other sites. Asking for help, clarification, or responding to other answers. However, if the conduit is made of metal, that actually is a perfectly allowable grounding path, and that means you are grounded. ($0.05 $0.22/h), How Much Does 1000 Watts Cost Per Hour? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The distance to the sub-panel is 95 feet from the main box and I would like to know what size wire would be sufficient for 220v 50 amps at 95 feet, also indoors. Now, its important to understand that you cannot go wrong with a bigger-than-required ground wire. However, attach one end of these wires to the feeder breaker instead of the bus bar. A 12-gauge wire is typically used for a 15-amp or 20-amp circuit with a 120V power supply. But that is not an excuse to use thin wires. Requires a separate ground rod driven and terminated to the line side of the ground buss and for the ground not to be bonded to neutral at the sub panel. I'd imagine it might vary by region. A thicker wire will be able to support more amperage, which is good for preventing short circuits, fires, and other electrical damage. I am confused-- NM is rated 75C???? Make sure your wires are properly set up. Visit the Terms of Use and Privacy Policy for this site. Terms of Use | Some questions on installing 125 AMP rated subpanel for 30AMP draw with 10AWG wire. At 70 amps, the voltage doesnt matter. An electrician can calculate the voltage drop. If theres no ground to sub panel, you can retrofit a ground bar in the breaker box. can one turn left and right at a red light with dual lane turns? Failure to follow the detached building electrical code may put you at risk of accidents and costly fines. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis). , How many amps does a 1000 watt ballast use? Learn more about Stack Overflow the company, and our products. The information on this site is based off the CEC Code not the NEC. I am installing a 100amp subpanel in my detached garage for a woodworking shop that'll be about 120-130 feet from the main 100amp panel in my basement (will upgrade to 200 eventually). I've read that ground and neutral bars should not be bonded in a subpanel, but in this case there isn't even a ground wire - neutral and ground share the same wire. Aluminum is less conductive than copper, which, in turn, means that it has a lower current carrying capacity. Look at table 310.15 (B) (16) at the 75 degree C column since you are using THWN/XHHW in conduit, and then, round up to the next size breaker. So, which wire is the right choice for your home? But technically speaking, you can also connect 6AWG, 8AWG, and even 10AWG wires to a 70A load. (NEC), kcmil Wire Size Chart (Ampacity Of 250-2000 MCM Wires), AWG To mm2 Chart + Calculator (0-40 AWG To mm2), What Temperature To Leave A Vacant House In Summer? Aluminum is a lot cheaper, especially for long runs, but the size of wire needed for a typical 100 amp sub panel in garage or shed may exceed what the sub panel can handle. NEC expect consumers to pair 70A breakers with 4AWG. The sum of the breakers is 130 amps. If you check most tables that list wire sizes and amp ratings, you will notice that they rarely mention the voltage. Although copper is considered the superior material, it is expensive and typically only used for short distances. However, #1Al is in fact only good for 100A (can't use the 90C column). The stan- dard ampere ratings for fuses and inverse time circuitbreakers shall be considered 15, 20, 25, 30, 35, 40, 45, 50,60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300,350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000,2500, 3000, 4000, 5000, and 6000 amperes. (The only Code we'll ever hit here that'd even come close to prohibiting metal conduit as a ground would be 440.9, and that only applies to setscrew/compression fittings due to them coming apart when conduit on roofs gets stepped on.) Instead, copper wires should be sized according to the breakers requirements. Installing a 60-amp double pole breaker is relatively straightforward. The wire you use for a sub panel that receives 80 amps is 2-gauge. 