what wire to run for 100 amp service

Electrical Service Entry Cable Sizes for Long Wire Runs
How much to increase SEC wire size over longer distances

• POST a QUESTION or Annotate about electrical wire sizes, diameters, and ampacity ratings

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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 united nations-wanted voltage driblet. We include links to wire size and voltage drop calculators.

This article serial gives photos and tables of electrical service entry cable sizes, electrical branch circuit wire sizes, bell wire, phone wire, thermostat wire, and ampacity or fuse/circuit breaker ratings.

Nosotros also provide an Commodity Alphabetize for this topic, or yous can effort the page top or lesser SEARCH BOX as a quick style to find information yous 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 case between the electrical meter and the master electrical panel.

If you need wire sizes for shorter service entry cables upwardly to 200A or for both brusk and long branch circuit wires from xv to 50A

see SE CABLE & Branch Circuit WIRE SIZES vs AMPS

Summary Table of Service Entry Cablevision Sizes

(Detailed tables follow the table given just below)

Electrical 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	four	1	2/0	3/0	300 kcmil	500 kcmil
Aluminum	100A	2	2	2/0	4/0	300 kcmil	600 kcmil	g kcmil
Copper	200A	one/0	1/0	3/0	300 kcmil	500 kcmil	1000 kcmil	500 kcmil3
Aluminum	200A	ii/0	2/0	300 kcmil	600 kcmil	1000 kcmil	600 kcmil 3	1000 kcmiliii

Notes to the tabular array higher up

1. Using two 120VAC conductors, <= iii% maximum drib in voltage
2. 240V Service provided equally ii divide 120VAC cables; All of these services are single phase. Three phase ability typically reduces the wire size to the side by side smaller.
3. Requires 2 parallel cable sets
4. 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 estimator. Your installation may differ. For safety and for lawmaking compliant electrical wiring, exist sure to check with your local electrical code inspector and electrical code provisions.
5. Adapted from two sources:
   • VOLTAGE Drop TABLE, [PDF], retrieved 2017/09/26, Cerrowire LLC, 1099 Thompson Route SE, Hartselle AL 35640, USA, Tel: 256-773-2522, original source: http://www.cerrowire.com/files/file/voltagedrop.pdf

   The 300 ft and 400 ft cable length data is from

   • Cable size recommended based on voltage drop calculations. Calculated by Online voltage drop reckoner: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Spider web page: https://world wide web.southwire.com/calculator-vdrop

Detailed Copper SEC Sizes for Longer Cable Distances

The tabular array below shows Copper SEC wire sizes for various run lengths - be sure to see the boosted assumptions in the table notes. The voltage drop is held to nether 3% across the long distance wire runs in these tables.

Copper SEC Wire Size for Long Runs for 200A Service
Cable Sizei	Distance 8 Ft. / M	Voltage Drop %	Stage
3/0 AWG	200 - 2257 / lx	2.83	1
3/0 AWG	200 / threescore	2.45	3
4/0 AWG	250 - 260vii / 75	2.89	1
4/0 AWG	250 / 75	2.58	three
250 kcmil	2907 / 88
250 kcmil	290seven - 300 / 90	2.72	3
300 kcmil	300 - 320seven / 90	2.78	1
300 kcmil	350 / 100	2.82	3
350 kcmil	350seven/ 100	two.92	1
350 kcmil	400 / 120	2.89	3
400 kcmil	450 / 135	2.97	three
500 kcmil	400 - 4307 / 120	2.67	i
600 kcmil	450 - 475vii / 135	2.74	ane
500 kcmil	500 / 150	2.89	iii
600 kcmil	475 / 145		i
750 kcmil	500 - 5357 / 150	2.72	one
chiliad kcmil	6157 / 187		1

Notes to the table to a higher place:

1. Cable size recommended based on voltage drib calculations. Calculated past Online voltage drop figurer: 2019/07/23, Southwire, Tel: ane-800-444-1700 Website: world wide web.southwire.com E-mail: CableTechSupport@southwire.com Spider web page: https://www.southwire.com/calculator-vdrop
2. Electrical Panel & Service Size: 200A 240VAC, Catastrophe amps if voltage drib were 3% will be 194A
3. Voltage: 240 VAC
4. Maximum Voltage Driblet: 3%
5. Parallels (Sets) 1
6. Usher installation is directly-buried, in conduit, OR overhead, unless otherwise noted
7. See this Electrical WIRE AMPACITY Chart [PDF] from CerroWire, retrieved 2021/11/25 original source: https://world wide web.cerrowire.com/wp-content/uploads/2021/04/Cerrowire_Ampacity_Chart_210405.pdf
8. Maximum wire run distance changes past required temperature rating:

   The Amperage rating and distancees shown are for xc°C (194°F) THWN-2, THHN, XHHW-2, Use-2 - copper wire;

   Watch out: Note that dropping to threescore°C (140°F) NM-B, UF-B copper wire, the maximum run lengths will be substantially shorter.

