What Size Direct Burial Parallel Feeders Are Needed For A 120/240v 3 Phase Service

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

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Electric service entry wire sizes are calculated for long wire runs in which the wire size must be increased to avoid an un-wanted voltage drop. We include links to wire size and voltage drop calculators.

This article series gives photos and tables of electrical service entry cable sizes, electrical branch circuit wire sizes, bong wire, telephone wire, thermostat wire, and ampacity or fuse/circuit billow ratings.

We also provide an ARTICLE Index for this topic, or yous can try the folio top or bottom SEARCH BOX every bit a quick way to find information you demand.

Tables of SEC Sizes for Long Wire Runs for Copper & Aluminum Cable

This page gives the necessary increment in electrical service entry wire size for long runs, for example between the electric meter and the main electrical panel.

If y'all need wire sizes for shorter service entry cables up to 200A or for both brusk and long branch circuit wires from 15 to 50A

encounter SE CABLE & BRANCH CIRCUIT WIRE SIZES vs AMPS

Summary Table of Service Entry Cable Sizes

(Detailed tables follow the tabular array 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 Usher
		25 ft.	50 ft.	100 ft.	150 ft.	200 ft.	300 ft.	400 ft.
Wire Material	AMPS	Wire Size AWG
Copper	100A	4	4	1	ii/0	three/0	300 kcmil	500 kcmil
Aluminum	100A	2	2	ii/0	4/0	300 kcmil	600 kcmil	1000 kcmil
Copper	200A	1/0	1/0	iii/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 kcmiliii

Notes to the table in a higher place

1. Using two 120VAC conductors, <= 3% maximum drop in voltage
2. 240V Service provided as ii separate 120VAC cables; All of these services are unmarried phase. 3 phase power typically reduces the wire size to the next smaller.
3. Requires 2 parallel cable sets
4. Spotter out: these are case wire or cable sizes vs. run or length for the specific parameters named hither and entered in the wire size and length reckoner. Your installation may differ. For safety and for code compliant electrical wiring, be sure to bank check with your local electrical code inspector and electrical lawmaking 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 information is from

   • Cable size recommended based on voltage drib calculations. Calculated by Online voltage drop calculator: 2019/07/23, Southwire, Tel: ane-800-444-1700 Website: world wide web.southwire.com E-mail: CableTechSupport@southwire.com Web folio: https://www.southwire.com/calculator-vdrop

Detailed Copper SEC Sizes for Longer Cable Distances

The table below shows Copper SEC wire sizes for diverse run lengths - be sure to run across the additional 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 Size1	Distance 8 Ft. / M	Voltage Drop %	Phase
3/0 AWG	200 - 225seven / lx	ii.83	i
3/0 AWG	200 / 60	2.45	3
4/0 AWG	250 - 2607 / 75	2.89	ane
4/0 AWG	250 / 75	2.58	3
250 kcmil	2907 / 88
250 kcmil	2907 - 300 / 90	ii.72	iii
300 kcmil	300 - 3207 / ninety	ii.78	1
300 kcmil	350 / 100	2.82	iii
350 kcmil	3507/ 100	two.92	1
350 kcmil	400 / 120	2.89	3
400 kcmil	450 / 135	ii.97	3
500 kcmil	400 - 4307 / 120	ii.67	1
600 kcmil	450 - 4757 / 135	2.74	1
500 kcmil	500 / 150	2.89	iii
600 kcmil	475 / 145		1
750 kcmil	500 - 5357 / 150	2.72	1
1000 kcmil	615vii / 187		ane

Notes to the table above:

1. Cable size recommended based on voltage drop calculations. Calculated past Online voltage drop 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 Panel & Service Size: 200A 240VAC, Ending amps if voltage driblet were 3% will exist 194A
3. Voltage: 240 VAC
4. Maximum Voltage Driblet: iii%
5. Parallels (Sets) 1
6. Usher installation is directly-buried, in conduit, OR overhead, unless otherwise noted
7. See this ELECTRIC 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
8. Maximum wire run distance changes by required temperature rating:

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

   Watch out: Note that dropping to 60°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) upwards through typical residential SEC wire sizes and amps

   See SE CABLE & Branch CIRCUIT WIRE SIZES vs AMPS

Watch out: the engineering piece of work and derivation of the tabular array in a higher place is derived from the sources listed below including manufacturer'due south tables and online voltage driblet calculators but may not be correct for your specific installation. Bank check with your engineer or electrician.

