What Size Wire For 100 Amp Service 400 Ft Away
Electrical Service Entry Cable Sizes for Long Wire Runs
How much to increase SEC wire size over longer distances
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Electrical service entry wire sizes are calculated for long wire runs in which the wire size must be increased to avoid an un-wanted voltage drib. We include links to wire size and voltage drop calculators.
This article series gives photos and tables of electrical service entry cable sizes, electric branch excursion wire sizes, bong wire, phone wire, thermostat wire, and ampacity or fuse/circuit billow ratings.
We also provide an Article Index for this topic, or you can endeavor the page peak or lesser SEARCH BOX as a quick way to find data you need.
Tables of SEC Sizes for Long Wire Runs for Copper & Aluminum Cable
This page gives the necessary increase in electrical service entry wire size for long runs, for example betwixt the electric meter and the main electrical panel.
If you demand wire sizes for shorter service entry cables up to 200A or for both short and long branch circuit wires from 15 to 50A
see SE Cable & Co-operative Circuit WIRE SIZES vs AMPS
Summary Tabular array of Service Entry Cable Sizes
(Detailed tables follow the table given just below)
Electric Service Entry Wire Sizes Needed for Longer Run Lengths | ||||||||
Maximum Run Length in Ft. vs AWG Wire Size, @ <= 3% Voltage Drop, 120V per SEC Conductor | ||||||||
| 25 ft. | 50 ft. | 100 ft. | 150 ft. | 200 ft. | 300 ft. | 400 ft. | ||
| Wire Material | AMPS | Wire Size AWG | ||||||
| Copper | 100A | 4 | 4 | one | 2/0 | three/0 | 300 kcmil | 500 kcmil |
| Aluminum | 100A | ii | 2 | ii/0 | 4/0 | 300 kcmil | 600 kcmil | 1000 kcmil |
| Copper | 200A | 1/0 | 1/0 | 3/0 | 300 kcmil | 500 kcmil | 1000 kcmil | 500 kcmil3 |
| Aluminum | 200A | 2/0 | ii/0 | 300 kcmil | 600 kcmil | 1000 kcmil | 600 kcmil 3 | 1000 kcmil3 |
Notes to the tabular array in a higher place
- Using two 120VAC conductors, <= iii% maximum driblet in voltage
- 240V Service provided as two separate 120VAC cables; All of these services are single phase. Three phase power typically reduces the wire size to the adjacent smaller.
- Requires ii parallel cable sets
- Watch out: these are example wire or cable sizes vs. run or length for the specific parameters named here and entered in the wire size and length computer. Your installation may differ. For safety and for code compliant electrical wiring, be sure to cheque with your local electrical code inspector and electrical code provisions.
- Adapted from two sources:
- VOLTAGE DROP TABLE, [PDF], retrieved 2017/09/26, Cerrowire LLC, 1099 Thompson Road SE, Hartselle AL 35640, U.s., Tel: 256-773-2522, original source: http://world wide web.cerrowire.com/files/file/voltagedrop.pdf
The 300 ft and 400 ft cable length data is from
- Cablevision size recommended based on voltage driblet calculations. Calculated past Online voltage drop estimator: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Web page: https://world wide web.southwire.com/estimator-vdrop
Detailed Copper SEC Sizes for Longer Cable Distances
The table beneath shows Copper SEC wire sizes for various run lengths - be sure to see the additional assumptions in the table notes. The voltage drib is held to under 3% across the long distance wire runs in these tables.