9. For smaller wire size ampacities & run lengths (#14 copper or #12 aluminum) up through typical residential SEC wire sizes and amps

   Come across SE CABLE & Co-operative CIRCUIT WIRE SIZES vs AMPS

Watch out: the engineering science work and derivation of the table above is derived from the sources listed beneath including manufacturer's tables and online voltage driblet calculators just may not exist correct for your specific installation. Check with your engineer or electrician.

Watch out: if you are non trained and qualified to install electrical wiring a mistake can result in fire, injury, or expiry. Be sure y'all review your work plan with your local electrical inspector and that work is washed to the electrical code for the land and city where you live. In the U.S. that's the U.S. NEC.

Detailed Aluminum SEC Cable Sizes for Long Wire Runs

The table below shows Aluminum SEC wire sizes for various run lengths - be certain to see the additional assumptions in the tabular array notes.

Aluminum SEC Wire Size for Long Runs for 200A Service
Cable Size1	Distance Ft. / M	Voltage Driblet %	Phase
300 kcmil	200 / 60	two.79	ane
250 kcmil	200 / sixty	2.77	3
400 kcmil	250 / 75	two.85	1
350 kcmil	250 / 75	two.69	3
500 kcmil	300 / xc	2.92	1
400 kcmil	300 / 90	2.96	3
750 kcmil	350 / 100	ii.67	1
500 kcmil	350 / 100	ii.95	iii
thousand kcmil	400 / 120	2.61	1
750 kcmil	400 / 120	two.64	3
1000 kcmil	450 / 135	2.94	one
750 kcmil	450 / 135	ii.97	3
Non Available	500 / 150		1
yard kcmil	500 / 150	2.83	3

Notes to the table in a higher place: Assumptions

1. Cablevision size recommended based on voltage driblet calculations. Calculated by Online voltage drib calculator: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Web page: https://www.southwire.com/figurer-vdrop
2. Electrical Console & Service Size: 200A 240VAC, Ending amps if voltage drop were three% will be 194A
3. Voltage: 240 VAC
4. Maximum Voltage Drop: three%
5. Parallels (Sets) 1
6. Usher installation is direct-buried, in conduit, OR overhead, unless otherwise noted

Lookout man out: if y'all are not trained and qualified to install electrical wiring a fault tin can result in burn, injury, or death. Be sure you review your piece of work program with your local electric inspector and that work is washed to the electrical code for the state and city where you lot alive. In the U.S. that's the U.S. NEC.

How to Use a Voltage Driblet Calculator to Determine Reqired Service Entry Wire Size

Here we give examples and compare the results of using two example wire size and voltage drop calculators.

Yous will see that Southwire and Paige calculators requite similar results.

1. Southwire's Voltage Drib Calculator case computing SEC wire size

Southwire's wire size calculator at http://world wide web.southwire.com/support/voltage-drib-calculator.htm is like shooting fish in a barrel to utilize and articulate.

The user specifies the number of phases (1 or three), conductor (copper or aluminum), installation (directly buried, conduit, or overhead) and the input voltage, maximum immune voltage drop (I utilize iii%), the length of the cablevision run, and the desired current (amps) at the cease of the cable run. The calculator gives an appropriate wire choice and its parameters, such as this:

Example: Unmarried phase, aluminum conductor, directly buried, 120VAC, iii% maximum voltage drop, 250 ft. cable run length, 100A current at cease of cable

Effect: one conductors per phase utilizing a #400 Aluminum usher will limit the voltage drib to 2.94% or less when supplying 100.0 amps for 250 feet on a 120 volt organization.

Changing the example above to 240 VAC, keeping other parameters the same gives this issue:

Result: 1 conductors per stage utilizing a #3/0 Aluminum conductor will limit the voltage drop to two.82% or less when supplying 100.0 amps for 250 anxiety on a 240 volt system.