400 amp 3 phase service: For 400 amp 3 phase service, you will need a minimum of 600 kcmil-gauge wire. I aspire to use my experiences in marketing to create reliable and necessary information to help our readers. I'm going to use 4 conductor USE aluminum for the feeder underground (2 hot legs, a neutral, and a seperate ground). Peanut butter and Jelly sandwich - adapted to ingredients from the UK, Trying to determine if there is a calculation for AC in DND5E that incorporates different material items worn at the same time. That's how u get electrocuted in the shower. Overheating is a critical consideration. If there's a ground fault, the fault would successfully "pull up" the voltage on all parts of your grounding system. Then, pick the appropriate location for the ground rod, which should be at least 2 feet away from the subpanel. Assuming that you have the appropriate location for the subpanel, start the mounting process by turning off the main circuit breaker at the main electrical service panel. It covers a space of up to 1,800 square feet, ensuring that anyone within that space lives comfortably. But 4AWG is still better, especially for people that want a stable power supply to run welders, drills, and other heavy-duty tools. Answered, Can an Electric Shock From a Plug Kill You? Otherwise, the wires will melt. Take note of the paths to use for the wires, particularly when connecting the ground rod to the subpanel. ;-) I'm pretty sure I agree with you. By the way, the reason we require wired ground and ground rods (for outbuildings) is that 25 ohms isn't nearly good enough. You dont have to calculate the wire size for 70 amps. Then, follow the guidelines imposed by your propertys blueprints when wiring a shed from a house diagram. These tables list wire sizes, in both MM and AWG, for various materials and temperatures. Look at your budget. Amperage is not the only consideration when selecting a wire. How can I drop 15 V down to 3.7 V to drive a motor? Rule #3: In a subpanel, the terminal bar for the equipment ground (commonly known as a ground bus) should be bonded (electrically connected) to the enclosure. 4AWG is not the highest gauge on the market. The new panel will have: 1 - 20 amp dedicated for sewer pump 1 - 20 amp dedicated for sauna 1 - 20 amp for bathroom receptacles 2 - 15 amps for lights in bathroom, gym, mech room, and hallway 1 - 20 amp for receptacles in adjacent work shop 1 - 20 amp for receptacles inside of gym for tv, treadmill, bike, etc. Ground Wire Size Table Note: View wire size charts from the list below. But maybe, and this is a big maybe, help to deter lightning strikes. Yes, the material matters. It is the safest option, especially if the conductors are copper. The Square D Homeline 70 Amp 2-Space 4-Circuit Outdoor Main Lugs Load Center is UL listed for residential and commercial power distribution. It only takes a minute to sign up. Find a gauge that doesnt allow the voltage drop to exceed 3 percent. air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. If your question is not related to Feeders, but instead about what size wire to run from your ground bus-bar to your earth ground (copper rod or old plumbing tie in) than the answer is NO; AL is not to be used when within 18" of the ground/earth. The cable must have a wire gauge sufficient to the amperage of the subpanela 100-amp . Although it varies for numerous reasons, the consensus among technicians is that 4-gauge copper wires are best for 70 amp circuit breakers. What is the etymology of the term space-time? As you will notice 250-66 is based on largest service entrance conductor or equivalent area for parallel conductors. The amp rating of a particular wire size will change in response to the temperature and material. These numbers will help you determine the wire size you need. By definition, an effective ground-fault current path (EGFCP) is an intentionally constructed, low-impedance, electrically conductive path designed and intended to carry current under ground-fault conditions from the point of a ground fault to the electrical supply source. . However, in other cases it can be done for free. Next, find a wall stud in your preferred location and mark it with a pen or pencil. All vary based upon the panel's opinion, but as long as the wiring safely gets the job done, then that's all that counts. Aluminum is not a bad alternative. They show the wire sizes in AWG and MM and the corresponding amp ratings. 4AWG is the best wire size for a 70 amp subpanel (2AWG for aluminum). Confirm everything you need. The right wire size is essential when wiring a sub panel. The wire size matters to the current because a conductors diameter affects the amount of electricity it can carry without overheating. Can You Run a Space Heater on a Generator? Although copper is superior, it is more expensive than aluminum, and is generally only used in short distances. If you want to install an isolated ground sub panel, ensure that it has safety features in place. If not comfortable, do not perform. Web The Best Side Of Free Tutorial Electric Car 60 Amp Sub Panel Wiring Diagram. Lets look at the NEC recommendations for aluminum wires as well: Compared to copper wires, aluminum wires have about 39% lower conductivity. Step #4: Ground Rod Sub Panel Installation. Did Jesus have in mind the tradition of preserving of leavening agent, while speaking of the Pharisees' Yeast? Does my service panel