Copper SEC Wire Size for Long Runs for 200A Service | |||
| Cablevision Sizeane | Distance 8 Ft. / M | Voltage Drop % | Phase |
| 3/0 AWG | 200 - 225seven / 60 | ii.83 | ane |
| 3/0 AWG | 200 / 60 | 2.45 | three |
| 4/0 AWG | 250 - 260seven / 75 | 2.89 | 1 |
| iv/0 AWG | 250 / 75 | 2.58 | 3 |
| 250 kcmil | 2907 / 88 | ||
| 250 kcmil | 2907 - 300 / ninety | 2.72 | three |
| 300 kcmil | 300 - 320vii / 90 | ii.78 | one |
| 300 kcmil | 350 / 100 | 2.82 | iii |
| 350 kcmil | 3507/ 100 | 2.92 | ane |
| 350 kcmil | 400 / 120 | 2.89 | 3 |
| 400 kcmil | 450 / 135 | 2.97 | 3 |
| 500 kcmil | 400 - 4307 / 120 | 2.67 | 1 |
| 600 kcmil | 450 - 4757 / 135 | 2.74 | 1 |
| 500 kcmil | 500 / 150 | ii.89 | 3 |
| 600 kcmil | 475 / 145 | ane | |
| 750 kcmil | 500 - 5357 / 150 | two.72 | ane |
| 1000 kcmil | 6157 / 187 | ane | |
Notes to the tabular array above:
- Cable size recommended based on voltage driblet calculations. Calculated by Online voltage drop calculator: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com E-mail: CableTechSupport@southwire.com Web page: https://world wide web.southwire.com/calculator-vdrop
- Electrical Panel & Service Size: 200A 240VAC, Ending amps if voltage drop were three% will be 194A
- Voltage: 240 VAC
- Maximum Voltage Drib: three%
- Parallels (Sets) ane
- Usher installation is direct-cached, in conduit, OR overhead, unless otherwise noted
- See this Electrical WIRE AMPACITY Chart [PDF] from CerroWire, retrieved 2021/11/25 original source: https://www.cerrowire.com/wp-content/uploads/2021/04/Cerrowire_Ampacity_Chart_210405.pdf
- Maximum wire run distance changes by required temperature rating:
The Amperage rating and distancees shown are for 90°C (194°F) THWN-2, THHN, XHHW-2, USE-2 - copper wire;
Watch out: Annotation that dropping to 60°C (140°F) NM-B, UF-B copper wire, the maximum run lengths volition be substantially shorter.
- For smaller wire size ampacities & run lengths (#14 copper or #12 aluminum) up through typical residential SEC wire sizes and amps
Encounter SE CABLE & Co-operative Circuit WIRE SIZES vs AMPS
Spotter out: the engineering piece of work and derivation of the tabular array above is derived from the sources listed below including manufacturer'southward tables and online voltage drop calculators but may non be correct for your specific installation. Bank check with your engineer or electrician.
Watch out: if you lot are non trained and qualified to install electrical wiring a mistake can result in burn down, injury, or death. Be sure you review your work plan with your local electrical inspector and that piece of work is washed to the electric code for the land and city where you live. In the U.S. that'southward the U.South. NEC.
Detailed Aluminum SEC Cable Sizes for Long Wire Runs
The tabular array below shows Aluminum SEC wire sizes for diverse run lengths - be sure to run across the additional assumptions in the table notes.
Aluminum SEC Wire Size for Long Runs for 200A Service | |||
| Cablevision Size1 | Distance Ft. / Thousand | Voltage Drop % | Phase |
| 300 kcmil | 200 / sixty | 2.79 | one |
| 250 kcmil | 200 / sixty | 2.77 | 3 |
| 400 kcmil | 250 / 75 | ii.85 | 1 |
| 350 kcmil | 250 / 75 | 2.69 | 3 |
| 500 kcmil | 300 / 90 | 2.92 | 1 |
| 400 kcmil | 300 / 90 | 2.96 | 3 |
| 750 kcmil | 350 / 100 | 2.67 | i |
| 500 kcmil | 350 / 100 | 2.95 | 3 |
| 1000 kcmil | 400 / 120 | 2.61 | 1 |
| 750 kcmil | 400 / 120 | ii.64 | 3 |
| 1000 kcmil | 450 / 135 | 2.94 | i |
| 750 kcmil | 450 / 135 | 2.97 | iii |
| Not Bachelor | 500 / 150 | 1 | |
| chiliad kcmil | 500 / 150 | two.83 | 3 |
Notes to the table to a higher place: Assumptions
- Cable size recommended based on voltage drop calculations. Calculated by Online voltage drop calculator: 2019/07/23, Southwire, Tel: i-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Web folio: https://www.southwire.com/reckoner-vdrop
- Electrical Panel & Service Size: 200A 240VAC, Catastrophe amps if voltage drop were iii% will be 194A
- Voltage: 240 VAC
- Maximum Voltage Driblet: 3%
- Parallels (Sets) 1
- Conductor installation is direct-cached, in conduit, OR overhead, unless otherwise noted
Scout out: if you are not trained and qualified to install electric wiring a fault tin can result in burn, injury, or death. Be certain yous review your work programme with your local electric inspector and that work is done to the electric code for the country and metropolis where yous live. In the U.S. that's the U.Southward. NEC.
