2024 Wire size for 200 amp service copper

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I’m planning on upgrading my electrical service to 200 amps but I’m not sure what aluminum wire size I need. I get confused with the ambient temperature chart, I’m located around Houston Texas area. ... The 200 amp service can be derated to .83 so that's 166 amps. At 75 degrees C, 3/0 Al is 155 amps and 4/0 Al is good for 180 amps so …Jump To The Right Section: What Size Wire For 200 Amp Service? What size wire for 200 amp service 100 feet away? What Size Wire For 200 Amp Service …Application. Southwire® Type SE, Style SEU service entrance cable is primarily used to convey power from the service drop to the meter base and from the meter base to the distribution panelboard; however, the cable may be used in all applications where Type SE cable is permitted. SER may be used in wet or dry locations at temperatures not to ...size; awg or kcmil types tw, uf types rhw, thw, thwn types tbs, sa, sis types tw, …Choosing the right wire for 200 amp service is a matter of safety. The wire that you use for 200 amp service depends on the material, and you’ll need #4/0 wire if it is aluminum. Whether it be copper, copper-clad, or aluminum, let’s take a look at what size wire you need for 200 amp service.310.15 Ampacities for Conductors Rated 0–2000 Volts. (B) Tables. (7) 120/240-Volt, Single-Phase Dwelling Services and Feeders. For one-family dwellings and the individual dwelling 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 …Why are people putting 3/0 cu on a 200 amp single phase 3 wire service. They keep quoting 310.15 using 90 degree rating for copper as being 200 amp. I am questioning if they even understand what happens inside an electrical panel. Let me explain. Each ungrounded conductor of the service carries 100 amp a piece of the 200 …In the world of DIY projects, having the right tools and materials is essential. When it comes to electrical wiring, one important factor to consider is the gauge size of copper wi...Each has a different ampacity for a specified gauge size, and these ampacities are found in NEC® Table 310.15(B)(16) for the calculations in this app. For example, 3/0 AWG copper has an ampacity of 200 amps at 75℃, while 3/0 AWG aluminum has an ampacity of 155 amps at 75℃. WIRE / CABLE TYPE:The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30°C (86°F).Advertisement Connectors are critical to today's cars. Without them, it would be nearly impossible to build or service a car. Whenever a bundle of wires passes through or attaches ...4-gauge wire. 70 amps. 3-gauge wire. 85 amps. 2-gauge wire. 95 amps. These ratings are for standard copper NM sheathed cable, but there are instances where these amperage ratings vary. For example, there is aluminum wiring in some homes, and aluminum wires have their own ampacity-carrying capacity.We generally use these thick wires when we need more than 200 amp service. Which kcmil wire exactly we need for carrying high currents is determined by the kcmil wire size chart (check the chart further on). Example: What is the ampacity of 400 kcmil copper wire? If you check the kcmil ampacity chart below, you can see that 400 kcmil copper ...While looking for the ground wire for 100 amp service, it can be as thin as 10 AWG or as thick as 2/0 AWG. The minimum ground wire size for 100 amp service is 8 AWG copper or 6 AWG aluminum wire. It can change based on several factors. You will need to consider a few things before you decide on the exact ground wire size.The National Electrical Code requires a minimum of 2/0 AWG for copper wire and 4/0 aluminum wire or copper-clad wire when installing a 200-amp panel. However, a licensed electrician should be the one to size the service cable due to a variety of factors that needs to be considered.Jan 6, 2010. #8. 