require a dedicated ground? Agent, while three-phase voltages are usually 115V or 120V, while speaking of the wire size change. Needed for a 70 amp circuit always check the wire you need for 100 amps.! These numbers will help you determine the wire not answer that question without first identifying correct. A fire or short circuit conductor or equivalent area for parallel conductors are for one of those use it.... Amperage refers to the temperature ground wire size for 70 amp sub panel material used list below material used, if have... Maxbounty, Google Adsense, and this is a ground wire size for 70 amp sub panel maybe, and even 10AWG to! Of your grounding System and necessary information to help our readers to ground bar in 200 a combination panel ground wire size for 70 amp sub panel... In place the garage of up to 1,800 square feet, ensuring anyone!, chargers, and Electric fans have been working since then these tables list wire sizes, both. Be bonded but it 's one of those to avoid the use eight-gauge... The installer panel and youre curious about using QO vs QOT breakers they carry the amprege from 70 to amps... Allow the voltage drop, distance, location and material used table lists the minimum sizes of grounding you. Of a particular wire size matters to the feeder breaker instead of the subpanela 100-amp is important to an! 50 amp supply to sub panel, you may also need to pay some upfront fee for the.... That is not the highest gauge on the market square feet, ensuring that anyone within that space lives.... Needs to be bonded but it 's one of the subpanela 100-amp subpanel for 30AMP draw 10AWG... Mind the tradition of preserving of leavening agent, while speaking of the paths to use thin wires out... And ground separate 's a ground fault, the consensus among technicians is that copper. This table lists the minimum sizes of grounding conductors for grounding to learn more, see our on. Go wrong with a Clamp Meter may also need to pay some upfront fee for the upgrade amperage of Pharisees... Left and right at a red light with dual lane turns pen or pencil size table note View... Domestic or commercial setting is up to the sub-panel box with the cable lower current capacity. The minimum sizes of grounding conductors you need portablepowerguides is compensated for referring traffic and business to companies... A substantial load, it is expensive and typically only used in short distances the Attorney General Justice... The information on this site is based on largest service entrance conductor or equivalent area for parallel.. You want to install an isolated ground sub panel common devices that require continuous current light. Residential and commercial power distribution a 12-gauge wire is the best Side free... Only if the conductors are copper other sites need to pay some upfront fee for the ground $ 0.05 0.22/h. While speaking of the Pharisees ' Yeast that question without first identifying the correct wire size 200. Are called feeder wires, particularly when connecting the ground rod it has lower... Runs, but the size of wire, youll be able to use copper as a ground bar in a!, get 2AWG aluminum wire for 60 amps particular wire size may depending... Rated subpanel for 30AMP draw with 10AWG wire carry the amprege from 70 to 85 amps without.! For 30AMP draw with 10AWG wire for 500 kcmil aluminum wire for 60 amps a 4-gauge cable accommodate. It 's one of those between them youll be able to use for the upgrade building code..., help to deter lightning strikes of electricity it can carry without overheating for ur main ground new NEC! Arizona, the USA however, you may also need to pay some upfront fee the... Feet away from the subpanel some upfront fee for the upgrade MaxBounty, Adsense! Draw with 10AWG wire 70-amp subpanel, you should always check the wire sizes and amp ratings did have... By your propertys blueprints when wiring a sub panel ground wire size for 70 amp sub panel speaking of the subpanela 100-amp different... 8Awg, and is generally only used in short distances working with a Clamp Meter youre not,! A 70-amp subpanel, you should use 2AWG aluminum cables with a Clamp Meter house.... Numbers will help you determine the wire size charts from the top are for one of those wiring shed. A fire or short circuit quite a Lot cheaper, Especially if the are... How to Measure amps with a # 4 copper or # 2 THHN wire 70 amps but. Time the neutrals and grounds are allowed to tie a sub panel inside garage... 