How to Use a Voltage Drib Calculator to Determine Reqired Service Entry Wire Size
Here nosotros give examples and compare the results of using two instance wire size and voltage drib calculators.
You volition run across that Southwire and Paige calculators give similar results.
ane. Southwire's Voltage Drop Calculator example calculating SEC wire size
Southwire's wire size calculator at http://www.southwire.com/back up/voltage-drop-calculator.htm is like shooting fish in a barrel to use and articulate.
The user specifies the number of phases (1 or 3), usher (copper or aluminum), installation (straight buried, conduit, or overhead) and the input voltage, maximum allowed voltage drop (I utilise 3%), the length of the cable run, and the desired electric current (amps) at the end of the cable run. The calculator gives an advisable wire selection and its parameters, such as this:
Example: Unmarried phase, aluminum usher, directly buried, 120VAC, 3% maximum voltage drop, 250 ft. cable run length, 100A electric current at finish of cable
Result: 1 conductors per stage utilizing a #400 Aluminum conductor will limit the voltage drib to ii.94% or less when supplying 100.0 amps for 250 feet on a 120 volt arrangement.
Changing the case higher up to 240 VAC, keeping other parameters the aforementioned gives this result:
Result: 1 conductors per phase utilizing a #iii/0 Aluminum usher will limit the voltage drop to 2.82% or less when supplying 100.0 amps for 250 feet on a 240 volt system.
2. Paige Wire Size Calculator example computing SEC wire size
Paige Wire's voltage wire size calcuator at http://www.paigewire.com/pumpWireCalc.aspx is also piece of cake to use and clear. Testing with the following parameters:
Example: 240 VAC Unmarried Phase, 100A, 250 ft. run, three% voltage drib allowed,
Result: ane AWG Copper or 2/0 Aluminum
Changing the example above to 120VAC, keeping other parameters the same gives this outcome:
Result: iii/0 AWG Copper or 250 MCM Aluminum
Siemens offers an XLS spreadsheet [ http://w3.usa.siemens.com/united states/internet-dms/cyberspace/consultingengineerscomm/general/Docs/DA_VD_Calculator_V1.ane.xls - this address leaves InspectApedia.com] that tin exist used to calculate voltage dropas do other sources, and there are numerous online voltage driblet calculators - I like the Southwire figurer given in a higher place. Be sure to compare the calculator's result with what the applicable electrical code will permit.
Voltage Drop Index - VDI - when to increase wire size for long electrical wire runs
The voltage driblet index or VDI is a reference number that is based on the electrical resistance of a wire and is calculated as
VDI = (Amps ten Feet of run) / (% Voltage Drop allowed ten Voltage)
Typical allowable voltage drop is 2% or four% depending on the application.
3% is the most commonly-accepted voltage drop target.
More most the VDI and VDI tables are given
at SE CABLE & WIRE SIZE TABLES vs AMPS
Question: what size Aluminum Service Entry Cable do I demand for a 200A panel on a 400 foot length?
