5000. 700. 1200. 6000. 800. 1200. Note: View wire size charts from the list below. Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (30°C) Maximum Allowable Ampacities for Conductors in Free Air (30°C) Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (40°C) Maximum Allowable Ampacities for ...Grounding and bonding 320/400 amp residential. AHJ stopped by today to inspect my trench. Asked him about bonding the main panel and disconnect as I don't do a lot of 400 amp services. He said I could bond the two ground rods to the meter and then bond the panels to the water and then the meter and panels would be bonded via the neutral.That said, a 400-amp service will give you a lot more flexibility. You can have two good sized 200 amp panels in different parts of the house, Each panel will hold around 40 breakers. This allows more runs, and shorter runs from the panels to the outlets and other devices. Shorter runs mean less voltage drop that means less heat generated …Anyways, we decided to put up a 400 amp service because we know how this customer works. The question came up when it came to bonding the gas and water lines. Because of our service feeder sizing 3/0 in 2 parallels. I was questioned on the sizing of my water and gas bond because I ran 1/0 copper ground to the lines.Trench and install FPL provided PVC as follows: a. Trench along FPL designated route. b. Trench must be between 26" and 36" in depth with 24" minimum cover over PVC. c. Use PVC cement on all joints. d. For all turns along trench route, only two 90 degree bends are allowed, use 36" radius 90 degree "long" bends.Three hinges are required for doors from 36" through 72" high. Four hinges are required for doors over 72" high. Hinge pins must be stainless steel and 5/16" diameter minimum. Switch compartments must have a window built with safety glass or equivalent for easy viewing of switch status by a person of normal height.CUSTOMER INSTALLATIONSTANDARDS FOR ELECTRIC SERVICE September 4, 2018 A transition period will exist in which installations may be approved and connected as long as they meet either the 20 13 or the 2018 editions. Beginning January 2, 2019, only the 20 18 edition of the Customer Installation Standards will be accepted.Location. New York. Jan 26, 2006. #1. We are planning to install a 400 amp single phase switch feeding 2-200A panel boards in the same room (approx. 300 sq. ft. in size) to accommodate HVAC equipment. The current service is 200 amps single phase for this Historic Structure built in the 1780's. Currently, we have headroom of 6'2" in the room.#1 · Mar 31, 2022. What to do on a 400 amp service with two 200 amp disconnects next to it on a pedestal located outside of home. Will be running two runs of 4/0 to panels inside …the service disconnecting means shall be installed in bathrooms. tvo 3/0 avg black conductors to main breaker vhite or marked vhite conductor td neutral bus 1/0 bare copper to grounding bus bonding jumper or bonding screv panel on riser rigid or strap 3 inch te metal conduit 400 amp meter base should be 5 ft. to 5-1/2 ft. above ground level tometering for 400 amp services or less. Some areas do require the use of CT (current transformer) metering for a 400 amp service. This type of meter base uses a transformer in the panel to step down the power before it flows through the meter. Your local Grover’s sales team can advise you if this is the case in your area.New member here. I need some guidance on setting up a new service. I have a 400 amp service from the utility to the meter base which will then feed (2) 200 amp disconnects. The utility requires the ground to be bonded in the meter. I have a #4 bare copper connected to 2 ground rods that will route into the meter base.Two feeds. 1 500kcmil Cu parallel for 800 amp (two 400 amp slit 200's) at main house, 2/0 Cu single for "barn" 200 amp ATS. All ATS are service rated and double as disconnects (installed 15 different times on a smaller scale). ... The size of the grounding electrode conductor at the service, at each building or structure where supplied by ...Sep 18, 2023 · The ground wire in a 100 amp service is designed to provide a safe path for electrical current to flow in the event of a fault or short circuit. How do I determine the proper size of ground wire for a 100 amp service? The size of the ground wire for a 100 amp service depends on the type of wiring used and the distance between the electrical ...A 200-amp panel using three 2/0 AWG, it is recommended to use a 2- or 2.5-inch conduit for easier pulling. #2. Voltage Drop And Why Length Matters. Voltage drop can be easily explained as the voltage is less at the end of a run than it is at the start. As wires get longer, the resistance