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

Detailed Aluminum SEC Cablevision Sizes for Long Wire Runs

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

Aluminum SEC Wire Size for Long Runs for 200A Service
Cable Size1	Distance Ft. / M	Voltage Drop %	Phase
300 kcmil	200 / lx	2.79	1
250 kcmil	200 / sixty	ii.77	3
400 kcmil	250 / 75	2.85	1
350 kcmil	250 / 75	2.69	iii
500 kcmil	300 / xc	two.92	1
400 kcmil	300 / 90	2.96	3
750 kcmil	350 / 100	2.67	1
500 kcmil	350 / 100	2.95	three
one thousand kcmil	400 / 120	2.61	1
750 kcmil	400 / 120	2.64	3
1000 kcmil	450 / 135	2.94	1
750 kcmil	450 / 135	2.97	3
Non Available	500 / 150		i
grand kcmil	500 / 150	two.83	3

Notes to the table above: Assumptions

1. Cable 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://world wide web.southwire.com/estimator-vdrop
2. Electrical Panel & Service Size: 200A 240VAC, Ending amps if voltage drop were iii% volition be 194A
3. Voltage: 240 VAC
4. Maximum Voltage Drop: 3%
5. Parallels (Sets) 1
6. Conductor installation is directly-buried, in conduit, OR overhead, unless otherwise noted

Watch out: if you are non trained and qualified to install electrical wiring a error can event in fire, injury, or death. Be sure you review your work programme with your local electric inspector and that piece of work is done to the electrical lawmaking for the land and city where you lot live. In the U.S. that's the U.S. NEC.

How to Apply a Voltage Drib Calculator to Determine Reqired Service Entry Wire Size

Here nosotros give examples and compare the results of using ii example wire size and voltage drib calculators.

You volition encounter that Southwire and Paige calculators requite similar results.

1. Southwire'southward Voltage Driblet Estimator example calculating SEC wire size

Southwire's wire size figurer at http://world wide web.southwire.com/support/voltage-drop-computer.htm is easy to use and clear.

The user specifies the number of phases (1 or 3), conductor (copper or aluminum), installation (straight buried, conduit, or overhead) and the input voltage, maximum allowed voltage drop (I utilize 3%), the length of the cable run, and the desired current (amps) at the end of the cable run. The calculator gives an appropriate wire choice and its parameters, such every bit this:

Example: Unmarried phase, aluminum conductor, direct buried, 120VAC, iii% maximum voltage drib, 250 ft. cable run length, 100A electric current at end of cable

Result: 1 conductors per phase utilizing a #400 Aluminum conductor will limit the voltage drop to 2.94% or less when supplying 100.0 amps for 250 feet on a 120 volt system.

Changing the example to a higher place to 240 VAC, keeping other parameters the same gives this consequence:

Result: i conductors per stage utilizing a #three/0 Aluminum conductor 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 case calculating SEC wire size

Paige Wire's voltage wire size calcuator at http://www.paigewire.com/pumpWireCalc.aspx is besides easy to use and clear. Testing with the post-obit parameters:

Example: 240 VAC Unmarried Stage, 100A, 250 ft. run, three% voltage drop immune,

Result: 1 AWG Copper or 2/0 Aluminum

Changing the example above to 120VAC, keeping other parameters the same gives this result:

Outcome: 3/0 AWG Copper or 250 MCM Aluminum

Siemens offers an XLS spreadsheet [ http://w3.usa.siemens.com/united states/net-dms/net/consultingengineerscomm/general/Docs/DA_VD_Calculator_V1.1.xls - this accost leaves InspectApedia.com] that can be used to calculate voltage dropas do other sources, and there are numerous online voltage driblet calculators - I like the Southwire calculator given above. Be certain to compare the figurer's result with what the applicable electric code volition allow.