200 amp commercial service i forgot to mention that i am coming from a meter/disco outside and hitting a panel about 50 ft away.Looking at table 310.16;for copper-4/0 and for aluminum 300's.How many breakers in a 200 amp panel; Wire size for 40 amps; Conclusion. To use a 200 amp service, you need #2/0 copper or #4/0 aluminum wiring. Contact an electrician for more information. Making sure you have the right wire size will ensure that your electrical equipment operates properly and does not cause a dangerous situation.The size of wire required for a 200 amp service panel is 4/0 AWG. This is also sometimes referred to as “4 gauge” wire. This wire size will be able to handle up to 200 amps of power before it needs to be replaced. Be sure to use copper or aluminum wire that is rated for outdoor use when running the wire from the main power source to the panel.So take the "kcmil" size of the hot wire you choose, divide by 2.52, and choose a ground wire with that kcmil or larger. (this works out the same aluminum or copper). This will probably be down in the AWG sizes, so you need a kcmil to AWG chart: 1 AWG = 84 kcmil; 1/0 AWG = 106 kcmil; 2/0 AWG = 133 kcmil; 3/0 AWG = 168 kcmil; 4/0 …We used the formula: Power = Phase current × Phase voltage × Power factor. Try the Omnicalculator 100 amps wire size tool to get the proper wire you should install. Arturo Barrantes. The 100-ampere wire size calculator will assist you in choosing the proper wire size for your next equipment installation.When it comes to electrical circuits, safety should always be the top priority. One crucial aspect of ensuring safety is proper wire sizing. In this article, we will discuss the im...Oct 1, 2023 · 200 amp x 100% / 80% = 250 amps (to account for the 80% rule) Next, determine how long your wire run is. Add 20% for 100 feet and 10% for 50 feet. So, if your run is 150 feet, you’ll need to increase the amperage of the wire by 30%. Hence: 250 amps x 1.3 = 325 amps. The conduit size should be able to carry 325 amps. 300ft from disconnect to panel. 200 amps. My calculations show 350 mcm Al for 3.46% vd. The client has a buddy that is a master electrician and is telling him to run 250/250/ (4/0). I'm suggesting 350/350/350 as it's a long run and I don't think derating the nuteral is worth the few bucks of cost saving.Cost. FAQs. Conclusion. The Most Recommended Wire Size (S) for 200a Services. The 200A service recommendations of 2/0 copper and 4/0 aluminum wires were made with the 83% standard in mind. Summed up, it means that your 200 amp service wire size’s ampacity should not be less than 83% of the main service’s rating.Might be shipping cost. Way overpriced at 19.99/ft. Much cheaper to purchase when in stock at the store or even local supply houses. Otherwise product is excellent. by. DTTT. This review is from 500 ft. 2/0-2/0-2/0-1 Gray Stranded CU SER Cable. Response from Southwire Tools SupportFeb 23, 2022. Thank you for your feedback regarding this matter.Hook the neutral wire to one of the larger lugs on the grounded (neutral) buss bar. 14. Install a #4 bonding wire from the ground bushing to the ground bar. 15. Connect the bonding strap or screw to the ground bar. Different manufacturers employ different methods to accomplish this grounding of the panel. 16. Install a #4 ground wire from thewe just did a church that had a 200 and a 400 disconnect feeding 2 panels on the inside. the plans called for a 2/0 to building steel and a 2/0 to water pipe and a #6 to ground rod. the building was wood framed and incomming water was plastic. we placed 2 ground rods (1 at each disconnect) run a 2/0 to each disconnect from the ground rods and connected the ground rods together with 2/0 cadweld The actual wire diameter of #14 copper wire can vary among manufacturers and wire types. The wire size table below gives the typical diameter of #14 copper wire as 0.073- .064 / 1.84-1.63 inches / mm. [Thanks to Anonymous for careful editing] The normal wire size for 100 amp service is 4AWG or 2 AWG for copper wiring and 2AWG, 1 AWG, or 1/0 AWG for aluminum or copper-clad wiring. These wire sizes can also used for direct burial. The 100 amp circuit for 240 volts can handle 24,000W of electricity.May 21, 2023 · If you are looking to install a 200 amp service wire or breaker in your home, the minimum size of wire you will need is 4/0 awg copper wire, or 350 KCMIL if the wire length is over 100 feet. Using the wrong size wire, say 2/0 copper or 4/0 gauge aluminum wire, may cause circuit overload, tripping breakers, and electrical hazards. In the world of DIY projects, having the right tools and materials is essential. When it comes to electrical wiring, one important factor to consider is the gauge size of copper wi...In fact, when applying the 83% rule, we see that 200 amp service wire can have as little as 200A × 0.83 = 166A ampacity. Example: Here are two screenshots of wire ampacity charts for copper wires and aluminum wires in the vicinity of 200A ampacity (we are looking at the median ampacity at 75°C (167°F)):For a 400-amp service, you will need a wire size of at least 350 kcmil for copper wires or 600 kcmil for aluminum wires. It’s essential to adhere to the National Electrical Code (NEC) and local regulations, and consult with a qualified electrician to ensure proper installation and safety. 