increases causing the voltage to drop.Add the amperages of all the individual breakers in the box. The total might be more than twice the total amperage of the box. For example, a 100-amp service panel could have circuit breakers that add up to more than 200 amps. This is normal. The Biggest Mistakes DIYers Make—and How to Avoid Them.Three hinges are required for doors from 36" through 72" high. Four hinges are required for doors over 72" high. Hinge pins must be stainless steel and 5/16" diameter minimum. Switch compartments must have a window built with safety glass or equivalent for easy viewing of switch status by a person of normal height.Take a walk with filmmaker Jeremy Ullmann and experience the welcoming people and extraordinary landscapes of Kyrgyzstan. Take a walk with filmmaker Jeremy Ullmann and experience t...dwe11ing units of two-family and multifamily dwellings, service and feeder conductors supplied by a single-phase, 120/240-volt system shall be permitted be sized in accordance. with 31 0.15 (B) (7) (l) through (4). (l) For a service rated 100 through 400 A, the service. conductors supplying the entire load associated with a.A 400 amp service is a type of service that provides a higher level of electrical protection than a standard service. 400 amp services are typically used in industrial and commercial settings where high-powered equipment is located. These services can also be used to provide additional electrical protection for large facilities that may have ...Working out a concept for a manufactured product but not sure how to build it? QoQer is helping manufacturing startups get off the ground. Working out a concept for a manufactured ...what cable do I need for a 400 amp service 650 ft run and what transformer. On 2020-08-26 y Mike Lange . I am looking for underground wire size needed to run 1200 feet .. I would like a 30 amp 240 volt service . On 2020-08-20 by frank . what size underground wire do I use for 200 amp service for generator that is 200 ft away from the service meter?We are talking about service entrance conductors. The 400 amp meter pan has tandem lugs, agreed. Once you attach more than one set of conductors on those lugs you are now in parallel. Those conductors MUST be connected in parallel in a trough and then the 2 200 amp panels are tapped off those conductors. Period.Without the 83% rule for dwellings, this would be 335A. For dwellings, it would be 400 (because we cant seem to go above 400 otherwise it would be 404). Because you have two service enclosures, see 250.64 (D) - depending on what method you use, there may be taps that can be smaller than the main GEC.New member here. I need some guidance on setting up a new service. I have a 400 amp service from the utility to the meter base which will then feed (2) 200 amp disconnects. The utility requires the ground to be bonded in the meter. I have a #4 bare copper connected to 2 ground rods that will route into the meter base.Need a 400 amp meter base and must run ground wires (400amp, #2 cu) from each panel to water main or 1 400 amp ground wire from meter base to water main, also a ground from meter base to ground rod, think that can still be a #6, don't have my book handy, someone else knows, I'm sure. My region now requires 2 ground rods, 6 feet apart.Oct 21, 2007 · New Home 400 amp service [ 3 Answers ] I brought in 400 amp to my outside meter for my new log home. I had planned to split off 200 to the house and 200 to a future shop. However I don't think 200 will be enough from time to time. One expert I asked said I would be running at 600 AMP requirement. I think he is nuts.Microsoft's reimagined Teams promises double the performance, reduced memory usage and improved user experience. Teams, Microsoft’s Slack rival, has always had a bit of a reputatio...The term 400 amp service means the capacity of your home electric service. The capacity is actually measured by the amp. This also means that the current flows through the wire. So, in simple terms, the whole 400 amperage current flows through the wire and its maintenance is the 400 amp service. Making an upgrade on your …A 200 amp electrical panel upgrade costs about $1,630 to $4,070, with a National average cost of $2,730. Updating the home's electrical system could cost anywhere from $8,000 to $15,000. Electrical panels can last 25 to 40 years. Age is not always a primary concern when an electrical panel replacement is necessary.October 9, 2023 by GEGCalculators. The size of the ground wire for an electrical circuit depends on the circuit’s amperage rating. Common ground wire sizes for copper conductors include 10 AWG for 20-50A circuits, 8 AWG for 60-100A circuits, and 6-4 AWG for larger circuits. Always follow local electrical codes and consult a professional for ...Exception No. 1: A receptacle installed in accordance with 430.81 (B). Exception No. 2: A receptacle installed exclusively for the use of a cord-and-plug-connected arc welder shall be permitted to have an ampere rating not less than the minimum branch-circuit conductor ampacity determined by 630.11 (A) for arc welders.rgsgww Discussion starter. 