Voltage Drop Alphabetize - 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 electrical resistance of a wire and is calculated as

VDI = (Amps x Feet of run) / (% Voltage Drib immune x Voltage)

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

3% is the most commonly-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 Cablevision practise I need for a 200A panel on a 400 human foot length?

2019/07/23 Bob s. said:

I'm running a 400 foot chief cable from street to home, I want 200amp service and use aluminum wire. What size do I use to compensate for altitude

Reply:

From the table of Aluminm SEC Cablevision Sizes for Long Runs y'all'll see the answers given beneath,

Answer: 200A, Aluminum wire, 400 human foot run, direct cached SEC cable

For single phase power: chiliad kcmil aluminum wire will have a voltage drop under 3% fora 400 foot run of direct cached cable and a 200VAC unmarried phase electrical service. That gives u.s. 194 Amps at the end of the SEC run.

For three phase ability: 750 kcmil aluminum wire will have a voltage drib nether iii% for a 400 foot run of direct cached cablevision and a 200VAC iii phase electric service. That gives us 194 Amps at the finish of the SEC run.

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

Details nearly Wire Size vs Voltage Drop for Long SEC Wire Runs

Voltage drib across a wire is proportional to the electric current flow and wire resistance; for AC power such every bit your service entry cable (SEC) total impedance and ability factor (the ratio of power loss) are considered too.

None of the standard voltage driblet tables become beyond 200 feet 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 drib adding and wire size. Or use ane of the online voltage drop calculators. Southwire provides an piece of cake-to-utilize voltage drop calculator that I recommend. .

I expect you're going to end upwardly with at least 600 or 750 MCM AL wire - such a large size may non be practical fifty-fifty though the Cu will of course be more expensive. Let's look at the details.

1. Case calculation 1 - Copper Wire, one phase power

• Ability Factor: 100%
• Wire Size: 500 kcmil Copper
• Phase: Single phase
• Usher: Aluminum
• Installation: Directly buried
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: iii%
• Current at end of cablevision: 194 Amps (200A - [.03 ten 200])
• Calculated Voltage Driblet: with 500 kcmil copper wire: two.67% - this is inside the 3% limit

  one conductor per phase utilizing a 500 kcmil Copper conductor installed Direct Cached will limit the voltage drop to 2.67% or less when supplying 194 amps for 400.0 feet on a 240 volt 1 phase organisation.

2. Instance calcuation 2 - Aluminum Wire, 1 phase ability

• Ability Factor: 100%
• Wire Size: 1000 kcmil Aluminum
• Stage: Single phase
• Conductor: Aluminum
• Installation: Direct buried
• Voltage: 240VAC
• Cablevision run: 400 ft.
• Maximum voltage drop: 3%
• Current at cease of cable: 194 Amps (200A - [.03 ten 200])
• Calculated Voltage Drop: 1000 kcmil aluminum wire: 2.61% - this is within the iii% limit

  1 conductor per phase utilizing a 1000 kcmil Aluminum conductor installed Direct 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.

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

• Ability Gene: 100%
• Wire Size: 750 kcmil Aluminum
• Phase: Three stage
• Conductor: Aluminum
• Installation: Direct buried
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage drop: three%
• Current at cease of cablevision: 194 Amps (200A - [.03 x 200])
• Calculated Voltage Drop: thou kcmil aluminum wire: 2.64% - this is inside the three% limit

  1 conductor per stage utilizing a 750 kcmil Aluminum conductor installed Direct Buried volition limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 feet on a 240 volt iii phase system.