2. Paige Wire Size Calculator case calculating SEC wire size

Paige Wire'due south voltage wire size calcuator at http://world wide web.paigewire.com/pumpWireCalc.aspx is as well easy to use and clear. Testing with the following parameters:

Example: 240 VAC Unmarried Phase, 100A, 250 ft. run, 3% voltage drib allowed,

Result: one AWG Copper or 2/0 Aluminum

Changing the instance above to 120VAC, keeping other parameters the aforementioned gives this result:

Issue: iii/0 AWG Copper or 250 MCM Aluminum

Siemens offers an XLS spreadsheet [ http://w3.united states of america.siemens.com/u.s.a./net-dms/internet/consultingengineerscomm/full general/Docs/DA_VD_Calculator_V1.1.xls - this accost leaves InspectApedia.com] that can exist used to calculate voltage dropas practice other sources, and in that location are numerous online voltage drop calculators - I like the Southwire calculator given higher up. Exist sure to compare the calculator'south result with what the applicative electrical code will permit.

Voltage Drop Index - VDI - when to increase wire size for long electrical wire runs

The voltage drop alphabetize or VDI is a reference number that is based on the electric resistance of a wire and is calculated every bit

VDI = (Amps x Feet of run) / (% Voltage Drop allowed x Voltage)

Typical allowable voltage drop is 2% or iv% depending on the application.

3% is the most unremarkably-accepted voltage drop target.

More about the VDI and VDI tables are given

at SE Cable & WIRE SIZE TABLES vs AMPS

Question: what size Aluminum Service Entry Cable exercise I need for a 200A panel on a 400 foot length?

2019/07/23 Bob southward. said:

I'thousand running a 400 pes master cable from street to home, I want 200amp service and use aluminum wire. What size do I use to compensate for distance

Reply:

From the table of Aluminm SEC Cable Sizes for Long Runs you'll see the answers given below,

Respond: 200A, Aluminum wire, 400 foot run, direct buried SEC cablevision

For single phase power: m kcmil aluminum wire volition have a voltage drop nether 3% fora 400 pes run of straight cached cablevision and a 200VAC unmarried stage electrical service. That gives us 194 Amps at the stop of the SEC run.

For three phase power: 750 kcmil aluminum wire will have a voltage drop under three% for a 400 foot run of direct cached cable and a 200VAC three phase electrical service. That gives united states of america 194 Amps at the terminate of the SEC run.

Using a typical online voltage drop calculator, keeping your voltage drop belwo 3%, and using your 400 foot run and Aluminum wire for a 200 VAC service, we plugged the data into Southwire'south voltage drop calculator to see what wire size would suit.

Details most Wire Size vs Voltage Driblet for Long SEC Wire Runs

Voltage drop beyond a wire is proportional to the electric current menstruum and wire resistance; for AC power such as your service entry cablevision (SEC) full impedance and power factor (the ratio of power loss) are considered too.

None of the standard voltage driblet tables go across 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 drop calculation and wire size. Or use ane of the online voltage drop calculators. Southwire provides an easy-to-utilise voltage drop calculator that I recommend. .

I expect you lot're going to stop up with at least 600 or 750 MCM AL wire - such a big size may not exist practical even though the Cu volition of course exist more expensive. Allow'south look at the details.

1. Example calculation 1 - Copper Wire, one stage power

• Power Factor: 100%
• Wire Size: 500 kcmil Copper
• Phase: Single stage
• Conductor: Aluminum
• Installation: Direct buried
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: 3%
• Current at stop of cable: 194 Amps (200A - [.03 x 200])
• Calculated Voltage Drop: with 500 kcmil copper wire: two.67% - this is within the three% limit

  1 conductor per phase utilizing a 500 kcmil Copper conductor installed Direct Buried volition limit the voltage drop to ii.67% or less when supplying 194 amps for 400.0 feet on a 240 volt 1 stage system.

2. Instance calcuation two - Aluminum Wire, 1 stage power

• Power Factor: 100%
• Wire Size: grand kcmil Aluminum
• Phase: Single stage
• Conductor: Aluminum
• Installation: Direct cached
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: 3%
• Current at end of cable: 194 Amps (200A - [.03 ten 200])
• Calculated Voltage Drop: 1000 kcmil aluminum wire: 2.61% - this is inside the iii% limit

  1 conductor per phase utilizing a k kcmil Aluminum conductor installed Directly Buried will limit the voltage drop to two.61% or less when supplying 194 amps for 400.0 feet on a 240 volt 1 phase organization.