1543 posts · Joined 2008. #1 · Apr 19, 2009 (Edited) I currently have a 400 amp service with two 200 amp service panels, the ground is a water pipe connected with what looks like 4 awg stranded. There is one rod with 6 awg solid. If I were to update the grounding system, wouldn't I need to sink rods for each panel?We are talking about service entrance conductors. The 400 amp meter pan has tandem lugs, agreed. Once you attach more than one set of conductors on those lugs you are now in parallel. Those conductors MUST be connected in parallel in a trough and then the 2 200 amp panels are tapped off those conductors. Period.what cable do I need for a 400 amp service 650 ft run and what transformer. On 2020-08-26 y Mike Lange . I am looking for underground wire size needed to run 1200 feet .. I would like a 30 amp 240 volt service . On 2020-08-20 by frank . what size underground wire do I use for 200 amp service for generator that is 200 ft away from the service meter?The ground wire, often referred to as the grounding electrode conductor, is the link between the ground rod and the service ground connection. Ground wires for residences typically are made of copper and are #6 (6 AWG) or larger. For 200 Amp services, a #4 grounding electrode conductor (ground wire) is required.what cable do I need for a 400 amp service 650 ft run and what transformer. On 2020-08-26 y Mike Lange . I am looking for underground wire size needed to run 1200 feet .. I would like a 30 amp 240 volt service . On 2020-08-20 by frank . what size underground wire do I use for 200 amp service for generator that is 200 ft away from the service meter?At the meter the feeders emerge in PVC out of the ground 4ft and at the house they extend into the basement in PVC 10ft. ... I generally find the simplest and least expensive way to do a 400 amp service is to use 230.40 Ex 2 and bring two 200 amp sets from the meter to two 200A main breaker panels.Wiring 100a electrical disconnect installing 400 amp service ground wire size Mozella mast. What Size Ground Is Needed For A 400 Amp Service - NRITDE. Nec residential service wire size 400 amp service ground wire size Going to 400 amp service. need advice on entrance cable. 400 amp service ground wire sizeWithout the 83% rule for dwellings, this would be 335A. For dwellings, it would be 400 (because we cant seem to go above 400 otherwise it would be 404). Because you have two service enclosures, see 250.64 (D) - depending on what method you use, there may be taps that can be smaller than the main GEC.Amp 400 panel meter installed Meter amp 200 base 400 service replacing electrical subpanel Meter base amp 200 wiring diagram installation disconnect 200a …Single Family Residential Electrical Services | NFPASeems counterintuitive to reference a table dealing with bonding a raceway vs a system ground. unless you guys have a local rule it's 6 for your system ground. doesn't matter if it's a 100 amp single phase or 1200 amp 3 phase service. it USED to be different (i think 2 code books ago) Ontario, Canada 10-114 CEC states minimum #6AWG Copper but ...Sep 29, 2004 · Sep 30, 2004. #7. Re: 400 amp service Since each of these panels is service equipment, each has a "grounded service conductor" and also has the grounded/grounding bus bonded to the service enclosure. Per 250.53 (D) (2), you can bond at any of these locations: "The supplemental electrode shall be permitted to be bonded to the grounding electrode ...May 3, 2022 · For 200-amp sub-panel In the case of underground service, a minimum of 1.5 inches of schedule 40 or 80 PVC conduit is required for copper wire or #4/0 AWG for aluminum and copper-clad wire. You will also require a 250 kcmil-gauge copper wire. Be sure to have the proper wire size of 200 amp.Mar 30, 2023 · A 400 Amp service panel and 400 Amp meter base require a 750 kmil (750 MCM) 0r 1000 kcmil (1000 MCM) aluminum wire at 194°F or only 1000 kcmil (1000 MCM) at 167 °F. For copper wire, you will need 600 kcmil (600 MCM) copper wire for both 167 °F and 194°F. For a 140 °F underground service, 1250 kcmil aluminum and 750 kcmil copper cables are ...The right wire size for an 80 amp breaker is a 2 or 3-gauge wire. It is thick enough to carry the current produced by the 80 amps service. The 4 gauge wire is sometimes also considered the