4. Example calcuation 2 - Copper Wire, iii Phase ability

• Power Factor: 100%
• Wire Size: 750 kcmil Aluminum
• Phase: 3 phase
• Conductor: Aluminum
• Installation: Direct buried
• Voltage: 240VAC
• Cable run: 400 ft.
• Maximum voltage driblet: 3%
• Current at terminate of cable: 194 Amps (200A - [.03 10 200])
• Calculated Voltage Drop: 350 kcmil copper wire: 2.89% - this is within the 3% limit

  i conductor per phase utilizing a 750 kcmil Aluminum usher installed Direct Buried will limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 feet on a 240 volt 3 phase organisation.

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

Key points in calculating voltage drop and selecting wiring cable

• three% is the typical allowable voltage drib for SEC feeder wires
• 5% is the maximum recommended voltage drop for individual 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 example calculations. The engineer doing a direct voltage drop calculation adds upwards the predictable current load or wattages for all of the circuits beingness fed from the panel.

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

• Watch out: with a 400 human foot run your 200A wire size may be and then big that information technology will non fit in the standard wiring lugs in your 200A panel. Your electric supplier an provide a wire size reducer that can brand the connection between a larger bore SEC wire and the lugs in your electrical panel.
• Scout out : when running larger service wires you lot may also demand to run a larger service panel grounding conductor to earth.

Reader Comments & Q&A

Really? you lot ran or programme to run #ten copper wire 2,500 anxiety - near half a mile of electrical wire. In conduit?

In that location is simply no way that y'all can run a conventional 15A o 20A 120V or fifty-fifty 240V wire using #10/ii copper wire from your home to a befouled that's nigh half a mile abroad using any conventional wiring ways. The wire volition have such a large voltage drib that your delivery voltage will exist too low and your pump either won't run or will take constant trouble.

Here we discuss using a voltage drop calculator (we like 1 provided past Southwire) at which you input the basic parameters of

- cable run length

- voltage

- allowable voltage drop (normally limited to 3%)

- current(amp) required at terminate of cable

- number of parallel wire prepare

I ran your example for two solutions:

Instance ane: 2500 ft., 15Amps, 120VAC, and the wire size estimator returns

1 conductor per phase utilizing a 400 kcmil Copper usher installed Directly Buried will limit the voltage drop to 2.95% or less when supplying fifteen amps for 2500.0 feet on a 120 volt one stage system.

OR

Case ii: 2500 ft., 15Amps, 240VAC, and the wire size computer returns

1 conductor per stage utilizing a 3/0 AWG Copper conductor installed Direct Cached volition limit the voltage drop to two.74% or less when supplying 15 amps for 2500.0 anxiety on a 240 volt 1 phase system.

Bluntly, if I were going to the problem and cost of running half a mile of electric wire I'd run a 240V line to accept a flake more than capacity at the other finish -
and I'd consider going to a 20A circuit, for which yous'd need

1 conductor per phase utilizing a 250 kcmil Copper usher installed Directly Cached will limit the voltage driblet to 2.69% or less when supplying xx 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 edifice nobody is going to desire to run more than only a well pump? What virtually a light, or a receptacle to power an electric drill?

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

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

Consider that at some suppliers we checked online (you may find better toll from a majority electrical wire supplier)

the toll for 2,500 ft of 3/0 copper electrical wire is over $11,000. U.S.

the price for two,500 ft. of 400 kcmil copper wire is around $30,000 U.S.

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

If you lot instead want to endeavor to run half-a mile of conduit - not something that'southward necessary in my OPINION, and if you lot used a 3/4" diameter flexible water-tight non-metallic conduit similar that provided past Southwire, shown below, you may relieve by buying private conductors instead of sheathed UF SEC cable, at $136 / 100 ft., you'll add almost another $3,400. U.S. varying up or downwardly in cost depending on the conduit bore needed.