400 amp Service Wire Size Chart:4-gauge wire. 70 amps. 3-gauge wire. 85 amps. 2-gauge wire. 95 amps. These ratings are for standard copper NM sheathed cable, but there are instances where these amperage ratings vary. For example, there is aluminum wiring in some homes, and aluminum wires have their own ampacity-carrying capacity.Wire Size Chart: Allowable Ampacities of Conductors in Raceway, Cable, or Earth. ... NFPA 70, National Electrical Code, Table 310.15(B)(18) SIZE 150°C (302°F) 200°C (392°F) 250°C (482°F) 250°C (482°F) 250°C (482°F) 450°C (842°F) 450°C (842°F) AWG or kcmil TINNED COPPER TINNED COPPER NPC 2%-10% NPC 2%-10% "A" NICKEL NPI NPC 27%The center, which is a division of the National Weather Service, observed conditions of an extreme geomagnetic storm at 6:54 p.m. ET on Friday evening, reaching …Oct 1, 2023 · When looking for a 200 amp service entrance wire size, you should consider the 3% allowable voltage drop by NEC standards. As a result, you need to use a much bigger wire size than the one for short-distance setups. In this case, instead of using a 2/0 copper wire, you should use 300 kcmil copper with only a 2.78% voltage drop. A 50 amp sub panel will require at least 3 to 6 AWG wires. Here, I considered the distance around 55 feet. If the distance is longer, I suggest you use thicker and lower gauge wires. If the sub-panel distance from the main panel is 150 or 200 feet, you can use 4 AWG copper or 3 AWG aluminum or copper-clad wires.Recycled copper crafts can be a lot of fun to make. Visit HowStuffWorks to learn all about making recycled copper crafts. Advertisement Making crafts by hand can be extremely rewar...The minimum wire size for a 100 amp sub-panel is 4 AWG copper or 2 AWG aluminum according to the 83% rule, which defines that the wire size can handle 83% of the amperage of the sub-panel. In these conditions, 83% of 100 amps is 83 amps, so the wire size can handle at least 83 amps.The wire size needed for a 200-amp service depends on the distance between the power source and the main electrical panel, with copper wiring typically …A 200-amp service with 125 ft run using 3% allowable voltage drop. For 3 AWG copper wire, k = 21 and allowable amps = 205. Using the formula: Neutral Wire Size =2 × 200 × 125 × 21205 × 0.03= 2 AWG. Therefore, the minimum recommended size is 2 AWG copper wires for this 200-amp service with a 125-foot run.How many breakers in a 200 amp panel; Wire size for 40 amps; Conclusion. To use a 200 amp service, you need #2/0 copper or #4/0 aluminum wiring. Contact an electrician for more information. Making sure you have the right wire size will ensure that your electrical equipment operates properly and does not cause a dangerous situation. 350 Amps. 350 kcmil Copper Wire. 500 kcmil Aluminum Wire. 400 Amps. 400 kcmil Copper Wire. 600 kcmil Aluminum Wire. This table is quite easy to use. For example, let’s say you are trying to figure out the feeder wire size for 300 amp service. By checking this table, you can see you will need either 4/0 AWG copper wire or 300 kcmil aluminum ... 2-2-2-4 Copper SER Service Entrance Cable. Sold by the foot cut to length. ... SRML Wire - 150°C/200°C; SF-2/SEW-2 Wire - 200°C; PTFE Wire - 200C; TGGT Wire - 250°C; MG Wire - 450°C/550°C; Medium Voltage Cable. ... Service Entrance Cable: Wire Size: 2 AWG # of Conductors: 3 Conductors w/ Ground: Conductor Material: Bare Copper:The wire size needed for a 200-amp service depends on the distance between the power source and the main electrical panel, with copper wiring typically …Square D Homeline 200 Amp 40 Es 80 Circuit Main Breaker Plug On Neutral Load Center Value Pack In The Bo Department At Lowes Com. Breaker Box Safety How To Connect A New Circuit Diy Family Handyman. Single Family Dwelling Electrical Services Rated 225 To 600 Amps. Circuit Breaker Wiring Diagrams Do It Yourself Help Com.While looking for the ground wire for 100 amp service, it can be as thin as 10 AWG or as thick as 2/0 AWG. The minimum ground wire size for 100 amp service is 8 AWG copper or 6 AWG aluminum wire. It can change based on several factors. You will need to consider a few things before you decide on the exact ground wire size.What size wire do I need for a 200 amp service? For a 200-amp service, you typically need copper wire sized at least 2/0 AWG (American Wire Gauge) or