standard size for 80 amps. If you use aluminum wires, the size would be 1 or 2-gauge wire. The wire size can vary based on factors like the wire …Using 4/0 AL to (2) 200 Amp Main Breaker panels 2 seperate 2" pvc pipes, 2 seperate feeds, (no parallel feeds, no tapping.) # ? GEC from meter can to grounding electrodes I'm looking at Table 250.66 and according to the chart a #4 solid copper is acceptable for the 4/0 AL Service Entrance Conductor. But, now the Fine Note #1 below the chart is ...I'm finishing up installation of a main, 400 Amp Meter service that has two 200 Amp panel disconnects (one on each side of the meter). I've installed the service wire from the weather-head down to the …Choosing a service that accommodates potential expansions ensures longevity and avoids the need for frequent upgrades. Cost Implications. Budget considerations play a significant role. While 200 amp service is cost-effective initially, the long-term benefits of a 400 amp service may outweigh the initial expenses.The ground wire, often referred to as the grounding electrode conductor, is the link between the ground rod and the service ground connection. Ground wires for residences typically are made of copper and are #6 (6 AWG) or larger. For 200 Amp services, a #4 grounding electrode conductor (ground wire) is required.OzEng, Thanks for the information.The soil is red clay with plenty of iron in it so there shouldn't be a problem there.The local building code chart guide only goes to 200 amp.It doesn't specify ground rod size just a depth of at least 4' in the ground and using #4 copper for the ground wire.The circuit length to the rod and back is 20'.The typical ground rod size that is sold locally for a ...But in retrospect when there was individual standalone service switches for example a 400 amp service switch that was part of a 1000kva installation the advisory board required 5 Ft. clearance in front of it. ... Should the grounding conductor in a 4000A service switchboard (where 4-1/4"x6" copper is being used to meet 230.42) be based on the ...Generally, the ground wire size for a 200 amp service ranges from 2 AWG to 8 AWG. The best one is 2 AWG for copper wire and 4 AWG for aluminum or copper-clad aluminum wire. It is recommended to use them with 1.5-2.5 inches schedule 40 or 80 PVC conduit for underground service. It may differ depending on the materials, permission …While there are many factors that go into making sure that the ground rod is properly sized, the size of the rod itself is the most important factor. By understanding what size ground rod is needed for a 400 amp service, you can ensure that your home is safe and sound. Service Entrance 100amp To 200 Code Questions.I have a 400 amp underground service to do for residential home. I'm curious what others run for underground service conductors. I thought I could use 310.12(A) for the service conductors. ... Platt-Clay requires a conduit stubbed down 18 inches into the ground, and they provide direct burial cable. I've only done one service in their area ...To calculate the total watts for a 400 amp service, we can use the following formula: Total watts = Total amperage x Voltage. Assuming a standard voltage of 120 volts, the total watts for a 400 amp service would be: Total watts = 400 amps x 120 volts = 48,000 watts. However, this calculation does not consider the electrical demand of individual ...Installing an in-ground basketball goal takes no time compared to the countless hours of use that goal will get. Expert Advice On Improving Your Home Videos Latest View All Guides ...I am an electrical contractor and will be doing a new install of a 320/400 Amp service. I have never done a 320 service before, only standard 200 and 100, etc. This is for a friend of mine, so it's basically a side job. Below is what I figured for the job and wanted to run it by some of you with experience with this type of setup.What is the minimum size of the copper grounding electrode conductor permitted to run to an 8 foot ground rod, to a 400 amp service installed with 500 kcmil copper? ... Table 250.66 Grounding Electrode Conductor for Alternating-Current Systems A feeder circuit for a 400 amp sub panel is installed in a nonmetallic raceway using 3/0 copper ...Oct 2, 2023 · The ground wire, often referred to as the grounding electrode conductor, is the link between the ground rod and the service ground connection. Ground wires for residences typically are made of copper and are #6 (6 AWG) or larger. For 200 Amp services, a #4 grounding electrode conductor (ground wire) is required.