This flexible conduit is rated every bit permittd for straight burial or for burial in physical. The conduit wall is Schedule-xl.

Too see conduit products from Hydromaxx.

I take x/two UF-B Wire w/ Ground which runs underground with no conduit for 2500 feet from the control box in the befouled to the 2 pressure tanks in my pump house.

This is the third 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 demand to replace information technology with.
Something well-nigh it is bleeding over causing the short.

Sending 120 volts up the wire and just receiving 58 volts back = which is burning the control components up.

What would be the correct kind and size of the wires to tell the pump to turn off.

In that location is hardly whatever load on the wires what would I supercede it with?

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

@Jerry,

When y'all get to longer lengths than illustrated above on this folio, you lot need to get to an online voltage driblet computer as noted higher up, such as:
http://www.southwire.com/support/voltage-drib-calculator.htm

or

http://world wide web.paigewire.com/pumpWireCalc.aspx

The section above:

How to Use a Voltage Drop Calculator to Decide Required Service Entry Wire Size

volition aid y'all in using those online calculators.

Using a voltage drop calculator as we suggested, you lot'll run across that if you allow a three% voltage drop your copper wire size for a 15A excursion 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 accept 5% voltage drop your copper wire could be #4 AWG.

For other readers:

For branch circuits at 15A upwards to 50A and for distances up to 400 ft
you will detect our

Co-operative Circuit Wire Sizes Needed for Longer Run Lengths Table

at SE CABLE & WIRE SIZES vs AMPS

What size/type direct burial cable do I need to provide 15 amps with at the terminate of a 650 ft run?

@Anonymous,

Delight accept a look in the table "Copper SEC Wire Size for Long Runs for 200A Service" at the superlative of this page.

what size wire for 200amp 140 pes run hugger-mugger

@Larry, please check the sizing tables in the article above and let me know if any of that is unclear or confusing

What size service archway cable do I demand for a 100 amp service and a 150 ft. run?

Tim

Bank check out

SE CABLE SIZES FOR LONG WIRE RUNS

at https://inspectapedia.com/electric/Long-Run-SEC-Cablevision-Sizes.php

and don't hesitate to ask if that leaves yous with questions

Thanks This Q&A were posted originally at Cloak-and-dagger SERVICE LATERAL FAQs

I'yard putting cloak-and-dagger electric service to my firm. I take 200 amp service. I need 200 anxiety of underground. What size wire do I need.

Bob,

Please check out the table 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 requite a detailed reply.

Permit me know if that data is not clear or if you're left with questions.

I'm running a 400 foot primary cable from street to home, I want 200amp service and use aluminum wire. What size practice I use to compensate for altitude

...

Continue reading at SE Cable & BRANCH Excursion WIRE SIZES vs AMPS - topic home, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see these

Articles on Determination of Ampacity & Voltage at Building Electrical Services

• AMPS VOLTS Determination - home
  • AMPS, LIMITING FACTORS
  • AMPS & SEC SIZES
  • AMPS & VOLTS, Determine VISUALLY
  • AMPS MEASUREMENT AUTOMOTIVE DC
  • AMPS MEASUREMENT METHODS
  • AMPACITY, Principal DISCONNECT
  • DEFINITIONS AMPS VOLTS WATTS
  • ELECTRIC METERS & METER BASES
  • Electrical MOTOR HORSEPOWER & Circuit WIRE SIZE
  • Electrical PANEL AMPACITY
  • VOLTAGE at the SEC
  • Cloak-and-dagger SERVICE LATERALS - cached Service Entry Cables
• GROUND SYSTEM INSPECTION - dwelling
• Condom for ELECTRICAL INSPECTORS - home
• SE Cablevision & Branch CIRCUIT 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 like wiring situations
• VOLTS / AMPS MEASUREMENT EQUIP

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