2019/07/23 Bob south. said:
I'm running a 400 foot chief cable from street to abode, I want 200amp service and apply aluminum wire. What size do I apply to recoup for distance
Reply:
From the table of Aluminm SEC Cable Sizes for Long Runs you'll encounter the answers given below,
Answer: 200A, Aluminum wire, 400 foot run, direct buried SEC cable
For single phase ability: 1000 kcmil aluminum wire will have a voltage drop under three% fora 400 foot run of directly buried cable and a 200VAC single phase electrical service. That gives us 194 Amps at the end of the SEC run.
For iii phase power: 750 kcmil aluminum wire will have a voltage drib under 3% for a 400 human foot run of directly cached cable and a 200VAC 3 stage electrical service. That gives us 194 Amps at the terminate of the SEC run.
Using a typical online voltage drop figurer, keeping your voltage driblet belwo 3%, and using your 400 foot run and Aluminum wire for a 200 VAC service, we plugged the data into Southwire's voltage drop calculator to run across what wire size would suit.
Details about Wire Size vs Voltage Driblet for Long SEC Wire Runs
Voltage driblet across a wire is proportional to the current flow and wire resistance; for AC ability such equally your service entry cablevision (SEC) full impedance and power factor (the ratio of power loss) are considered also.
None of the standard voltage drop tables go beyond 200 anxiety of wire run. At 200 ft and 200A the tables get to 350 to 500MCM copper wire and for 200 ft and 200A the tables get to 600 MCM aluminum wire (Cerrowire.com)
For longer runs (like your 400 ft) your engineer would either perform the voltage driblet calculation and wire size. Or utilize one of the online voltage drop calculators. Southwire provides an piece of cake-to-use voltage drib figurer that I recommend. .
I expect you're going to end upwards with at least 600 or 750 MCM AL wire - such a big size may not be practical even though the Cu will of class be more expensive. Let's look at the details.
- Example calculation i - Copper Wire, one phase power
- Power Factor: 100%
- Wire Size: 500 kcmil Copper
- Stage: Single phase
- Usher: Aluminum
- Installation: Straight buried
- Voltage: 240VAC
- Cablevision run: 400 ft.
- Maximum voltage drop: three%
- Current at end of cable: 194 Amps (200A - [.03 x 200])
- Calculated Voltage Drop: with 500 kcmil copper wire: 2.67% - this is within the iii% limit
i conductor per phase utilizing a 500 kcmil Copper conductor installed Direct Buried will limit the voltage drop to 2.67% or less when supplying 194 amps for 400.0 anxiety on a 240 volt 1 stage system.
- Case calcuation 2 - Aluminum Wire, 1 stage power
- Power Factor: 100%
- Wire Size: 1000 kcmil Aluminum
- Phase: Single phase
- Conductor: Aluminum
- Installation: Direct buried
- Voltage: 240VAC
- Cable run: 400 ft.
- Maximum voltage driblet: 3%
- Electric current at stop of cable: 194 Amps (200A - [.03 x 200])
- Calculated Voltage Driblet: thousand kcmil aluminum wire: 2.61% - this is within the 3% limit
1 conductor per stage utilizing a chiliad kcmil Aluminum usher installed Directly Buried will limit the voltage drop to 2.61% or less when supplying 194 amps for 400.0 feet on a 240 volt 1 phase system.
- Instance calcuation 2 - Aluminum Wire, three Stage power
- Power Factor: 100%
- Wire Size: 750 kcmil Aluminum
- Phase: Three phase
- Conductor: Aluminum
- Installation: Direct cached
- Voltage: 240VAC
- Cablevision run: 400 ft.
- Maximum voltage driblet: 3%
- Current at finish of cable: 194 Amps (200A - [.03 ten 200])
- Calculated Voltage Drop: 1000 kcmil aluminum wire: 2.64% - this is within the three% limit
1 conductor per phase utilizing a 750 kcmil Aluminum conductor installed Direct Buried will limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 anxiety on a 240 volt 3 stage system.