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 ...For a 400 amp service, the minimum wire size required is 3/0 AWG copper or 2/0 AWG aluminum. These wire sizes have an ampacity of 400 amps. Voltage drop. Voltage drop is the amount of voltage that is lost as electricity travels through a wire. The longer the wire, the greater the voltage drop.A 100 amp service will need a minimum of 1.25 inches, schedule 40 or 80 PVC grey electric conduit. You can use a larger conduit to maintain the inner fill of 40% or less. A 1.5 or 2-inch conduit is best if running three or more electrical wires within the same electric conduit. Chapter 9, Table 5A of the 2020 NEC, #2 Aluminum-stranded insulated ...200-amp Service Wire Costs: Between $1000 and $1500 on average, with a median of $1250. The average cost of a 200 amp service panel: Between $500 and $4000, with a typical cost of $2000. The average cost of a 200 amp meter base: Between $100 and $650, with a typical cost of $450.We are looking at replacing an existing 4000A service entrance switchboard and feeders and am trying to determine the best approach to sizing grounded conductor (neutral). I'm not sure if the existing facility has any 277 L-N loads which leaves me debating weather nor not I need to pull a full size neutral or just size the neutral per requirements …I have a 400 amp heavy up going on and I have a few questions about grounding... I have 2 outdoor main disconnect switches and it has been a few years since... Menu. Home. ... 400 amp service. Thread starter eddie722; Start date Oct 6, 2010; Status Not open for further replies. E. eddie722The right wire size for an 80 amp breaker is a 2 or 3-gauge wire. It is thick enough to carry the current produced by the 80 amps service. The 4 gauge wire is sometimes also considered the standard size for 80 amps. If you use aluminum wires, the size would be 1 or 2-gauge wire. The wire size can vary based on factors like the wire …Mar 13, 2013 · OK, so see if this follows. Table 310.15(B)(7) Allows me to use 400kcmil USE copper for a 400 amp underground residential service which in table 310.15(B)(16) would have an amperage rating of 335 amps. Now using the amperage rating of 2/0 USE, which is 175 amps, and running it in parallel would give a total ampacity of 350 amps.Apr 7, 2022 · While there are many factors that go into making sure that the ground rod is properly sized, the size of the rod itself is the most important factor. By understanding what size ground rod is needed for a 400 amp service, you can ensure that your home is safe and sound. Service Entrance 100amp To 200 Code Questions.If you have a 320 (400) amp meter base with 2 - 200 amp panels, one on each side usually, then a #2 copper is all you need, however if you are using a meter main panel then 1/0 copper is needed based on the notes to 250.66. Based on power company wire which is 350 kcm then a 1/0 is called for in 250.66 that is 1/0 aluminum. Hambone8780.Table 250.102 (C) (1) lists the minimum sizes for grounded conductors, main bonding jumpers, system bonding jumpers, and supply-side bonding jumpers for AC systems. Steps to size the system grounded conductor: 1. Find the size and material of the service-entrance ungrounded conductor (s). 2.Bring the 1-0 oversized wire for the 400 amp service into one 200 amp panel. Take the ground wire and bring it to the other panel. If you hesitate to connect the panels, hire a professional to wire the sub-panels. ... Service line price (Underground 400 amp 240V service line) $20 to $40 per linear foot:2) At your main electrical panel you could install a couple of feet of 6 AWG stranded copper or 4 AWG stranded AL for the 50 amp breaker. Either of wire sizes are rated for a 50 amp feeder breaker. At the main panel, use either of this size. If using the 4 AWG Aluminum, make sure the 50 amp breaker is rated for AL wiring.Conductor Sizing and the National Electrical Codewhat cable do I need for a 400 amp service 650 ft run and what transformer. On 2020-08-26 y Mike Lange . I am looking for underground wire size needed to run 1200 feet .. I would like a 30 amp 240 volt service . On 2020-08-20 by frank . what size underground wire do I use for 200 amp service for generator that is 200 ft away from the service meter?For 200-amp sub-panel In the case of underground service, a minimum of 1.5 inches of schedule 40 or 80 PVC conduit is required for copper wire or #4/0 AWG for aluminum and copper-clad wire. You will also require a 250 kcmil-gauge copper wire. Be sure to have the proper wire size of 200 amp.Jul 19, 2022. #8. Since I have to make a decision to upgrade our panel - the cost to go to 200 Amp vs. 400 Amp was almost the same - $1,500 difference - so $9.6K vs $11K. With all of the things in this world moving to eclectic, it just seemed to make sense to do the 400 amp now as I NEVER want to deal with this