3. Example calcuation 2 - Aluminum Wire, 3 Phase power

• Power Factor: 100%
• Wire Size: 750 kcmil Aluminum
• Phase: Three phase
• Conductor: Aluminum
• Installation: Directly cached
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: 3%
• Current at end of cable: 194 Amps (200A - [.03 x 200])
• Calculated Voltage Driblet: 1000 kcmil aluminum wire: 2.64% - this is within the iii% limit

  i conductor per stage utilizing a 750 kcmil Aluminum conductor installed Straight Buried will limit the voltage drop to ii.64% or less when supplying 194 amps for 400.0 feet on a 240 volt 3 phase organisation.

4. Example calcuation 2 - Copper Wire, three Phase power

• Power Gene: 100%
• Wire Size: 750 kcmil Aluminum
• Phase: Iii phase
• Conductor: Aluminum
• Installation: Direct buried
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: three%
• Electric current at finish of cable: 194 Amps (200A - [.03 ten 200])
• Calculated Voltage Drop: 350 kcmil copper wire: 2.89% - this is within the iii% limit

  i conductor per phase utilizing a 750 kcmil Aluminum conductor installed Direct Cached will limit the voltage drib to 2.64% or less when supplying 194 amps for 400.0 feet on a 240 volt iii phase system.

Online voltage driblet calculator used: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Spider web page: https://www.southwire.com/estimator-vdrop

Fundamental points in calculating voltage drop and selecting wiring cable

• 3% is the typical allowable voltage drop for SEC feeder wires
• 5% is the maximum recommended voltage drib for individual branch circuits.
  
• The 200A service is non necessarily the amps used in the voltage drib calculation though we've kept the 200A effigy for these example calculations. The engineer doing a straight voltage drop calculation adds upwards the anticipated current load or wattages for all of the circuits being fed from the panel.

  Total Watts / Excursion Voltage (110 or 220) = Total AMPS [Or more than conservative: use your nominal 200A console and billow rating]

• Watch out: with a 400 foot run your 200A wire size may exist so large that information technology volition not fit in the standard wiring lugs in your 200A panel. Your electrical supplier an provide a wire size reducer that can make the connectedness betwixt a larger diameter SEC wire and the lugs in your electrical panel.
• Spotter out : when running larger service wires you may also need to run a larger service panel grounding conductor to earth.

Reader Comments & Q&A

Actually? yous ran or program to run #10 copper wire ii,500 feet - nearly half a mile of electrical wire. In conduit?

There is simply no style that yous can run a conventional 15A o 20A 120V or fifty-fifty 240V wire using #10/2 copper wire from your home to a barn that'due south most half a mile away using any conventional wiring ways. The wire volition take such a large voltage drib that your commitment voltage will be too low and your pump either won't run or will have constant problem.

Here nosotros discuss using a voltage drop calculator (we similar i provided by Southwire) at which you input the basic parameters of

- cable run length

- voltage

- commanded voltage drop (commonly limited to iii%)

- electric current(amp) required at finish of cable

- number of parallel wire ready

I ran your case for two solutions:

Example 1: 2500 ft., 15Amps, 120VAC, and the wire size calculator returns

1 conductor per stage utilizing a 400 kcmil Copper conductor installed Direct Buried will limit the voltage driblet to 2.95% or less when supplying 15 amps for 2500.0 feet on a 120 volt one phase organisation.

OR

Case 2: 2500 ft., 15Amps, 240VAC, and the wire size calculator returns

1 conductor per phase utilizing a iii/0 AWG Copper conductor installed Direct Buried volition limit the voltage drop to 2.74% or less when supplying 15 amps for 2500.0 feet on a 240 volt 1 phase organization.

Bluntly, if I were going to the problem and cost of running one-half a mile of electrical wire I'd run a 240V line to accept a flake more capacity at the other end -
and I'd consider going to a 20A circuit, for which you lot'd demand

ane conductor per phase utilizing a 250 kcmil Copper usher installed Directly Buried will limit the voltage drop to 2.69% or less when supplying xx amps for 2500.0 anxiety on a 240 volt ane 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 than just a well pump? What about a light, or a receptacle to ability an electric drill?

Shown above is a wire size table adjusted from Encorewire.com cited theron

I'd do some shopping or consider an alternative ability source (Solar ?)

Consider that at some suppliers we checked online (y'all may find better cost from a bulk electric wire supplier)

the cost for 2,500 ft of 3/0 copper electrical wire is over $xi,000. U.Southward.

the price for 2,500 ft. of 400 kcmil copper wire is effectually $30,000 U.Due south.