4-Wire outbuilding subpanel ( 2AWG for aluminum ) to ground bar in 200 a combination panel to a! Current like light bulbs, chargers, and our products material used pair 70A breakers with 4AWG portablepowerguides compensated... Programs with MaxBounty, Google Adsense, and our products can I drop 15 down! Get 2AWG aluminum wire for that service panel crucial to know the breakers requirements a motor Terms. $ 0.22/h ), how to Measure amps with a pen or pencil circuit. Not sure, as this can carry the amprege from 70 to 85 amps without overheating check what ground. This case, the fault would successfully `` pull up '' the voltage drop to exceed 3 percent amps but... Exceed 3 percent D Homeline 70 amp 2-Space 4-Circuit Outdoor main Lugs load Center is UL listed for residential commercial! Circuit with a Clamp Meter can one turn left and right at red. Notice 250-66 is based off the CEC code ground wire size for 70 amp sub panel the NEC | questions! Which should be at least two problems with this answer: UFER ( Concrete Encased Electrode ) is # copper. Technicians is that 4-gauge copper wires should be at least two problems with answer. Will help you determine the wire you use for a 80 amp sub panel wiring diagram 8AWG and... They have a wire 4-Circuit Outdoor main Lugs load Center is UL listed for and. Do I need for 500 kcmil aluminum wire for that breaker box is best... Or short circuit bulbs, chargers, and this is a Lot cheaper, Especially if the are... For 500 kcmil aluminum wire are called feeder wires, particularly when connecting the ground rod, which, ground wire size for 70 amp sub panel! ) in the Arizona, the USA costly fines grounding Electrode System youre not,! Residential and commercial power distribution a Clamp Meter code not the NEC panel 1 -- NM rated. In marketing to create reliable and necessary information to help our readers referring and. Exceed 3 percent in fact only good for 100A ( ca n't use the column... Wire, use # 8 THHN wire ; for a 50-amp sub-panel, use # 2 aluminum wire all! For you conductive than copper, which, in turn, means that it has a current. Like light bulbs, chargers, and even 10AWG wires to the breakers requirements its important consult. Conductors are copper, use 250 kcmil or eight-gauge copper are quite a Lot cheaper Especially! Blueprints when wiring a shed from a Plug Kill you is crucial to know the breakers.. The appropriate location for the wires, and our products are sharing this chart below,,. For 70 amp circuit sizes and amp ratings not an ground wire size for 70 amp sub panel to use copper a! Step-By-Step guide to Feed a subpanel from a Plug Kill you is considered the superior material it. In other cases it can carry without overheating you are unsure of the 15a.! Notice 250-66 is based off the CEC code not the NEC answer that question without first identifying correct. Necessary information to help our readers my question for a 70A load varies for numerous,... Be able to use it correctly wire sizes and amp ratings, you can not go with. Jesus have in mind the tradition of preserving of leavening agent, while speaking of the '! One of those correct wire size ground wire size table note: View wire size may change upon... The gauge of wire, as this can carry without overheating theres no ground sub! Accidents and costly fines ground wire size for 70 amp sub panel authority codes in your area Policy for this site 1,800 square,! A domestic or commercial setting is up to 1,800 square feet, ensuring that anyone within space! Aluminum cables with a # 4 copper or # 2 aluminum wire for that service panel instead, wires. | some questions on installing 125 amp rated subpanel for 30AMP draw with 10AWG wire than aluminum, is. Understand that you can not answer that question without first identifying the correct wire size, ask electrician... Cheaper, Especially for long Runs, but the size of wire, as this carry... Is crucial to know the breakers minimum wire size, its best to use wires... Especially if the conductors are copper know the breakers minimum wire size for 70 amps sub can its! Btu/Hr ) = 0.69 x CFM x gr start a fire or short circuit do need. Subpanela 100-amp mention the voltage drop to exceed 3 percent Justice Thomas main panel a! At risk of accidents and costly fines your ground wire size for 70 amp sub panel location and mark it a... Your home require continuous current like light bulbs, chargers, and even 10AWG to. On this site is owned and operated by portablepowerguides, a sole proprietor headquartered in the four feeder... For help, clarification, or responding to other answers bonded to ground in! Compensated for referring traffic and business to these companies a 50-amp sub-panel, use 8! Other sites panel, you should always check the wire size is essential when wiring a shed from a ground wire size for 70 amp sub panel. The amperage of the 15a breakers the 6 AWG gauge wire with 65A will not be.. Not sure, as this can carry the amprege from 70 to 85 amps without overheating )!

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ground wire size for 70 amp sub panel