again.ABOVE GROUND, THROUGHFARES, DRIVEWAYS, ECT. 2 400.3 MAXIMUM SERVICE ENTRANCE CONDUCTOR SIZE IN RISERS (OVERHEAD) Service entrance conductors installed by the customer shall be sized per NEC requirements. Maximum size conductor shall be 750 MCM with a maximum number of two conductors per phase. If service riser conductors are to be paralleled ...Most areas will not allow a 320 amp meter base for a 400 amp commercial service. Also, you will not be able to downsize the service conductors as in residential. If you parallel the service conductors, the minimum size is 3/0 copper or 250 aluminum for a 400 amp commercial service.Removing existing 400 amp meter base and replacing with CT cabinet with meter installed on right side if CT cabinet. Planning on installing a trough above cabinet extending over the left side. Coming out of cabinet to a 600 amp service rated ATS and then over to a 600 amp exterior MDP to feed the 3- 200 amp panels.400 A 3" 400 MCM 600 MCM #2 ½" 600 A 4" 1000 MCM 2/0 1" ... Ground wire installed in metal conduit, must be bonded at both ends to grounding conductor. Service may be grounded at panel or meter base but not both. Install ground rod and attach ground wire to rod with a one-bolt ground rod clamp (water pipe clamps not ...So, a 250 kcmil wire is ideal for 200 amp. The size depends on how far you run the wires from the sub-panels to the main panels. The wire has to be at least 2 AWG thick. However, it also depends on the cable length. If you run a wire 200 feet away from the main electrical panel, use a minimum of 1-gauge copper wire.I am an electrical contractor and will be doing a new install of a 320/400 Amp service. I have never done a 320 service before, only standard 200 and 100, etc. This is for a friend of mine, so it's basically a side job. Below is what I figured for the job and wanted to run it by some of you with experience with this type of setup.Above the 800 amp breaker, the ratings hold at the 380 rating. Definitely use a neutral that matches the current carrying wires, 500 mcm in this case. I believe this is a service entrance, table 250.66 in NEC shows a 1/0 copper ground for your application assuming you are using a 400 amp breaker and 500 MCM to feed downstream.Re: 400 amp service Just completed a 600 amp service with 3 200 disc and 1 225 dis grouped. Used the green bonding screw in each panel, installed a bond of #4 cu from the ct can to one of the disc,a #4 from the first disc connected in lay lugs at eaqch of the others and then oout to the ground rods. Meets all requirements and passed very nicelyservice lateral to a single family dwelling in a subdivision where the electric distribution facilities are underground. A. Services 1. Material The service cable assembly shall consist of aluminum or copper phase conductors, insulated with .080 inches black cross-linked polyethylene and a neutral conductor,Labor costs also contribute and can vary from one region to another. A quick comparison of the costs involved can often bring insight to the decision. 400 Amp Service Panel. 200 Amp Main Disconnect with Sub-panel. Two 200 Amp Main Disconnects. Service Panel Costs. $1,300. $300. $450.10 Connect the monitor power cable in the main panel. If your monitor is already installed, skip to step 11. In the panel where you placed your Sense monitor, find the monitor power cable connected to the top port of the Sense monitor. Connect the black wire and the red wire to an empty 240V breaker and the white wire to the neutral bus bar.. Copper, aluminum and copper-clad aluminum equiThis panel is sufficient for very large homes and resi How Much Does A 800-Amp Service Cost? If you want to install two 400A services, each 400A service could cost you as much as $4,000. On the other hand, you may spend an estimated $750 to $2,000 on each 200A service. 800-Amp Service Installation Cost. You may spend $10,000 or more depending on the kind of setup you have in mind.Re: Parallel Equipment grounding conductor size If this is a 150V-600V wye connected system, then 240.13 applies(it will have ground fault protection). If the ground fault is set to meet 250.122(F)(2) along with meeting the other conditions, then you can use 3/0 egc in each pipe. But why would use use 10 - 3/0 in the first place? A. AMPED Discussion starter. 110 posts · Joined 2 However, there are wildly different theories and requirements on what size UFER ground is required. We have local jurisdictions require 1/0 for a 400A service while others require #2. We have seen plans from engineers specify 3/0 for a 1200A service and a few specify 500MCM for a 2000A service. A minimum of 4-gauge wire and 1 1/4-inch conduit is ...
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