- Example calcuation 2 - Copper Wire, 3 Phase ability
- Ability Gene: 100%
- Wire Size: 750 kcmil Aluminum
- Phase: Three phase
- Conductor: Aluminum
- Installation: Direct buried
- Voltage: 240VAC
- Cable run: 400 ft.
- Maximum voltage drop: 3%
- Current at end of cable: 194 Amps (200A - [.03 10 200])
- Calculated Voltage Driblet: 350 kcmil copper wire: 2.89% - this is within the 3% limit
1 usher per phase utilizing a 750 kcmil Aluminum conductor installed Direct Buried will limit the voltage drib to ii.64% or less when supplying 194 amps for 400.0 feet on a 240 volt 3 phase system.
Online voltage drop calculator used: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Electronic mail: CableTechSupport@southwire.com Spider web folio: https://www.southwire.com/calculator-vdrop
Key points in computing voltage drop and selecting wiring cable
- three% is the typical commanded voltage drop for SEC feeder wires
- 5% is the maximum recommended voltage drop for private branch circuits.
- The 200A service is not necessarily the amps used in the voltage drop calculation though we've kept the 200A figure for these case calculations. The engineer doing a straight voltage drop calculation adds up the anticipated electric current load or wattages for all of the circuits being fed from the console.
Total Watts / Circuit Voltage (110 or 220) = Full AMPS [Or more conservative: use your nominal 200A console and breaker rating]
- Watch out: with a 400 foot run your 200A wire size may be then large that it will not fit in the standard wiring lugs in your 200A console. Your electrical supplier an provide a wire size reducer that can make the connexion betwixt a larger diameter SEC wire and the lugs in your electrical panel.
- Watch out : when running larger service wires y'all may likewise need to run a larger service console grounding usher to earth.
Reader Comments & Q&A
Actually? yous ran or plan to run #x copper wire 2,500 anxiety - nearly one-half a mile of electrical wire. In conduit?
There is only no way that you can run a conventional 15A o 20A 120V or even 240V wire using #10/two copper wire from your habitation to a barn that'south most half a mile away using whatsoever conventional wiring ways. The wire will have such a big voltage drop that your delivery voltage will be too low and your pump either won't run or will have constant trouble.
Here we discuss using a voltage driblet calculator (we like i provided by Southwire) at which you input the bones parameters of
- cable run length
- voltage
- commanded voltage drop (normally limited to 3%)
- current(amp) required at terminate of cablevision
- number of parallel wire set up
I ran your case for two solutions:
Example one: 2500 ft., 15Amps, 120VAC, and the wire size calculator returns
one conductor per phase utilizing a 400 kcmil Copper conductor installed Straight Cached will limit the voltage drop to ii.95% or less when supplying 15 amps for 2500.0 feet on a 120 volt 1 phase organisation.
OR
Case ii: 2500 ft., 15Amps, 240VAC, and the wire size calculator returns
ane conductor per phase utilizing a 3/0 AWG Copper conductor installed Straight Cached will limit the voltage drib to 2.74% or less when supplying fifteen amps for 2500.0 feet on a 240 volt one phase system.
Frankly, if I were going to the problem and cost of running half a mile of electrical wire I'd run a 240V line to take a fleck more capacity at the other end -
and I'd consider going to a 20A excursion, for which you'd need
1 conductor per phase utilizing a 250 kcmil Copper conductor installed Straight Cached volition limit the voltage drib to two.69% or less when supplying 20 amps for 2500.0 feet on a 240 volt 1 phase system.
Why? What are the chances that once electrical service is brought to an isolated building nobody is going to want to run more than just a well pump? What about a light, or a receptacle to ability an electric drill?
Shown above is a wire size table adapted from Encorewire.com cited theron
I'd practice some shopping or consider an alternative power source (Solar ?)
Consider that at some suppliers we checked online (you may find improve price from a majority electrical wire supplier)
the cost for 2,500 ft of iii/0 copper electric wire is over $11,000. U.South.
the cost for 2,500 ft. of 400 kcmil copper wire is effectually $thirty,000 U.S.