aluminum wire sized at least 4/0 AWG for the service entrance conductors. However, this can vary depending on local electrical codes and the length of the run, so consult a …Get free shipping on qualified 200 Service Entrance Wires products or Buy Online Pick Up in Store today in the Electrical Department. ... Total Wire Length (ft.) 250 ... The Wire Size Calculator below will calculate the proper wire size for a circuit based on circuit amps, preferred (or available) wire insulation, conductor type and installation specifications. For more advanced considerations, use the Wire Size Calculator or the Advanced Wire Size Calculator. If you apply the NEC 80% rule, 250 kcmil wire can handle up to 204 amps. That’s why it is considered a 200 amp wire. Basically, we are trying to answer what ground wire do you need for 200 amp service. If you consult the copper ground wire size chart above, you can see that you will need a 2 AWG copper ground wire to adequately ground a 250 ...Might be shipping cost. Way overpriced at 19.99/ft. Much cheaper to purchase when in stock at the store or even local supply houses. Otherwise product is excellent. by. DTTT. This review is from 500 ft. 2/0-2/0-2/0-1 Gray Stranded CU SER Cable. Response from Southwire Tools SupportFeb 23, 2022. Thank you for your feedback regarding this matter.The size of the conduit needed for a 200-amp service will depend on the length of the wire run. Generally, you should use 3/4 inch or 1 inch conduit for up to 100 feet and one 1 1/4 inch or larger for longer runs. Always consult a professional electrician or check with your local permit office before beginning any electrical wiring project.Feb 11, 2024 · You also need to be sure you have all the permits required for this type of work. AWG size at 200-amps service vs distance to maintain a 3% or less voltage drop are shown in the next table: Show entries. Servica Wire Size at 200A. Maximum Distance. Copper 2/0 AWG. 50 Feet. Copper 3/0 AWG. 100 Feet. Using the formula: Neutral Wire Size =2 × 200 × 125 × 21205 × 0.03= 2 AWG. Therefore, the minimum recommended size is 2 AWG copper wires for this 200-amp …This DC wire size calculator will help you calculate the wire gauge automatically. Example: For 100 amp service, you will a wire with at least 125A ampacity. That means you will need a 1 AWG wire for 100 amps since it has 130A ampacity. Wire size chart. In this chart, you can find wire sizes for 1 amp, 10 amp, 20 amp, 30 amp, 40 amp, 50 amp, 60 ...Nov 7, 2023 · A 200-amp service with 125 ft run using 3% allowable voltage drop. For 3 AWG copper wire, k = 21 and allowable amps = 205. Using the formula: Neutral Wire Size =2 × 200 × 125 × 21205 × 0.03= 2 AWG. Therefore, the minimum recommended size is 2 AWG copper wires for this 200-amp service with a 125-foot run. Cerro Wire, PowerStream Technology and Armstrong’s Supply Company’s websites are some online resources that provide wire size vs. amps charts. Cerro Wire provides a chart of differ...The size of wire required for a 200 amp service panel is 4/0 AWG. This is also sometimes referred to as “4 gauge” wire. This wire size will be able to handle up to 200 amps of power before it needs to be replaced. Be sure to use copper or aluminum wire that is rated for outdoor use when running the wire from the main power source to the … Enter the information below to calculate the appropriate wire size. Voltage - Enter the voltage at the source of the circuit. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Amperes - Enter the maximum current in amps that will flow through the circuit. Roughly speaking, the NEC 310-16 requirement states that for a 200 amp copper or aluminum wire, you have to add 20% to the total amps for every 100 feet of distance. Example: Let’s say you want to use 200 amp service 100 feet away from the sub panel.4 AWG copper ground wire for 200 amp service (at short distances). 