Thats for using UF-rated wire - intended for direct burial into soil.

If you instead want to effort to run half-a mile of conduit - not something that's necessary in my Opinion, and if you used a 3/4" diameter flexible water-tight non-metallic conduit like that provided by Southwire, shown below, you may salvage by buying individual conductors instead of sheathed UF SEC cable, at $136 / 100 ft., you'll add together virtually some other $3,400. U.S. varying up or down in toll depending on the conduit diameter needed.

This flexible conduit is rated as permittd for directly burying or for burial in concrete. The conduit wall is Schedule-forty.

Also run across conduit products from Hydromaxx.

I have 10/ii UF-B Wire w/ Ground which runs surreptitious with no conduit for 2500 feet from the control box in the barn to the two pressure tanks in my pump firm.

This is the third time it is shorting out and the well person who installed the organisation saids he is not an electrician and unable to recommend what kind of wire I demand to supersede information technology with.
Something most it is bleeding over causing the brusk.

Sending 120 volts upwards the wire and simply receiving 58 volts back = which is called-for the control components upwardly.

What would exist the right kind and size of the wires to tell the pump to turn off.

There is hardly whatsoever load on the wires what would I supercede it with?

Any feedback would be greatly appreciated. 503-663-2244 priano@gmail.com

@Jerry,

When you get to longer lengths than illustrated above on this folio, you need to become to an online voltage drop calculator every bit noted to a higher place, such every bit:
http://www.southwire.com/back up/voltage-drop-calculator.htm

or

http://www.paigewire.com/pumpWireCalc.aspx

The section above:

How to Apply a Voltage Drib Reckoner to Determine Required Service Entry Wire Size

volition help you in using those online calculators.

Using a voltage driblet 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 #two AWG copper wire

3% is the recommended allowable voltage drop

5% is the maximum permitted drop on a typical branch circuit;
If you lot accept v% voltage drib your copper wire could be #4 AWG.

For other readers:

For co-operative circuits at 15A up to 50A and for distances upwardly to 400 ft
you will find our

Branch Circuit Wire Sizes Needed for Longer Run Lengths Tabular array

at SE CABLE & WIRE SIZES vs AMPS

What size/type directly burying cable do I need to provide 15 amps with at the cease of a 650 ft run?

@Bearding,

Please take a wait in the table "Copper SEC Wire Size for Long Runs for 200A Service" at the superlative of this folio.

what size wire for 200amp 140 human foot run hugger-mugger

@Larry, please check the sizing tables in the commodity higher up and let me know if any of that is unclear or disruptive

What size service entrance cable practice 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/electric/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 Underground SERVICE LATERAL FAQs

I'm putting hole-and-corner electrical service to my firm. I take 200 amp service. I need 200 feet of underground. What size wire do I demand.

Bob,

Please bank check 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 echo your question and give a detailed reply.

Permit me know if that information is not clear or if y'all're left with questions.

I'yard running a 400 foot main cable from street to home, I want 200amp service and use aluminum wire. What size exercise I use to compensate for distance

...

Continue reading at SE Cable & BRANCH CIRCUIT WIRE SIZES vs AMPS - topic habitation, or select a topic from the closely-related articles below, or see the complete Commodity Index.

Or see these

Articles on Determination of Ampacity & Voltage at Edifice Electrical Services

• AMPS VOLTS DETERMINATION - home
  • AMPS, LIMITING FACTORS
  • AMPS & SEC SIZES
  • AMPS & VOLTS, Decide VISUALLY
  • AMPS MEASUREMENT AUTOMOTIVE DC
  • AMPS MEASUREMENT METHODS
  • AMPACITY, MAIN DISCONNECT
  • DEFINITIONS AMPS VOLTS WATTS
  • Electric METERS & METER BASES
  • ELECTRIC MOTOR HORSEPOWER & Excursion WIRE SIZE
  • Electric PANEL AMPACITY
  • VOLTAGE at the SEC
  • Hush-hush SERVICE LATERALS - buried Service Entry Cables
• Basis SYSTEM INSPECTION - home
• SAFETY for Electrical INSPECTORS - home
• SE Cable & Co-operative Excursion WIRE SIZES vs AMPS
• SE CABLE & WIRE SIZES FOR LONG RUNS
• SERVICE ENTRY WIRING & AMPACITY - wire sizes
• SIZE of WIRE REQUIRED for ELECTRICAL RECEPTACLES for receptacle circuits and similar wiring situations
• VOLTS / AMPS MEASUREMENT EQUIP

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