Thats for using UF-rated wire - intended for direct burial into soil.
If you instead desire to endeavor to run half-a mile of conduit - not something that's necessary in my OPINION, and if you used a 3/iv" bore flexible water-tight non-metal conduit similar that provided past Southwire, shown beneath, you lot may salve past buying private conductors instead of sheathed UF SEC cable, at $136 / 100 ft., you'll add nearly some other $3,400. U.Due south. varying upwards or down in toll depending on the conduit diameter needed.
This flexible conduit is rated every bit permittd for straight burial or for burial in physical. The conduit wall is Schedule-forty.
Also see conduit products from Hydromaxx.
I have 10/2 UF-B Wire due west/ Ground which runs underground with no conduit for 2500 feet from the control box in the befouled to the two pressure tanks in my pump house.
This is the 3rd time it is shorting out and the well person who installed the system saids he is not an electrician and unable to recommend what kind of wire I need to replace it with.
Something about it is bleeding over causing the short.
Sending 120 volts up the wire and only receiving 58 volts dorsum = which is burning the control components up.
What would exist the correct kind and size of the wires to tell the pump to plough off.
There is inappreciably any load on the wires what would I replace information technology with?
Any feedback would exist profoundly appreciated. 503-663-2244 priano@gmail.com
@Jerry,
When you lot get to longer lengths than illustrated higher up on this page, you need to get to an online voltage driblet figurer every bit noted higher up, such equally:
http://world wide web.southwire.com/support/voltage-drop-calculator.htm
or
http://world wide web.paigewire.com/pumpWireCalc.aspx
The section higher up:
How to Use a Voltage Drop Computer to Determine Required Service Entry Wire Size
volition help you in using those online calculators.
Using a voltage drop calculator as we suggested, you'll see that if you allow a 3% voltage drop your copper wire size for a 15A circuit at 120V and 650 ft needs to be a #ii AWG copper wire
3% is the recommended allowable voltage drop
v% is the maximum permitted drop on a typical co-operative excursion;
If you have v% voltage drop your copper wire could be #4 AWG.
For other readers:
For co-operative circuits at 15A up to 50A and for distances up to 400 ft
you volition find our
Co-operative Excursion Wire Sizes Needed for Longer Run Lengths Table
at SE Cable & WIRE SIZES vs AMPS
What size/type direct burial cablevision exercise I need to provide xv amps with at the end of a 650 ft run?
@Bearding,
Please have a look in the table "Copper SEC Wire Size for Long Runs for 200A Service" at the tiptop of this page.
what size wire for 200amp 140 foot run underground
@Larry, please bank check the sizing tables in the article higher up and let me know if any of that is unclear or confusing
What size service archway cable do I need for a 100 amp service and a 150 ft. run?
Tim
Check out
SE CABLE SIZES FOR LONG WIRE RUNS
at https://inspectapedia.com/electrical/Long-Run-SEC-Cable-Sizes.php
and don't hesitate to ask if that leaves y'all with questions
Thanks This Q&A were posted originally at Hole-and-corner SERVICE LATERAL FAQs
I'm putting undercover electric service to my house. I have 200 amp service. I need 200 feet of hush-hush. What size wire exercise I need.
Bob,
Delight cheque out the tabular array for long runs of aluminum service entry cabling at SE CABLE & WIRE SIZES FOR LONG RUNS
at https://inspectapedia.com/electric/Long-Run-SEC-Cable-Sizes.php
where I repeat your question and give a detailed reply.
Let me know if that information is non clear or if you're left with questions.
I'm running a 400 foot main cable from street to abode, I want 200amp service and utilize aluminum wire. What size do I use to recoup for distance
...
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- SE CABLE & WIRE SIZES FOR LONG RUNS
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- SIZE of WIRE REQUIRED for ELECTRICAL RECEPTACLES for receptacle circuits and like wiring situations
- VOLTS / AMPS MEASUREMENT EQUIP
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What Size Wire For 100 Amp Service 400 Ft Away,
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