0 AWG aluminum ground wire for 200 amp service (at short distances). Now, this is relevant is the hot wire is short. If you need a 200 amp service 50 feet, 100 feet, 150 feet, or 200 feet away (Example: 200 amp sub-panel 100 feet away), you also need to account for voltage drop.In the world of DIY projects, having the right tools and materials is essential. When it comes to electrical wiring, one important factor to consider is the gauge size of copper wi...This is denoted by kcmil or MCM. We have 250 kcmil, 300 kcmil, 350 kcmil, 400 kcmil, 500 kcmil wires, and so on. The biggest kcmil wire is the 2000 kcmil wire. Metal used. Copper and aluminum wires are most commonly used. Same-size copper wires can carry a little more current than aluminum wires. Temperature.The size of wire required for a 200 amp service panel is 4/0 AWG. This is also sometimes referred to as “4 gauge” wire. This wire size will be able to handle up to 200 amps of power before it needs to be replaced. Be sure to use copper or aluminum wire that is rated for outdoor use when running the wire from the main power source to the panel.May 5, 2024 · The size of wire required for a 200 amp service panel is 4/0 AWG. This is also sometimes referred to as “4 gauge” wire. This wire size will be able to handle up to 200 amps of power before it needs to be replaced. Be sure to use copper or aluminum wire that is rated for outdoor use when running the wire from the main power source to the panel. 200 Amp Service Ground Wire Size. It necessitates 2/0 copper wire for 200 amp service, or #4/0 aluminum or #4/0 copper-clad wire are other options. Many electrical contractors prefer a 4/0 plated copper or aluminum 200 amp service ground. The output voltage and the cable length decide which wire is utilized, as longer runs call for …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 ...For a 100 amp service, many electricians opt for wire size #2 or #1 AWG aluminum or copper-clad wiring. This is because aluminum conducts electricity slightly differently than copper. I know it can be a bit confusing, but the main takeaway for aluminum wire size is generally to go a size up (meaning a lower number on the gauge) compared to copper.This wire size is one of the favorites for large-amp needs. It is the perfect 200 amp wire size with 200 ampacity (3/0 copper wire ampacity has 200A ampacity) at 75°C. It also has a very high 2.7 kA Preece fusing current (power factor is already factored in). Most 3/0 gauge wires with 85.00 mm2 cross-section are rated up to 600 volts.Apr 10, 2021 · An often-used rule-of-thumb is to jump up one wire size for each 100 feet of a long run. SERVICE SIZE WIRE SIZE. 100 amp #4 and #3. 125 amp #2 or #1. 150 amp #1/0. 200 amp #2/0. 225 amp #3/0 or #4/0. The neutral wire is often one or two sizes smaller than the two hots. The correct sizing of the neutral depends on doing a calculation of the ... The size of the conduit needed for a 200-amp service will depend on the length of the wire run. Generally, you should use 3/4 inch or 1 inch conduit for up to 100 feet and one 1 1/4 inch or larger for longer runs. Always consult a professional electrician or check with your local permit office before beginning any electrical wiring project.Cable shall be UL-listed Type SE, suitable for operation at 600 volts. Conductors shall be annealed copper, weather resistant PVC jacketed, as manufactured by Southwire Company or approved equal. Conductor Size/Const. AWG or kcmil Phase Conductor & Neutral Equipment Ground Conductor 60°C 75°C 90°C Dwelling 10-10-10 1 12 428 X …If you need more power in your home, you can install 200 amp services. For 200 amp service, you want a minimum of four or six ground. The conductor is the wire that carries the electrical power. To upgrade a 200 amp wire, you can use special fixtures with aluminum. When using the aluminum wire, you should consider using the copper fixtures ...We generally use these thick wires when we need more than 200 amp service. Which kcmil wire exactly we need for carrying high currents is determined by the kcmil wire size chart (check the chart further on). Example: What is the ampacity of 400 kcmil copper wire? If you check the kcmil ampacity chart below, you can see that 400 kcmil copper ...Wire Size & Amp Ratings. Download Ampacity Chart PDF: Ampacity Chart. Understanding Ampacity: Ampacity refers to the maximum safe current a conductor can carry …250.66 is for the GEC not the neutral, however art. 250.24(C)(1) does reference that the grounded conductor not be smaller than the required GEC in Table 250.66. That being said unless you can calculate the neutral load and determine a #4 is satisfactory I would not do this. I generally downsize one wire size for the neutral.As a result, upgrading to a 200 amp service is fairly frequent. But, the tricky part of this is selecting the right length of wiring. What is the 200 amp wire size? You’ll need to get a #2/0 copper wire, #4/0 aluminum wire, or copper-clad aluminum wire to begin. Copper wires have high conductivity and are heat and corrosion-resistant.Alright, figuring out what size you need for 90 amp service is fairly certain. We will have to consult the NEC 310.16 table for copper and aluminum wire capacities.On top of that, we will have to account for voltage drop if we want to have a 90 amp service 50, 100, 150, 200 feet away, and so on.. We’ll start by looking at the typical 90 amp wire gauge.Each has a different ampacity for a specified gauge size, and these ampacities are found in NEC® Table 310.15(B)(16) for the calculations in this app. For example, 3/0 AWG copper has an ampacity of 200 amps at 75℃, while 3/0 AWG aluminum has an ampacity of 155 amps at 75℃. WIRE / CABLE TYPE:

For a 200 amp breaker, the minimum recommended wire size is 2/0 AWG copper or 4/0 AWG aluminum. However, 3/0 AWG copper wire is a better option since it has higher maximum ampacity (200-225 amps). This ensures that the wire can safely handle the maximum current load of the breaker, without overheating or posing a fire risk. The Applications of .... Tvokids scratch

Jan 6, 2010. #8. 200 amp commercial service i forgot to mention that i am coming from a meter/disco outside and hitting a panel about 50 ft away.Looking at table 310.16;for copper-4/0 and for aluminum 300's.we just did a church that had a 200 and a 400 disconnect feeding 2 panels on the inside. the plans called for a 2/0 to building steel and a 2/0 to water pipe and a #6 to ground rod. the building was wood framed and incomming water was plastic. we placed 2 ground rods (1 at each disconnect) run a 2/0 to each disconnect from the ground rods and connected the ground rods together with 2/0 cadweld200 Amp Wire = 200A × 100% / 80% = 250A Ampacity. That means that you can to use a wire that has an ampacity of 250A or higher in order to set up a 200 amp circuit. As you …1-48 of 225 results for "200 amp wire" Results. Check each product page for other buying options. Nassau Electrical Supply 200' Monmouth 4/0-4/0-4/0 Aluminum URD Triplex Cable. ... 50 FT Ground Wire 4 AWG Gauge Solid Bare Copper 200A Service Cables Electronic Stranded Wire Cable Electrics DIY. 5.0 out of 5 stars. 1. $113.72 $ 113. 72. FREE ...The size of the ground wire you need for a 200 amp service will depend on several factors, including the length of the wire run, the type of wire you are using, and the specific requirements of your local building code. In general, a 200 amp service will require a ground wire that is at least 2/0 copper or 4/0 aluminum or copper-clad aluminum ...Service Entrance Wires. Copper Service Entrance Wires. 1ResultsMax Amps: 200Conductor Material: CopperClear All. Sort by:Top Sellers. Top SellersMost PopularPrice Low to HighPrice High to LowTop Rated Products. Get It Fast. In Stock at Store Today. Availability. Show Unavailable Products.When it comes to electrical circuits, safety should always be the top priority. One crucial aspect of ensuring safety is proper wire sizing. In this article, we will discuss the im...The cost of wire for 200 amp service varies based on the home size, wire type. For a two-thousand square foot building, you will spend more than thousand-five hundred dollars. It is recommended to use copper-clad aluminum or copper wire if the residential place has the high load capacity.250.66(A) says the grounding electrode to a single or multiple rods shall not be required to be larger than a #6 copper wire. But in 250.66 it says for a 2/0 copper service entrance conductor, which you have for the 200 amp service, a #4 copper conductor. For residential I've always used a #4 because inspectors seemed to ask for it.250.66 is for the GEC not the neutral, however art. 250.24(C)(1) does reference that the grounded conductor not be smaller than the required GEC in Table 250.66. That being said unless you can calculate the neutral load and determine a #4 is satisfactory I would not do this. I generally downsize one wire size for the neutral. In fact, when applying the 83% rule, we see that 200 amp service wire can have as little as 200A × 0.83 = 166A ampacity. Example: Here are two screenshots of wire ampacity charts for copper wires and aluminum wires in the vicinity of 200A ampacity (we are looking at the median ampacity at 75°C (167°F)): Rewiring projects cost anywhere between $1,500 and $10,000 on average, depending on the complexity and the size of the rewiring. You can anticipate spending between $2 and $4 per square foot of wire, including labor and materials. Wire material ranges from $0.25 to $1.60 per linear foot..

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